HD 19789

HD 19789 is a double star in the northern constellation of Aries. The primary component has an orange hue and is barely visible to the naked eye with an apparent visual magnitude of 6.11.[2] it is located at a distance of approximately 390 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +8 km/s.[2] The star is located near the ecliptic and thus is subject to lunar occultations.[5]

HD 19789
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Aries
Right ascension  03h 11m 21.91887s[1]
Declination +13° 02′ 52.2356″[1]
Apparent magnitude (V) 6.11[2]
Characteristics
Spectral type K0IIIp[3]
B−V color index 1.038±0.012[2]
Astrometry
Radial velocity (Rv)+8.10±0.32[2] km/s
Proper motion (μ) RA: −15.291[1] mas/yr
Dec.: +16.363[1] mas/yr
Parallax (π)8.3619 ± 0.0857[1] mas
Distance390 ± 4 ly
(120 ± 1 pc)
Absolute magnitude (MV)0.53[2]
Details
Radius10.95+0.34
−0.25[1] R☉
Luminosity58.5±0.7[1] L☉
Temperature4,822+57
−72[1] K
Other designations
BD+12°452, FK5 2488, HD 19789, HIP 14821, HR 952, SAO 93327, WDS WDS J03114+1303AB[4]
Database references
SIMBADdata

The primary, designated component A, is an aging giant star with a stellar classification of K0IIIp,[3] where the 'p' suffix indicates some type of unspecified peculiarity in the spectrum. It has exhausted the supply of hydrogen at its core, then expanded and cooled off the main sequence: at present it has 11 times the girth of the Sun. The star is radiating 58.5 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4822 K.[1] It has one reported companion, component B, at an angular separation of 0.5″ along a position angle of 23°, as of 1982.[6]

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. 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.
  3. Harlan, E. A. (September 1969), "MK classifications for F- and G-type stars. I", Astronomical Journal, 74: 916–919, Bibcode:1969AJ.....74..916H, doi:10.1086/110881.
  4. "HD 19789". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2011-12-20.
  5. Blow, G. L.; et al. (November 1982), "Photoelectric observations of lunar occultations. XIII", Astronomical Journal, 87: 1571–1584, Bibcode:1982AJ.....87.1571B, doi:10.1086/113247. See entry 5931, p. 1580, SAO 93327.
  6. Mason, B. D.; et al. (2014), The Washington Visual Double Star Catalog, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22
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