HD 1185

HD 1185 is a double star[8] in the northern constellation of Andromeda. The primary, with an apparent magnitude of 6.15, is a white main-sequence star of spectral type A1Si[3], indicating it has stronger silicon absorption lines than usual, thus making it also an Ap star. The secondary companion, which is 9.08 arcseconds away, is not visible to the naked eye at an apparent magnitude of 9.76, and is also an A-type star. It shares common proper motion and parallax with the primary star[7] but orbital parameters are still unknown.

HD 1185
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  00h 16m 21.52867s[1]
Declination +43° 35′ 42.1809″[1]
Apparent magnitude (V) 6.150[2]
Characteristics
Spectral type A1Si[3]
U−B color index 0.03[3]
B−V color index 0.05[3]
Astrometry
A
Radial velocity (Rv)3.00±2.60[4] km/s
Proper motion (μ) RA: 35.595±0.087[1] mas/yr
Dec.: −22.878±0.049[1] mas/yr
Parallax (π)10.1622 ± 0.0606[1] mas
Distance321 ± 2 ly
(98.4 ± 0.6 pc)
Absolute magnitude (MV)0.99[5]
B
Radial velocity (Rv)4.54±0.68[1] km/s
Proper motion (μ) RA: 34.490±0.063[1] mas/yr
Dec.: −21.927±0.044[1] mas/yr
Parallax (π)10.1198 ± 0.0449[1] mas
Distance322 ± 1 ly
(98.8 ± 0.4 pc)
Details[6]
A
Mass2.31±0.07 M☉
Luminosity39.79 L☉
Temperature8,912.5 K
Rotational velocity (v sin i)128 km/s
Other designations
BD+42° 41, HD 1185, HIP 1302, HR 56, SAO 36221, WDS 00164+4336[7]
Database references
SIMBADdata

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. Høg, E.; et al. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy & Astrophysics, 355: L27–L30, Bibcode:2000A&A...355L..27H.
  3. 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.
  4. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  5. 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.
  6. Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. Vizier catalog entry
  7. "BD+42 41B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 15 February 2014.
  8. McAlister, H. A.; et al. (1989). "ICCD speckle observations of binary stars. IV - Measurements during 1986-1988 from the Kitt Peak 4 M telescope". The Astronomical Journal. 97: 510. Bibcode:1989AJ.....97..510M. doi:10.1086/115001.
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