HD 19275
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cassiopeia[1] |
| Right ascension | 03h 11m 56.26916s[2] |
| Declination | +74° 23′ 37.1699″[2] |
| Apparent magnitude (V) | 4.85[1] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | A2Vnn[3] |
| U−B color index | +0.05 |
| B−V color index | +0.035±0.006[1] |
| Astrometry | |
| Radial velocity (Rv) | 11.9±3.1[1] km/s |
| Proper motion (μ) | RA: +14.158[2] mas/yr Dec.: −86.811[2] mas/yr |
| Parallax (π) | 19.6409±0.0848 mas[2] |
| Distance | 166.1 ± 0.7 ly (50.9 ± 0.2 pc) |
| Absolute magnitude (MV) | 1.32[1] |
| Details | |
| Mass | 1.80+0.32 −0.29[4] M☉ |
| Radius | 2.7[5] R☉ |
| Luminosity | 27.27[1] L☉ |
| Surface gravity (log g) | 4.20±0.25[4] cgs |
| Temperature | 8,875±1,000[4] K |
| Metallicity [Fe/H] | −0.11±0.26[6] dex |
| Rotational velocity (v sin i) | 250[7] km/s |
| Age | 71+317 −60[4] Gyr |
| Other designations | |
| Shangcheng, BD+73°168, FK5 2222, GC 3759, HD 19275, HIP 14862, HR 932, SAO 4840, GSC 04325-01562[8] | |
| Database references | |
| SIMBAD | data |
HD 19275, also named Shangcheng,[9] is a single[10] star in the northern constellation of Cassiopeia. It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.85.[1] The distance to HD 19275 is 166 light years as determined using parallax measurements.[2] It is drifting further away from the Sun with a radial velocity of around 12 km/s.[1]
This object is an A-type main-sequence star with a stellar classification of A2Vnn.[3] The 'nn' suffix indicates "nebulous" (broad) absorption lines in the spectrum due to rapid rotation. It is spinning with a projected rotational velocity of 250 km/s, which is giving the star an equatorial bulge that is estimated to be 15% larger than the polar radius.[7] The object is an estimated 71[4] million years old with 1.8[4] times the mass of the Sun and about 2.7[5] times the Sun's radius. It is radiating 27[1] times the luminosity of the Sun from its photosphere at an effective temperature of 8,875 K.[4]
In Chinese astronomy, the seventh star in the right wall of the Purple Forbidden Enclosure is named Shàng Chéng (The Great Imperial Minister, 上丞). Its identification varies across historical sources; it was identified as HD 19275 in an 11th-century star catalog, but as BK Camelopardalis in more recent sources.[11] The IAU Working Group on Star Names approved the name Shangcheng for HD 19275 on 25 December 2025, and it is now so entered in the IAU Catalog of Star Names.[9]
References
- ^ a b c d e f g h i Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b c d e f g Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875 Gaia DR3 record for this source at VizieR.
- ^ a b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
- ^ a b c d e f g Gullikson, Kevin; et al. (2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 40, arXiv:1604.06456, Bibcode:2016AJ....152...40G, doi:10.3847/0004-6256/152/2/40, S2CID 119179065.
- ^ a b Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition -Comments and statistics", Astronomy & Astrophysics, 367 (2): 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ Gáspár, András; et al. (2016), "The Correlation between Metallicity and Debris Disk Mass", The Astrophysical Journal, 826 (2): 171, arXiv:1604.07403, Bibcode:2016ApJ...826..171G, doi:10.3847/0004-637X/826/2/171, S2CID 119241004.
- ^ a b van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
- ^ "HD 19275", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2019-12-16
- ^ a b "IAU Catalog of Star Names". Retrieved 28 December 2025.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ "Zigong (紫宮)". All Skies Encyclopaedia. IAU Working Group on Star Names. Retrieved 28 December 2025.