29 Camelopardalis

29 Camelopardalis (29 Cam) is a double star in the circumpolar constellation Camelopardalis. With an apparent magnitude of 6.59,^[2] it's right below the max visibility to the naked eye, and can only be viewed under phenomenal conditions. The star is located 484 light years^[1] away based on parallax, but is drifting further away with a radial velocity of 3.9 km/s.^[3]

29 Camelopardalis

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Camelopardalis
Right ascension	05h 50m 33.8729s[1]
Declination	+56° 55′ 08.1822″[1]
Apparent magnitude (V)	6.590±0.009[2]
Characteristics
29 Cam A
Spectral type	A4 IV-V
U−B color index	+0.13[2]
B−V color index	+0.09[2]
29 Cam B
Spectral type	A3 V
Astrometry
29 Cam A
Radial velocity (Rv)	3.9±2[3] km/s
Proper motion (μ)	RA: –19.460[1] mas/yr Dec.: –4.249[1] mas/yr
Parallax (π)	6.7370 ± 0.0607 mas[1]
Distance	484 ± 4 ly (148 ± 1 pc)
Absolute magnitude (MV)	+0.71[4]
29 Cam B
Proper motion (μ)	RA: +2.585[5] mas/yr Dec.: –0.570[5] mas/yr
Parallax (π)	1.6375 ± 0.0483 mas[5]
Distance	1,990 ± 60 ly (610 ± 20 pc)
Details
29 Cam A
Mass	2.47 ± 0.08[6] M☉
Radius	3.49+0.14 −0.12[7] R☉
Luminosity	58.9+8.9 −7.6[6] L☉
Surface gravity (log g)	3.77[8] cgs
Temperature	8,337 ± 96[6] K
Rotational velocity (v sin i)	123[9] km/s
Age	380 ± 14[6] Myr
29 Cam B
Mass	2.12[10] M☉
Radius	2.06[11] R☉
Luminosity	15.043[11] L☉
Temperature	7911[11] K
Rotational velocity (v sin i)	110±8[12] km/s
Other designations
BD+56° 1065, HD 38618, HIP 27592, HR 1992, SAO 25403, WDS J05506+5655A
Database references
SIMBAD	data

29 Cam A

29 Cam A has a classification of A4IV-V, which suggests that this star is beginning to evolve off the main sequence. Zorec et al. models it as a star that has completed 90.6% of the main sequence, which correlates to an age of 380 million years.^[6] At present, 29 Cam has 2.47 the mass of the Sun,^[6] and 3.49 times its radius. ^[7] It radiates at 58.9 times the luminosity of the Sun from an effective temperature of 8,337 K,^[6] which gives it a white hue of an A-type star. 29 Cam spins rapidly at a projected rotational velocity of 123 km/s despite its evolved state.

29 Cam B

29 Cam has a companion designated BD+56 1065B, which is a 10 magnitude star. According to the proper motion, this star is unrelated to the primary, and is 4 times farther than the primary.^[13] The companion is relatively cooler and less luminous than the primary.

References

1. 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.
2. Oja, T. (August 1991). "UBV photometry of stars whose positions are accurately known. VI". Astronomy and Astrophysics Supplement Series. 89: 415–419. Bibcode:1991A&AS...89..415O. ISSN 0365-0138.
3. Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
4. Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 119257644.
5. 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.
6. Zorec, J.; Royer, F. (1 January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. S2CID 55586789.
7. 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 (October 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. hdl:1721.1/124721. ISSN 0004-6256. S2CID 166227927.
8. Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevic, G.; Monari, G.; Cantat-Gaudin, T. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361.
9. Royer, F.; Grenier, S.; Baylac, M.-O.; Gómez, A. E.; Zorec, J. (October 2002). "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i". Astronomy and Astrophysics. 393: 897–911. arXiv:astro-ph/0205255. Bibcode:2002A&A...393..897R. doi:10.1051/0004-6361:20020943. ISSN 0004-6361.
10. 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 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. hdl:1721.1/124721. ISSN 0004-6256. S2CID 166227927.
11. Gaia Collaboration; Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; Babusiaux, C.; Bailer-Jones, C. A. L.; Biermann, M.; Evans, D. W.; Eyer, L.; Jansen, F. (2018-08-01). "Gaia Data Release 2. Summary of the contents and survey properties". Astronomy and Astrophysics. 616: A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. ISSN 0004-6361.
12. Glebocki, R.; Gnacinski, P. (2005-03-01). "Systematic errors in the determination of stellar rotational velocities". 13th Cambridge Workshop on Cool Stars. 560: 571. Bibcode:2005ESASP.560..571G.
13. Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001-12-01). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256. S2CID 119533755.