The second data release of the sloan digital sky survey

Kevork Abazajian; Jennifer K. Adelman-McCarthy; Marcel A. Agüeros; Sahar S. Allam; S. J Anderson Kurt; Scott F. Anderson; James Annis; Neta A. Bahcall; Ivan K. Baldry; Steven Bastian; Andreas Berlind; Mariangela Bernardi; Michael R. Blanton; John J. Bochanski; William N. Boroski; John W. Briggs; J. Brinkmann; Robert J. Brunner; Tamás Budavári; Larry N. Carey; Samuel Carliles; Francisco J. Castander; A. J. Connolly; István Csabai; Mamoru Doi; Feng Dong; Daniel J. Eisenstein; Michael L. Evans; Xiaohui Fan; Douglas P. Finkbeiner; Scott D. Friedman; Joshua A. Frieman; Masataka Fukugita; Roy R. Gal; Bruce Gillespie; Karl Glazebrook; Jim Gray; Eva K. Grebel; James E. Gunn; Vijay K. Gurbani; Patrick B. Hall; Masaru Hamabe; Frederick H. Harris; Hugh C. Harris; Michael Harvanek; Timothy M. Heckman; John S. Hendry; Gregory S. Hennessy; Robert B. Hindsley; Craig J. Hogan; David W. Hogg; Donald J. Holmgren; Shin ichi Ichikawa; Takashi Ichikawa; Željko Ivezić; Sebastian Jester; David E. Johnston; Anders M. Jorgensen; Stephen M. Kent; S. J. Kleinman; G. R. Knapp; Alexei Y. Kniazev; Richard G. Kron; Jurek Krzesinski; Peter Z. Kunszt; Nickolai Kuropatkin; Donald Q. Lamb; Hubert Lampeitl; Brian C. Lee; R. French Leger; Nolan Li; Huan Lin; Yeong Shang Loh; Daniel C. Long; Jon Loveday; Robert H. Lupton; Tanu Malik; Bruce Margon; Takahiko Matsubara; Peregrine M. McGehee; Timothy A. McKay; Avery Meiksin; Jeffrey A. Munn; Reiko Nakajima; Thomas Nash; Eric H. Neilsen; Heidi J. Newberg; Peter R. Newman; Robert C. Nichol; Tom Nicinski; Maria Nieto-Santisteban; Atsuko Nitta; Sadanori Okamura; William O'Mullane; Jeremiah P. Ostriker; Russell Owen; Nikhil Padmanabhan; John Peoples; Jeffrey R. Pier; Adrian C. Pope; Thomas R. Quinn; Gordon T. Richards; Michael W. Richmond; Walter Hans-Rix; Constance M. Rockosi; David J. Schlegel; Donald P. Schneider; Ryan Scranton; Maki Sekiguchi; Uros Seljak; Gary Sergey; Branimir Sesar; Erin Sheldon; Kazu Shimasaku; Walter A. Siegmund; Nicole M. Silvestri; J. Allyn Smith; Vernesa Smolčić; Stephanie A. Snedden; Albert Stebbins; Chris Stoughton; Michael A. Strauss; Mark Rao Subba; Alexander S. Szalay; István Szapudi; Paula Szkody; Gyula P. Szokoly; Max Tegmark; Luis Teodoro; Aniruddha R. Thakar; Christy Tremonti; Douglas L. Tucker; Alan Uomoto; Daniel E. vanden Berk; Jan Vandenberg; Michael S. Vogeley; Wolfgang Voges; Nicole P. Vogt; Lucianne M. Walkowicz; Shu i. Wang; David H. Weinberg; Andrew A. West; Simon D M White; Brian C. Wilhite; Yongzhong Xu; Brian Yanny; Naoki Yasuda; Ching Wa Yip; D. R. Yocum; Donald G. York; Idit Zehavi; Stefano Zibetti; Daniel B. Zucker

doi:10.1086/421365

The second data release of the sloan digital sky survey

Kevork Abazajian^*, Jennifer K. Adelman-McCarthy, Marcel A. Agüeros, Sahar S. Allam, S. J Anderson Kurt, Scott F. Anderson, James Annis, Neta A. Bahcall, Ivan K. Baldry, Steven Bastian, Andreas Berlind, Mariangela Bernardi, Michael R. Blanton, John J. Bochanski, William N. Boroski, John W. Briggs, J. Brinkmann, Robert J. Brunner, Tamás Budavári, Larry N. CareySamuel Carliles, Francisco J. Castander, A. J. Connolly, István Csabai, Mamoru Doi, Feng Dong, Daniel J. Eisenstein, Michael L. Evans, Xiaohui Fan, Douglas P. Finkbeiner, Scott D. Friedman, Joshua A. Frieman, Masataka Fukugita, Roy R. Gal, Bruce Gillespie, Karl Glazebrook, Jim Gray, Eva K. Grebel, James E. Gunn, Vijay K. Gurbani, Patrick B. Hall, Masaru Hamabe, Frederick H. Harris, Hugh C. Harris, Michael Harvanek, Timothy M. Heckman, John S. Hendry, Gregory S. Hennessy, Robert B. Hindsley, Craig J. Hogan, David W. Hogg, Donald J. Holmgren, Shin ichi Ichikawa, Takashi Ichikawa, Željko Ivezić, Sebastian Jester, David E. Johnston, Anders M. Jorgensen, Stephen M. Kent, S. J. Kleinman, G. R. Knapp, Alexei Y. Kniazev, Richard G. Kron, Jurek Krzesinski, Peter Z. Kunszt, Nickolai Kuropatkin, Donald Q. Lamb, Hubert Lampeitl, Brian C. Lee, R. French Leger, Nolan Li, Huan Lin, Yeong Shang Loh, Daniel C. Long, Jon Loveday, Robert H. Lupton, Tanu Malik, Bruce Margon, Takahiko Matsubara, Peregrine M. McGehee, Timothy A. McKay, Avery Meiksin, Jeffrey A. Munn, Reiko Nakajima, Thomas Nash, Eric H. Neilsen, Heidi J. Newberg, Peter R. Newman, Robert C. Nichol, Tom Nicinski, Maria Nieto-Santisteban, Atsuko Nitta, Sadanori Okamura, William O'Mullane, Jeremiah P. Ostriker, Russell Owen, Nikhil Padmanabhan, John Peoples, Jeffrey R. Pier, Adrian C. Pope, Thomas R. Quinn, Gordon T. Richards, Michael W. Richmond, Walter Hans-Rix, Constance M. Rockosi, David J. Schlegel, Donald P. Schneider, Ryan Scranton, Maki Sekiguchi, Uros Seljak, Gary Sergey, Branimir Sesar, Erin Sheldon, Kazu Shimasaku, Walter A. Siegmund, Nicole M. Silvestri, J. Allyn Smith, Vernesa Smolčić, Stephanie A. Snedden, Albert Stebbins, Chris Stoughton, Michael A. Strauss, Mark Rao Subba, Alexander S. Szalay, István Szapudi, Paula Szkody, Gyula P. Szokoly, Max Tegmark, Luis Teodoro, Aniruddha R. Thakar, Christy Tremonti, Douglas L. Tucker, Alan Uomoto, Daniel E. vanden Berk, Jan Vandenberg, Michael S. Vogeley, Wolfgang Voges, Nicole P. Vogt, Lucianne M. Walkowicz, Shu i. Wang, David H. Weinberg, Andrew A. West, Simon D M White, Brian C. Wilhite, Yongzhong Xu, Brian Yanny, Naoki Yasuda, Ching Wa Yip, D. R. Yocum, Donald G. York, Idit Zehavi, Stefano Zibetti, Daniel B. Zucker

^*Corresponding author for this work

Research output: Contribution to journal › Review article › peer-review

933 Citations (Scopus)

Abstract

The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its Second Data Release. This data release consists of 3324 deg ² of five-band (ugriz) imaging data with photometry for over 88 million unique objects, 367,360 spectra of galaxies, quasars, stars, and calibrating blank sky patches selected over 2627 deg² of this area, and tables of measured parameters from these data. The imaging data reach a depth of r ≈ 22.2 (95% completeness limit for point sources) and are photometrically and astrometrically calibrated to 2% rms and 100 mas rms per coordinate, respectively. The imaging data have all been processed through a new version of the SDSS imaging pipeline, in which the most important improvement since the last data release is fixing an error in the model fits to each object. The result is that model magnitudes are now a good proxy for point-spread function magnitudes for point sources, and Petrosian magnitudes for extended sources. The spectroscopy extends from 3800 to 9200 Å at a resolution of 2000. The spectroscopic software now repairs a systematic error in the radial velocities of certain types of stars and has substantially improved spectrophotometry. All data included in the SDSS Early Data Release and First Data Release are reprocessed with the improved pipelines and included in the Second Data Release. Further characteristics of the data are described, as are the data products themselves and the tools for accessing them.

Original language	English
Pages (from-to)	502-512
Number of pages	11
Journal	Astronomical Journal
Volume	128
Issue number	1 1783
DOIs	https://doi.org/10.1086/421365
Publication status	Published - Jul 2004
Externally published	Yes

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10.1086/421365

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Abazajian, K., Adelman-McCarthy, J. K., Agüeros, M. A., Allam, S. S., Kurt, S. J. A., Anderson, S. F., Annis, J., Bahcall, N. A., Baldry, I. K., Bastian, S., Berlind, A., Bernardi, M., Blanton, M. R., Bochanski, J. J., Boroski, W. N., Briggs, J. W., Brinkmann, J., Brunner, R. J., Budavári, T., ... Zucker, D. B. (2004). The second data release of the sloan digital sky survey. Astronomical Journal, 128(1 1783), 502-512. https://doi.org/10.1086/421365

@article{00fd551a8e164e79a6e6a0eef87434e8,

title = "The second data release of the sloan digital sky survey",

abstract = "The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its Second Data Release. This data release consists of 3324 deg 2 of five-band (ugriz) imaging data with photometry for over 88 million unique objects, 367,360 spectra of galaxies, quasars, stars, and calibrating blank sky patches selected over 2627 deg2 of this area, and tables of measured parameters from these data. The imaging data reach a depth of r ≈ 22.2 (95% completeness limit for point sources) and are photometrically and astrometrically calibrated to 2% rms and 100 mas rms per coordinate, respectively. The imaging data have all been processed through a new version of the SDSS imaging pipeline, in which the most important improvement since the last data release is fixing an error in the model fits to each object. The result is that model magnitudes are now a good proxy for point-spread function magnitudes for point sources, and Petrosian magnitudes for extended sources. The spectroscopy extends from 3800 to 9200 {\AA} at a resolution of 2000. The spectroscopic software now repairs a systematic error in the radial velocities of certain types of stars and has substantially improved spectrophotometry. All data included in the SDSS Early Data Release and First Data Release are reprocessed with the improved pipelines and included in the Second Data Release. Further characteristics of the data are described, as are the data products themselves and the tools for accessing them.",

author = "Kevork Abazajian and Adelman-McCarthy, {Jennifer K.} and Ag{\"u}eros, {Marcel A.} and Allam, {Sahar S.} and Kurt, {S. J Anderson} and Anderson, {Scott F.} and James Annis and Bahcall, {Neta A.} and Baldry, {Ivan K.} and Steven Bastian and Andreas Berlind and Mariangela Bernardi and Blanton, {Michael R.} and Bochanski, {John J.} and Boroski, {William N.} and Briggs, {John W.} and J. Brinkmann and Brunner, {Robert J.} and Tam{\'a}s Budav{\'a}ri and Carey, {Larry N.} and Samuel Carliles and Castander, {Francisco J.} and Connolly, {A. J.} and Istv{\'a}n Csabai and Mamoru Doi and Feng Dong and Eisenstein, {Daniel J.} and Evans, {Michael L.} and Xiaohui Fan and Finkbeiner, {Douglas P.} and Friedman, {Scott D.} and Frieman, {Joshua A.} and Masataka Fukugita and Gal, {Roy R.} and Bruce Gillespie and Karl Glazebrook and Jim Gray and Grebel, {Eva K.} and Gunn, {James E.} and Gurbani, {Vijay K.} and Hall, {Patrick B.} and Masaru Hamabe and Harris, {Frederick H.} and Harris, {Hugh C.} and Michael Harvanek and Heckman, {Timothy M.} and Hendry, {John S.} and Hennessy, {Gregory S.} and Hindsley, {Robert B.} and Hogan, {Craig J.} and Hogg, {David W.} and Holmgren, {Donald J.} and Ichikawa, {Shin ichi} and Takashi Ichikawa and {\v Z}eljko Ivezi{\'c} and Sebastian Jester and Johnston, {David E.} and Jorgensen, {Anders M.} and Kent, {Stephen M.} and Kleinman, {S. J.} and Knapp, {G. R.} and Kniazev, {Alexei Y.} and Kron, {Richard G.} and Jurek Krzesinski and Kunszt, {Peter Z.} and Nickolai Kuropatkin and Lamb, {Donald Q.} and Hubert Lampeitl and Lee, {Brian C.} and Leger, {R. French} and Nolan Li and Huan Lin and Loh, {Yeong Shang} and Long, {Daniel C.} and Jon Loveday and Lupton, {Robert H.} and Tanu Malik and Bruce Margon and Takahiko Matsubara and McGehee, {Peregrine M.} and McKay, {Timothy A.} and Avery Meiksin and Munn, {Jeffrey A.} and Reiko Nakajima and Thomas Nash and Neilsen, {Eric H.} and Newberg, {Heidi J.} and Newman, {Peter R.} and Nichol, {Robert C.} and Tom Nicinski and Maria Nieto-Santisteban and Atsuko Nitta and Sadanori Okamura and William O'Mullane and Ostriker, {Jeremiah P.} and Russell Owen and Nikhil Padmanabhan and John Peoples and Pier, {Jeffrey R.} and Pope, {Adrian C.} and Quinn, {Thomas R.} and Richards, {Gordon T.} and Richmond, {Michael W.} and Walter Hans-Rix and Rockosi, {Constance M.} and Schlegel, {David J.} and Schneider, {Donald P.} and Ryan Scranton and Maki Sekiguchi and Uros Seljak and Gary Sergey and Branimir Sesar and Erin Sheldon and Kazu Shimasaku and Siegmund, {Walter A.} and Silvestri, {Nicole M.} and Smith, {J. Allyn} and Vernesa Smol{\v c}i{\'c} and Snedden, {Stephanie A.} and Albert Stebbins and Chris Stoughton and Strauss, {Michael A.} and Subba, {Mark Rao} and Szalay, {Alexander S.} and Istv{\'a}n Szapudi and Paula Szkody and Szokoly, {Gyula P.} and Max Tegmark and Luis Teodoro and Thakar, {Aniruddha R.} and Christy Tremonti and Tucker, {Douglas L.} and Alan Uomoto and {vanden Berk}, {Daniel E.} and Jan Vandenberg and Vogeley, {Michael S.} and Wolfgang Voges and Vogt, {Nicole P.} and Walkowicz, {Lucianne M.} and Wang, {Shu i.} and Weinberg, {David H.} and West, {Andrew A.} and White, {Simon D M} and Wilhite, {Brian C.} and Yongzhong Xu and Brian Yanny and Naoki Yasuda and Yip, {Ching Wa} and Yocum, {D. R.} and York, {Donald G.} and Idit Zehavi and Stefano Zibetti and Zucker, {Daniel B.}",

year = "2004",

month = jul,

doi = "10.1086/421365",

language = "English",

volume = "128",

pages = "502--512",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "Institute of Physics",

number = "1 1783",

}

Abazajian, K, Adelman-McCarthy, JK, Agüeros, MA, Allam, SS, Kurt, SJA, Anderson, SF, Annis, J, Bahcall, NA, Baldry, IK, Bastian, S, Berlind, A, Bernardi, M, Blanton, MR, Bochanski, JJ, Boroski, WN, Briggs, JW, Brinkmann, J, Brunner, RJ, Budavári, T, Carey, LN, Carliles, S, Castander, FJ, Connolly, AJ, Csabai, I, Doi, M, Dong, F, Eisenstein, DJ, Evans, ML, Fan, X, Finkbeiner, DP, Friedman, SD, Frieman, JA, Fukugita, M, Gal, RR, Gillespie, B, Glazebrook, K, Gray, J, Grebel, EK, Gunn, JE, Gurbani, VK, Hall, PB, Hamabe, M, Harris, FH, Harris, HC, Harvanek, M, Heckman, TM, Hendry, JS, Hennessy, GS, Hindsley, RB, Hogan, CJ, Hogg, DW, Holmgren, DJ, Ichikawa, SI, Ichikawa, T, Ivezić, Ž, Jester, S, Johnston, DE, Jorgensen, AM, Kent, SM, Kleinman, SJ, Knapp, GR, Kniazev, AY, Kron, RG, Krzesinski, J, Kunszt, PZ, Kuropatkin, N, Lamb, DQ, Lampeitl, H, Lee, BC, Leger, RF, Li, N, Lin, H, Loh, YS, Long, DC, Loveday, J, Lupton, RH, Malik, T, Margon, B, Matsubara, T, McGehee, PM, McKay, TA, Meiksin, A, Munn, JA, Nakajima, R, Nash, T, Neilsen, EH, Newberg, HJ, Newman, PR, Nichol, RC, Nicinski, T, Nieto-Santisteban, M, Nitta, A, Okamura, S, O'Mullane, W, Ostriker, JP, Owen, R, Padmanabhan, N, Peoples, J, Pier, JR, Pope, AC, Quinn, TR, Richards, GT, Richmond, MW, Hans-Rix, W, Rockosi, CM, Schlegel, DJ, Schneider, DP, Scranton, R, Sekiguchi, M, Seljak, U, Sergey, G, Sesar, B, Sheldon, E, Shimasaku, K, Siegmund, WA, Silvestri, NM, Smith, JA, Smolčić, V, Snedden, SA, Stebbins, A, Stoughton, C, Strauss, MA, Subba, MR, Szalay, AS, Szapudi, I, Szkody, P, Szokoly, GP, Tegmark, M, Teodoro, L, Thakar, AR, Tremonti, C, Tucker, DL, Uomoto, A, vanden Berk, DE, Vandenberg, J, Vogeley, MS, Voges, W, Vogt, NP, Walkowicz, LM, Wang, SI, Weinberg, DH, West, AA, White, SDM, Wilhite, BC, Xu, Y, Yanny, B, Yasuda, N, Yip, CW, Yocum, DR, York, DG, Zehavi, I, Zibetti, S & Zucker, DB 2004, 'The second data release of the sloan digital sky survey', Astronomical Journal, vol. 128, no. 1 1783, pp. 502-512. https://doi.org/10.1086/421365

TY - JOUR

T1 - The second data release of the sloan digital sky survey

AU - Abazajian, Kevork

AU - Adelman-McCarthy, Jennifer K.

AU - Agüeros, Marcel A.

AU - Allam, Sahar S.

AU - Kurt, S. J Anderson

AU - Anderson, Scott F.

AU - Annis, James

AU - Bahcall, Neta A.

AU - Baldry, Ivan K.

AU - Bastian, Steven

AU - Berlind, Andreas

AU - Bernardi, Mariangela

AU - Blanton, Michael R.

AU - Bochanski, John J.

AU - Boroski, William N.

AU - Briggs, John W.

AU - Brinkmann, J.

AU - Brunner, Robert J.

AU - Budavári, Tamás

AU - Carey, Larry N.

AU - Carliles, Samuel

AU - Castander, Francisco J.

AU - Connolly, A. J.

AU - Csabai, István

AU - Doi, Mamoru

AU - Dong, Feng

AU - Eisenstein, Daniel J.

AU - Evans, Michael L.

AU - Fan, Xiaohui

AU - Finkbeiner, Douglas P.

AU - Friedman, Scott D.

AU - Frieman, Joshua A.

AU - Fukugita, Masataka

AU - Gal, Roy R.

AU - Gillespie, Bruce

AU - Glazebrook, Karl

AU - Gray, Jim

AU - Grebel, Eva K.

AU - Gunn, James E.

AU - Gurbani, Vijay K.

AU - Hall, Patrick B.

AU - Hamabe, Masaru

AU - Harris, Frederick H.

AU - Harris, Hugh C.

AU - Harvanek, Michael

AU - Heckman, Timothy M.

AU - Hendry, John S.

AU - Hennessy, Gregory S.

AU - Hindsley, Robert B.

AU - Hogan, Craig J.

AU - Hogg, David W.

AU - Holmgren, Donald J.

AU - Ichikawa, Shin ichi

AU - Ichikawa, Takashi

AU - Ivezić, Željko

AU - Jester, Sebastian

AU - Johnston, David E.

AU - Jorgensen, Anders M.

AU - Kent, Stephen M.

AU - Kleinman, S. J.

AU - Knapp, G. R.

AU - Kniazev, Alexei Y.

AU - Kron, Richard G.

AU - Krzesinski, Jurek

AU - Kunszt, Peter Z.

AU - Kuropatkin, Nickolai

AU - Lamb, Donald Q.

AU - Lampeitl, Hubert

AU - Lee, Brian C.

AU - Leger, R. French

AU - Li, Nolan

AU - Lin, Huan

AU - Loh, Yeong Shang

AU - Long, Daniel C.

AU - Loveday, Jon

AU - Lupton, Robert H.

AU - Malik, Tanu

AU - Margon, Bruce

AU - Matsubara, Takahiko

AU - McGehee, Peregrine M.

AU - McKay, Timothy A.

AU - Meiksin, Avery

AU - Munn, Jeffrey A.

AU - Nakajima, Reiko

AU - Nash, Thomas

AU - Neilsen, Eric H.

AU - Newberg, Heidi J.

AU - Newman, Peter R.

AU - Nichol, Robert C.

AU - Nicinski, Tom

AU - Nieto-Santisteban, Maria

AU - Nitta, Atsuko

AU - Okamura, Sadanori

AU - O'Mullane, William

AU - Ostriker, Jeremiah P.

AU - Owen, Russell

AU - Padmanabhan, Nikhil

AU - Peoples, John

AU - Pier, Jeffrey R.

AU - Pope, Adrian C.

AU - Quinn, Thomas R.

AU - Richards, Gordon T.

AU - Richmond, Michael W.

AU - Hans-Rix, Walter

AU - Rockosi, Constance M.

AU - Schlegel, David J.

AU - Schneider, Donald P.

AU - Scranton, Ryan

AU - Sekiguchi, Maki

AU - Seljak, Uros

AU - Sergey, Gary

AU - Sesar, Branimir

AU - Sheldon, Erin

AU - Shimasaku, Kazu

AU - Siegmund, Walter A.

AU - Silvestri, Nicole M.

AU - Smith, J. Allyn

AU - Smolčić, Vernesa

AU - Snedden, Stephanie A.

AU - Stebbins, Albert

AU - Stoughton, Chris

AU - Strauss, Michael A.

AU - Subba, Mark Rao

AU - Szalay, Alexander S.

AU - Szapudi, István

AU - Szkody, Paula

AU - Szokoly, Gyula P.

AU - Tegmark, Max

AU - Teodoro, Luis

AU - Thakar, Aniruddha R.

AU - Tremonti, Christy

AU - Tucker, Douglas L.

AU - Uomoto, Alan

AU - vanden Berk, Daniel E.

AU - Vandenberg, Jan

AU - Vogeley, Michael S.

AU - Voges, Wolfgang

AU - Vogt, Nicole P.

AU - Walkowicz, Lucianne M.

AU - Wang, Shu i.

AU - Weinberg, David H.

AU - West, Andrew A.

AU - White, Simon D M

AU - Wilhite, Brian C.

AU - Xu, Yongzhong

AU - Yanny, Brian

AU - Yasuda, Naoki

AU - Yip, Ching Wa

AU - Yocum, D. R.

AU - York, Donald G.

AU - Zehavi, Idit

AU - Zibetti, Stefano

AU - Zucker, Daniel B.

PY - 2004/7

Y1 - 2004/7

N2 - The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its Second Data Release. This data release consists of 3324 deg 2 of five-band (ugriz) imaging data with photometry for over 88 million unique objects, 367,360 spectra of galaxies, quasars, stars, and calibrating blank sky patches selected over 2627 deg2 of this area, and tables of measured parameters from these data. The imaging data reach a depth of r ≈ 22.2 (95% completeness limit for point sources) and are photometrically and astrometrically calibrated to 2% rms and 100 mas rms per coordinate, respectively. The imaging data have all been processed through a new version of the SDSS imaging pipeline, in which the most important improvement since the last data release is fixing an error in the model fits to each object. The result is that model magnitudes are now a good proxy for point-spread function magnitudes for point sources, and Petrosian magnitudes for extended sources. The spectroscopy extends from 3800 to 9200 Å at a resolution of 2000. The spectroscopic software now repairs a systematic error in the radial velocities of certain types of stars and has substantially improved spectrophotometry. All data included in the SDSS Early Data Release and First Data Release are reprocessed with the improved pipelines and included in the Second Data Release. Further characteristics of the data are described, as are the data products themselves and the tools for accessing them.

AB - The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its Second Data Release. This data release consists of 3324 deg 2 of five-band (ugriz) imaging data with photometry for over 88 million unique objects, 367,360 spectra of galaxies, quasars, stars, and calibrating blank sky patches selected over 2627 deg2 of this area, and tables of measured parameters from these data. The imaging data reach a depth of r ≈ 22.2 (95% completeness limit for point sources) and are photometrically and astrometrically calibrated to 2% rms and 100 mas rms per coordinate, respectively. The imaging data have all been processed through a new version of the SDSS imaging pipeline, in which the most important improvement since the last data release is fixing an error in the model fits to each object. The result is that model magnitudes are now a good proxy for point-spread function magnitudes for point sources, and Petrosian magnitudes for extended sources. The spectroscopy extends from 3800 to 9200 Å at a resolution of 2000. The spectroscopic software now repairs a systematic error in the radial velocities of certain types of stars and has substantially improved spectrophotometry. All data included in the SDSS Early Data Release and First Data Release are reprocessed with the improved pipelines and included in the Second Data Release. Further characteristics of the data are described, as are the data products themselves and the tools for accessing them.

UR - http://www.scopus.com/inward/record.url?scp=4544347521&partnerID=8YFLogxK

U2 - 10.1086/421365

DO - 10.1086/421365

M3 - Review article

AN - SCOPUS:4544347521

SN - 0004-6256

VL - 128

SP - 502

EP - 512

JO - Astronomical Journal

JF - Astronomical Journal

IS - 1 1783

ER -

The second data release of the sloan digital sky survey

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