HD 87822

HD 87822
Observation data
Epoch J2000      Equinox J2000
Constellation Leo Minor
AB
Right ascension 10h 08m 15.88717s[1]
Declination +31° 36′ 14.5875″[1]
Apparent magnitude (V) 6.240[2] (6.90 + 7.20)[3]
C
Right ascension 10h 08m 16.16565s[4]
Declination +31° 35′ 47.1421″[4]
Apparent magnitude (V) 13.8[5]
Characteristics
AB
Spectral type F4V[6]
U−B color index +0.01[7]
B−V color index +0.445[7]
C
Spectral type dMs1.5[8]
Astrometry
AB
Radial velocity (Rv)−8.0[2] km/s
Proper motion (μ) RA: −80.47[1] mas/yr
Dec.: −92.07[1] mas/yr
Parallax (π)16.33 ± 0.42 mas[1]
Distance200 ± 5 ly
(61 ± 2 pc)
Absolute magnitude (MV)2.23[2]
C
Radial velocity (Rv)−5.77[4] km/s
Proper motion (μ) RA: −80.484[4] mas/yr
Dec.: −87.851[4] mas/yr
Parallax (π)16.0212 ± 0.0186 mas[4]
Distance203.6 ± 0.2 ly
(62.42 ± 0.07 pc)
Orbit[9]
PrimaryA
CompanionB
Period (P)17.765±0.036 yr
Semi-major axis (a)0.1560±0.0005″
Eccentricity (e)0.3960±0.0038
Inclination (i)84.59±0.20°
Longitude of the node (Ω)349.57±0.15°
Periastron epoch (T)B 1989.133±0.042
Argument of periastron (ω)
(secondary)		7.73±0.95°
Details
A
Mass1.45[10] M☉
Surface gravity (log g)4.18[6] cgs
Temperature6,533[6] K
Metallicity [Fe/H]0.10[6] dex
Rotational velocity (v sin i)8[11] km/s
Age1.6[2] Gyr
B
Mass1.38[10] M☉
C
Mass0.53[10] M☉
Radius0.53[5] R☉
Luminosity0.04[5] L☉
Surface gravity (log g)4.71[5] cgs
Temperature3,610[5] K
Metallicity [Fe/H]−0.31[12] dex
Other designations
BD+32°1982, HD 87822, HIP 49658, HR 3979, SAO 61882.
Database references
SIMBADdata

HD 87822 is a triple star in the northern constellation of Leo Minor.[10] The inner pair orbit each other with a period of about 18 years.[3]

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  2. ^ a b c d Cite error: The named reference aa475_519 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference aa546_A69_5 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference dr3c was invoked but never defined (see the help page).
  5. ^ a b c d e Cite error: The named reference ticv8 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference mnras374_2_664 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference MERMILLIOD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference zhong2019 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Hartkopf was invoked but never defined (see the help page).
  10. ^ a b c d Cite error: The named reference msc was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference uesugi_fukuda70 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference ding2022 was invoked but never defined (see the help page).