4 Camelopardalis
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 04h 48m 00.2729s |
| Declination | +56° 45′ 25.837″ |
| Apparent magnitude (V) | 5.29 |
| Characteristics | |
| Spectral type | A3m |
| U−B color index | 0.12 |
| B−V color index | 0.246±0.003 |
| Astrometry | |
| Radial velocity (Rv) | +22.50±0.9 km/s |
| Proper motion (μ) | RA: +52.892 mas/yr Dec.: −140.618 mas/yr |
| Parallax (π) | 18.4464±0.1109 mas |
| Distance | 177 ± 1 ly (54.2 ± 0.3 pc) |
| Absolute magnitude (MV) | 1.68 |
| Orbit | |
| Primary | Aa |
| Secondary | Ab |
| Period (P) | 90 yr |
| Semi-major axis (a) | 0.503″ |
| Eccentricity (e) | 0.87 |
| Inclination (i) | 120.0° |
| Longitude of the node (Ω) | 54.5° |
| Argument of periastron (ω) (secondary) | 235.9° |
| Details | |
| Mass | 2.01 M☉ |
| Radius | 2.57+0.05 −0.17 R☉ |
| Luminosity | 17.64 L☉ |
| Surface gravity (log g) | 3.98 cgs |
| Temperature | 7,700 K |
| Metallicity [Fe/H] | +0.27 dex |
| Rotational velocity (v sin i) | 75 km/s |
| Age | 560 Myr |
| Other designations | |
| 4 Cam, BD+56°973, FK5 175, HD 30121, HIP 22287, HR 1511, SAO 24829 | |
| Database references | |
| SIMBAD | data |
4 Camelopardalis is a probable multiple star in the northern constellation of Camelopardalis, located 177 light years away from the Sun, based upon parallax. With a combined apparent visual magnitude of 5.29, it is visible to the naked eye as a faint, white-hued star. The pair have a relatively high proper motion, traversing the celestial sphere at an angular rate of 0.158″ per year. The system's proper motion makes it a candidate for membership in the IC 2391 supercluster. They are moving away from the Earth with a heliocentric radial velocity of 22.5 km/s.
The brighter member, designated component A, is classified as an Am star, which indicates that the spectrum shows abnormalities of certain elements. It is an estimated 560 million years old and is spinning with a projected rotational velocity of 75 The star has 2.01 times the mass of the Sun and 2.57 times the Sun's radius. It is radiating 18 times the Sun's luminosity from its photosphere at an effective temperature of 7,700 K.
There is a faint, magnitude 9.49 companion at an angular separation of 0.610″ – component B; the pair most likely form a binary systemwith a period of about 90 years. There is also a 13th-magnitude visual companion 13″ away which shares a common proper motion and parallax. Another listed companion, a 12th-magnitude star nearly 2′ away, is probably unrelated.
References
- 1 2 3 4 5 6 Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- 1 2 3 4 5 6 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.
- ↑ 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
- ↑ Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
- 1 2 Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
- 1 2 3 Tokovinin, Andrei; Everett, Mark E.; Horch, Elliott P.; Torres, Guillermo; Latham, David W. (2019), "Speckle Observations and Orbits of Multiple Stars", The Astronomical Journal, 158 (4): 167, arXiv:1908.11445, Bibcode:2019AJ....158..167T, doi:10.3847/1538-3881/ab4137, S2CID 201698428.
- 1 2 3 4 De Rosa, R. J.; et al. (2014), "The VAST Survey - III. The multiplicity of A-type stars within 75 pc", Monthly Notices of the Royal Astronomical Society, 437 (2): 1216–1240, arXiv:1311.7141, Bibcode:2014MNRAS.437.1216D, doi:10.1093/mnras/stt1932.
- 1 2 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.
- 1 2 3 4 Takeda, Yoichi; et al. (October 2018), "Photospheric carbon, nitrogen, and oxygen abundances of A-type main-sequence stars*", Publications of the Astronomical Society of Japan, 70 (5): 91, arXiv:1807.06265, Bibcode:2018PASJ...70...91T, doi:10.1093/pasj/psy091, 91.
- 1 2 Royer, F.; et al. (2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i in the northern hemisphere", Astronomy and Astrophysics, 393 (3): 897–911, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943, S2CID 14070763
- 1 2 "4 Cam", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2019-04-14.
- ↑ Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854, S2CID 2603568.
- ↑ Eggen, Olin J. (December 1995), "Reality Tests of Superclusters in the Young Disk Population", Astronomical Journal, 110: 2862, Bibcode:1995AJ....110.2862E, doi:10.1086/117734.
- ↑ Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics, 498 (3): 961–966, Bibcode:2009A&A...498..961R, doi:10.1051/0004-6361/200810788
- ↑ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ↑ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
