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S Apodis (HD 133444) is an R Coronae Borealis variable star located in the far southern constellation Apus. These are extremely hydrogen-deficient supergiants thought to have arisen as the result of the merger of two white dwarfs; fewer than 100 have been discovered as of 2012.[3] Located around 13,000 light-years distant, it shines with a luminosity approximately 960 times that of the Sun and has a surface temperature of 3916 K.[5]

S Apodis

The visual band light curve of S Apodis, from AAVSO data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Apus
Right ascension 15h 09m 24.53447s[2]
Declination −72° 03′ 45.1898″[2]
Apparent magnitude (V) 9.7[3]
Characteristics
Spectral type C
Variable type R Coronae Borealis variable
Astrometry
Radial velocity (Rv)-75.00 km/s
Proper motion (μ) RA: -6.509 ± 0.036[4] mas/yr
Dec.: -2.099 ± 0.044 [4] mas/yr
Parallax (π)0.2426 ± 0.0253 mas[4]
Distanceapprox. 13,000 ly
(approx. 4,100 pc)
Details
Luminosity960[5] L☉
Temperature3916[5] K
Other designations
CD-71° 1120, HD 133444, HIP 74179
Database references
SIMBADdata

References


  1. "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
  2. van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–64. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.Vizier catalog entry
  3. Tisserand; Clayton; Welch; Pilecki; Wyrzykowski; Kilkenny (2012). "The Ongoing Pursuit of R Coronae Borealis Stars: ASAS-3 Survey Strikes Again". Astronomy & Astrophysics. 551: 22. arXiv:1211.2475. Bibcode:2013A&A...551A..77T. doi:10.1051/0004-6361/201220713. S2CID 59060842. A77.
  4. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  5. McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. S2CID 118665352.

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