HD 2
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cassiopeia [1] |
| Right ascension | 00h 05m 05.95s[2] |
| Declination | +57° 46′ 13.20″[2] |
| Apparent magnitude (V) | 8.21±0.01[3] |
| Characteristics | |
| Spectral type | F5 [4] or F9IV |
| Astrometry | |
| Proper motion (μ) | RA: +33.683[2] mas/yr Dec.: +74.011[2] mas/yr |
| Parallax (π) | 9.3044 ± 0.0417[2] mas |
| Distance | 351 ± 2 ly (107.5 ± 0.5 pc) |
| Details | |
| Mass | 1.26+0.27 −0.15 [5] M☉ |
| Radius | 2.0±0.1 [2] R☉ |
| Luminosity | 5.04±0.03 [2] L☉ |
| Surface gravity (log g) | 3.98+0.11 −0.07 [5] cgs |
| Temperature | 6050+152 −162 [2] K |
| Metallicity [Fe/H] | −0.01+0.13 −0.14 [6] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 2 is a solitary star in the constellation Cassiopeia. With an apparent magnitude of 8.21, it requires an amateur telescope to be seen, and is located 351 light-years (108 pc) based on parallax.
Properties[edit]
HD 2 is a G-type star with 26% more mass than the Sun, and has double the latter’s radius. It radiates at 5 solar luminosities from its photosphere at an effective temperature of 6,050 K. HD 2 metal abundance is at solar metallicity, with 97% the abundance of heavy metals compared to the Sun.
References[edit]
- ↑ "Find the constellation which contains given sky coordinates". djm.cc. Retrieved 2021-07-09.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 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. Gaia DR2 record for this source at VizieR.
- ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000-03-01). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. ISSN 0004-6361.
- ↑ Cannon, A. J.; Pickering, E. C. (1993-10-01). "VizieR Online Data Catalog: Henry Draper Catalogue and Extension (Cannon+ 1918-1924; ADC 1989)". VizieR Online Data Catalog. 3135.
- ↑ 5.0 5.1 Stassun, Keivan G.; Oelkers, Ryan J.; Paegert, Martin; Torres, Guillermo; Pepper, Joshua; De Lee, Nathan; Collins, Kevin; Latham, David W.; Muirhead, Philip S.; Chittidi, Jay; Rojas-Ayala, Bárbara (2019-10-01). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158: 138. doi:10.3847/1538-3881/ab3467. hdl:1721.1/124721. ISSN 0004-6256.
- ↑ Ammons, S. Mark; Robinson, Sarah E.; Strader, Jay; Laughlin, Gregory; Fischer, Debra; Wolf, Aaron (2006-02-01). "The N2K Consortium. IV. New Temperatures and Metallicities for More than 100,000 FGK Dwarfs". The Astrophysical Journal. 638: 1004–1017. doi:10.1086/498490. ISSN 0004-637X.
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