HD 221776
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 23h 34m 46.74220s[1] |
| Declination | +38° 01′ 26.3950″[1] |
| Apparent magnitude (V) | 6.18[2] |
| Characteristics | |
| Spectral type | K5III[2] |
| U−B color index | +1.97[3] |
| B−V color index | +1.586[2] |
| Astrometry | |
| Radial velocity (Rv) | −13.74±0.11[4] km/s |
| Proper motion (μ) | RA: 10.37±0.32[1] mas/yr Dec.: 10.59±0.23[1] mas/yr |
| Parallax (π) | 4.30 ± 0.33[1] mas |
| Distance | 760 ± 60 ly (230 ± 20 pc) |
| Absolute magnitude (MV) | −0.68[2] |
| Details | |
| Luminosity | 451[5] L☉ |
| Temperature | 3,800[5] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
HD 221776 is a double star in the northern constellation of Andromeda. It has an infrared excess, indicating the star is associated with a cloud of dust particles.[5] There is a magnitude 11.8 companion at angular separation of 19.8″ along a position angle of 329°, as of 2002.[6]
References
- 1 2 3 4 5 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 - 1 2 3 4 Jasniewicz, G.; et al. (February 1999), "Late-type giants with infrared excess. I. Lithium abundances", Astronomy and Astrophysics, 342: 831–838, Bibcode:1999A&A...342..831J
- ↑ Guetter, H. H.; Hewitt, A. V. (June 1984), "Photoelectric UBV photometry for 317 PZT and VZT stars", Publications of the Astronomical Society of the Pacific, 96: 441−443, Bibcode:1984PASP...96..441G, doi:10.1086/131362
- ↑ Famaey, B.; et al. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430: 165–186. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272.
- 1 2 3 Kim, Sungsoo S.; et al. (April 2001), "Extent of Excess Far-Infrared Emission around Luminosity Class III Stars", The Astrophysical Journal, 550 (2): 1000−1006, arXiv:astro-ph/0012001, Bibcode:2001ApJ...550.1000K, doi:10.1086/319803
- ↑ Mason, B. D.; et al. (2014), The Washington Visual Double Star Catalog, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22
External links
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