SDSS J1229+1122

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Coordinates: Sky map 12h 29m 52.66s, +11° 22′ 27.8″

SDSS J1229+1122
Observation data
Epoch J2000.0[1]      Equinox J2000.0[1]
Constellation Virgo
Right ascension 12h 29m 52.66s[1]
Declination +11° 22′ 27.8″[1]
Apparent magnitude (V) 22.85[2]
Spectral typeO[2]
Other designations
SDSS J122952.66+112227.8[3]
Database references

SDSS J1229+1122 (SDSS J122952.66+112227.8) is a blue supergiant O-type star in the tail of dwarf irregular galaxy IC 3418. It illuminates a nebula clump of gas, and was discovered from the spectrum of the illumination source. The clump of gas resides in a tail caused by ram pressure stripping of gas from the galaxy by the galaxy cluster.[2] It was determined to be a blue supergiant through analysis of its spectrum.[4] Until the discovery of the doubly gravitationally lensed MACS J1149 Lensed Star 1 (also known as Icarus) in 2018, it was the most distant-known star, at 55 million light-years (17 Mpc) (stars more distant than this are only known through events that they cause, such as stellar explosions of supernovae and gamma ray bursts).[5] (The record for the most distant star is, as of June 2017, a strongly lensed star at redshift 1.5 behind the galaxy cluster MACS1149.) The discovery was made by Drs. Youichi Ohyama and Ananda Hota,[6] using the Subaru Telescope.[7] The star and its galaxy are in the Virgo Cluster of galaxies. The clump of gas that the star illuminates is referred to as D3 or IC3418 D3, and lies within a filamentary structure referred to as F1 or IC3418 F1.[2] The galactic tail and all within it are escaping the galaxy to become intracluster flotsam, unattached to any galaxy, just the cluster.[2]


  1. ^ a b c "INDEX for SDSS J122952.66+112227.8". NASA/IPAC Extragalactic Database. Retrieved 2014-05-05.
  2. ^ a b c d e Ohyama, Youichi; Hota, Ananda (9 April 2013). "Discovery of a Possibly Single Blue Supergiant Star in the Intra-cluster Region of Virgo Cluster of Galaxies". The Astrophysical Journal Letters (published April 2013). 767 (2): 6. arXiv:1304.2560. Bibcode:2013ApJ...767L..29O. doi:10.1088/2041-8205/767/2/L29. L29.
  3. ^ "SDSS J122952.66+112227.8". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2014-05-05.
  4. ^ "Discovery of a Blue Supergiant Star Born in the Wild". Subaru Telescope. 10 April 2013.
  5. ^ Camille M. Carlisle (12 April 2013). "The Most Distant Star Ever Seen?". Sky and Telescope.
  6. ^ "Researchers Discover Aging Blue Supergiant Star In Virgo Cluster". Asian Scientist. 16 April 2013.
  7. ^ Miller, Erin (19 April 2013). "Island telescopes spot rare blue supergiant star". West Hawaii Today.