85 Pegasi A/B
Observation data
Epoch J2000.0 Equinox J2000.0 |
| Constellation |
Pegasus |
| Right ascension |
00h 02m 10.16s [1] |
| Declination |
+27° 04′ 56.1″ [1] |
| Apparent magnitude (V) |
5.75 / 8.89 |
| Characteristics |
| Spectral type |
G5Vb / K7V |
| Apparent magnitude (B) |
6.42 / 11.0 |
| Apparent magnitude (R) |
5.38 |
| Apparent magnitude (I) |
4.96 |
| Apparent magnitude (J) |
4.702 |
| Apparent magnitude (H) |
4.179 |
| Apparent magnitude (K) |
4.068 |
| U−B color index |
0.05 / ? |
| B−V color index |
0.67 / ? |
| V−R color index |
0.37 / ? |
| R−I color index |
0.42 / ? |
| Variable type |
None |
| Astrometry |
|
| Radial velocity (Rv) |
-36.2 km/s |
| Proper motion (μ) |
RA: 780.22 ± 2.01 [1] mas/yr
Dec.: -917.75 ± 1.20 [1] mas/yr |
| Parallax (π) |
82.5 ± 0.8[2] mas |
| Distance |
39.5 ± 0.4 ly
(12.1 ± 0.1 pc) |
| Absolute magnitude (MV) |
5.28 / 8.54 |
|
| Orbit |
| Companion |
85 Pegasi B |
| Period (P) |
26.28 yr |
| Semimajor axis (a) |
0.83" |
| Eccentricity (e) |
0.38 |
| Inclination (i) |
49° |
| Details |
|
| Mass |
0.88 / 0.55 M☉ |
| Radius |
0.91 / 0.67 R☉ |
| Luminosity |
0.61 / 0.05 L☉ |
| Surface gravity (log g) |
4.45 / 4.58 |
| Temperature |
5550 / 4200 K |
| Metallicity |
58–75% |
| Age |
3.8–4.4[3] Gyr |
|
| Other designations |
BDS 12701, HR 9088, HD 224930, LFT 1848, LHS 101, LTT 17088, SAO 91669, HIP 171.
85 Pegasi A
ADS 17175 A, GJ 914 A, BD +26°4734 A, BU 733 A.
85 Pegasi B
ADS 17175 B, GJ 914 B, BD +26°4734 B, BU 733 B. |
| Database references |
| SIMBAD |
data |
| Exoplanet Archive |
data |
| ARICNS |
data |
85 Pegasi is a multiple star system 39.5 light years away in the constellation of Pegasus. The primary component is sixth magnitude 85 Pegasi A, which is a yellow dwarf like our Sun. The secondary component, 85 Pegasi B, is a ninth magnitude orange dwarf that takes 26.28 years to orbit at 10.3 AU around the primary in an elliptical orbit. The orbital distance ranges from 6.4 AU at periastron to 14.2 AU at apastron. 85 Peg BA may have a close, faint red dwarf companion 85 Peg BB within 2 AU from BA. The mass would be 11% solar mass. All components in the star system including Star A are smaller, cooler and less massive, luminous, and metallic than our Sun and 51 Pegasi.
References [edit]
- ^ a b c d van Leeuwen, F. (2007). "HIP 171". Hipparcos, the New Reduction. Retrieved 2010-12-20.
- ^ Soederhjelm (1999). "HIP 171". Visual binary orbits and masses. Retrieved 2012-11-22.
- ^ Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008). "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics". The Astrophysical Journal 687 (2): 1264–1293. arXiv:0807.1686. Bibcode:2008ApJ...687.1264M. doi:10.1086/591785.
External links [edit]
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In left column are stellar classes of primary members of star systems. Bold are systems containing at least one component with absolute magnitude of +8.5 or brighter. Italic are systems without known trigonometric parallax.
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| Bayer |
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| Flamsteed |
- 1
- 2
- 3
- 4
- 5
- 7
- 8 (ε, Enif)
- 9
- 10 (κ, Jih)
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22 (ν)
- 23
- 24 (ι)
- 25
- 26 (θ, Baham)
- 27 (π1)
- 28
- 29 (π2)
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
- 40
- 41
- 42 (ζ, Homam)
- 43 (ο)
- 44 (η, Matar)
- 45
- 46 (ξ)
- 47 (λ, Sadalpheretz)
- 48 (μ, Sadalbari)
- 49 (σ)
- 50 (ρ)
- 51
- 52
- 53 (β, Scheat)
- 54 (α, Markab)
- 55
- 56
- 57
- 58
- 59
- 60
- 61
- 62 (τ, Kerb)
- 63
- 64
- 65
- 66
- 67
- 68 (υ)
- 69
- 70
- 71
- 72
- 73
- 74
- 75
- 76
- 77
- 78
- 79
- 80
- 81 (φ)
- 82
- 83
- 84 (ψ)
- 85
- 86
- 87
- 88 (γ, Algenib)
- 89 (χ)
- 34 Vul
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| Nearby |
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