Wikipedia
HD 99922
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 450 light years (140 parsecs) away from the Earth. The primary star is an A-type main sequence star; the secondary star is located about 8 arcseconds away.[7]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Crater |
| HD 99922 A | |
| Right ascension | 11h 29m 38.612s[1] |
| Declination | −24° 27′ 50.52″[1] |
| Apparent magnitude (V) | 5.813[1] |
| HD 99922 B | |
| Right ascension | 11h 29m 39.209s[1] |
| Declination | −24° 27′ 49.24″[1] |
| Apparent magnitude (V) | 8.543[1] |
| Characteristics | |
| HD 99922 A | |
| Spectral type | A0V[2] |
| B−V color index | +0.07[3] |
| Astrometry | |
| HD 99922 A | |
| Radial velocity (Rv) | -2.50[4] km/s |
| Proper motion (μ) | RA: -56.4[1] mas/yr Dec.: 9.7[1] mas/yr |
| Parallax (π) | 7.32 ± 0.61 mas[5] |
| Distance | 450 ± 40 ly (140 ± 10 pc) |
| HD 99922 B | |
| Proper motion (μ) | RA: -49.7[1] mas/yr Dec.: 19.4[1] mas/yr |
| Other designations | |
| HD 99922 A: SAO 179935[6] | |
| HD 99922 B: SAO 179936[7] | |
| Database references | |
| SIMBAD | AB |
| A | |
| B | |
Other designations include HR 4428 and HIP 56078.[2]
References edit
- ^ a b c d e f g h i j Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
- ^ a b c "HD 99922". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 February 2017.
- ^ 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.
- ^ Kharchenko, N. V.; et al. (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. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. S2CID 119323941.
- ^ van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
- ^ "HD 99922A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 February 2017.
- ^ a b "HD 99922B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 February 2017.