HD 196885

HD 196885
Observation data
Epoch J2000      Equinox J2000
Constellation Delphinus
Right ascension 20h 39m 51.87531s[1]
Declination +11° 14′ 58.7029″[1]
Apparent magnitude (V) 6.39[2]
Characteristics
Evolutionary stage main-sequence star
Spectral type F8V[3] + M1±1V[4]
B−V color index 0.559±0.006[2]
Astrometry
Radial velocity (Rv)−30.13±0.09[2] km/s
Proper motion (μ) RA: +71.470±0.066[1] mas/yr
Dec.: +89.165±0.076[1] mas/yr
Parallax (π)29.4076 ± 0.0272 mas[5]
Distance110.9 ± 0.1 ly
(34.00 ± 0.03 pc)
Absolute magnitude (MV)3.76[2]
Orbit[6]
PrimaryHD 196885 A
CompanionHD 196886 B
Period (P)72.06 ± 4.59 yr
Semi-major axis (a)21.00 ± 0.86 AU
Eccentricity (e)0.42 ± 0.03
Inclination (i)116.8 ± 0.7°
Longitude of the node (Ω)79.150°
Periastron epoch (T)1982.886 AD
Argument of periastron (ω)
(secondary)		231.464°
Details[6]
A
Mass1.3 ± 0.1 M☉
Radius1.45+0.02
−0.05[citation needed] R☉
Luminosity2.695±0.006[1] L☉
Surface gravity (log g)4.46±0.02 cgs
Temperature6,340±39 K
Metallicity [Fe/H]0.29±0.05 dex
Rotation15 days[citation needed]
Rotational velocity (v sin i)7.3±1.5[citation needed] km/s
Age1.5—3.5 Gyr
B
Mass0.45±0.01[6] M☉
Other designations
BD+10° 4351, GC 28784, HD 196885, HIP 101966, HR 7907, SAO 106360, WDS J20399+1115, GCRV 12946, GSC 01092-01778, 2MASS J20395188+1114588[7]
Database references
SIMBADdata

HD 196885 is a binary star system in the northern constellation of Delphinus. It comprises a pair of stars HD 196885 A and HD 196885 B on a 69-years eccentric orbit.[6]

The primary star is near the lower limit of visibility to the naked eye with an apparent visual magnitude of 6.39.[2] It is located at a distance of 110.9 light years from the Sun.[5] It is drifting closer with a radial velocity of −30 km/s, and is expected to come to within 52.5 light-years in 836,000 years.[2]

The secondary, component B, is a red dwarf star separated by 0.6 arcseconds from the primary star that was discovered in 2006 with NaCo at VLT.[8][4] It has a class in the range M1V to M3V[4] with 51% of the Sun's mass.[6]

The star BD+10 4351B, located 192 arcseconds away from HD 196885 is located at the same distance and may be a physically bound companion star, in which case HD 196885 is a trinary system.[9] If it is bound, then the separation is at least 6,600 AU (the separation along the line-of-sight is unknown, so this value represents a lower limit on the true separation).[citation needed]

  1. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference gray2001 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Chauvin2007 was invoked but never defined (see the help page).
  5. ^ a b Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  6. ^ a b c d e Cite error: The named reference Chauvin2022 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Chauvin2006 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference geneva was invoked but never defined (see the help page).