Astronomy:HD 99922

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Short description: Double star in the constellation Crater
HD 99922
Location of HD 99922 (circled in red)
Observation data
{{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| [[History:Epoch|Epoch J2000]]      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}}
Constellation Crater[1]
HD 99922 A
Right ascension  11h 29m 38.619s[2]
Declination −24° 27′ 50.48″[2]
Apparent magnitude (V) 5.813[3]
HD 99922 B
Right ascension  11h 29m 39.219s[4]
Declination −24° 27′ 49.40″[4]
Apparent magnitude (V) 8.543[3]
Characteristics
HD 99922 A
Evolutionary stage main sequence[2][5]
Spectral type A0V[6]
B−V color index +0.07[7]
HD 99922 B
Evolutionary stage main sequence[4]
Spectral type F1V[8]
Astrometry
HD 99922 A
Radial velocity (Rv)−2.50[9] km/s
Proper motion (μ) RA: −44.450[2] mas/yr
Dec.: +15.779[2] mas/yr
Parallax (π)8.6451 ± 0.0395[2] mas
Distance377 ± 2 ly
(115.7 ± 0.5 pc)
HD 99922 B
Proper motion (μ) RA: −50.386[4] mas/yr
Dec.: +19.267[4] mas/yr
Parallax (π)9.2333 ± 0.0678[4] mas
Distance353 ± 3 ly
(108.3 ± 0.8 pc)
Details
HD 99922 A
Mass2.2[10] M☉
Radius3.2[10] R☉
Luminosity55[10] L☉
Surface gravity (log g)4.05[11] cgs
Temperature10,186[11] K
Metallicity [Fe/H]+0.25[11] dex
Rotation1.39 days[12]
Rotational velocity (v sin i)65[5] km/s
Age510[2] Myr
HD 99922 B
Mass1.3[10] M☉
Radius1.4[10] R☉
Surface gravity (log g)4.23[10] cgs
Temperature6,449[10] K
Age4.7[13] Gyr
Other designations
CD−23°10009, HD 99922, HR 4428, ADS 8183 AB[14]
HD 99922 A: HIP 56078, SAO 179935[15]
HD 99922 B: SAO 179936[16]
Database references
SIMBADAB
A
B

HD 99922 is a double star system in the constellation of Crater. It shines with an apparent visual magnitude of 5.77 from a distance of about 377 light years (116 parsecs) away from the Earth. The primary star is an A-type main sequence star; the secondary star is located about 8 arcseconds away.[16] Given the discrepant parallaxes of the two stars, they are unlikely to be physically associated.[14][16]

Other designations for the primary component include HR 4428 and HIP 56078.[14]

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 Høg, E. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. Bibcode: 2000A&A...355L..27H. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  5. ↑ 5.0 5.1 Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z. 
  6. ↑ Houk, N.; Smith-Moore, M. (1988). "Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, Declinations -26°.0 to -12°.0.". Michigan Catalogue of Two-Dimensional Spectral Types for the Hd Stars. Volume 4 4. Bibcode: 1988mcts.book.....H. 
  7. ↑ Nicolet, B. (1964). "Catalogue of homogeneous data in the UBV photoelectric photometric system". Astronomy and Astrophysics Supplement Series 34: 1–49. Bibcode: 1978A&AS...34....1N. 
  8. ↑ Adams, Walter S.; Joy, Alfred H.; Humason, Milton L.; Brayton, Ada Margaret (1935). "The Spectroscopic Absolute Magnitudes and Parallaxes of 4179 Stars". The Astrophysical Journal 81: 187. doi:10.1086/143628. Bibcode: 1935ApJ....81..187A. 
  9. ↑ Kharchenko, N. V. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten 328 (9): 889. doi:10.1002/asna.200710776. Bibcode: 2007AN....328..889K. 
  10. ↑ 10.0 10.1 10.2 10.3 10.4 10.5 10.6 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  11. ↑ 11.0 11.1 11.2 Huson, Dylan; Cowan, Indiana; Sizemore, Logan; Kounkel, Marina; Hutchinson, Brian (2025). "Gaia Net: Toward Robust Spectroscopic Parameters of Stars of all Evolutionary Stages". The Astrophysical Journal 984 (1): 58. doi:10.3847/1538-4357/adc2fa. Bibcode: 2025ApJ...984...58H. 
  12. ↑ Oelkers, Ryan J.; Rodriguez, Joseph E.; Stassun, Keivan G.; Pepper, Joshua; Somers, Garrett; Kafka, Stella; Stevens, Daniel J.; Beatty, Thomas G. et al. (2018). "Variability Properties of Four Million Sources in the TESS Input Catalog Observed with the Kilodegree Extremely Little Telescope Survey". The Astronomical Journal 155 (1): 39. doi:10.3847/1538-3881/aa9bf4. Bibcode: 2018AJ....155...39O. 
  13. ↑ Kordopatis, G.; Schultheis, M.; McMillan, P. J.; Palicio, P. A.; De Laverny, P.; Recio-Blanco, A.; Creevey, O.; Álvarez, M. A. et al. (2023). "Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3". Astronomy and Astrophysics 669: A104. doi:10.1051/0004-6361/202244283. Bibcode: 2023A&A...669A.104K. 
  14. ↑ 14.0 14.1 14.2 "HD 99922". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+99922. 
  15. ↑ "HD 99922A". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+99922A. 
  16. ↑ 16.0 16.1 16.2 "HD 99922B". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+99922B. 



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