82 Eridani, a yellow main-sequence star in Eridanus
82 Eridani is a yellow main-sequence star in the constellation Eridanus. At 19.7 light years away, it shines at an apparent visual magnitude of 4.26.
82 Eridani (HIP 15510)
82 Eridani is a yellow main-sequence star in the constellation Eridanus. At 19.7 light years away, it shines at an apparent visual magnitude of 4.26. The star's age is estimated to be 11.3 billion years but is certainly no less than 3.6 billion years. The iron abundance of 82 Eridani is -0.35 (44.7% of the Sun). It is moving through the Galaxy at a speed of 125.1 km/s relative to the Sun. It came closest to the Sun 33,000 years ago when it had brightened to magnitude 3.53 from a distance of 14.1 light years. 82 Eridani has three confirmed planets know to date (early 2012).
Sky position: RA 3h 19.9m, Dec -43° 4.2'
Common designations: e Eridani, 82 Eridani, HIP 15510, HD 20794, Gliese 139
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Brightest stars in Eridanus:
(list all)
| Rank | Mag. | Star |
| 15 | 3.97 | 43 Eridani |
| 16 | 4.01 | Mu Eridani |
| 17 | 4.04 | Beid |
| 18 | 4.08 | Tau-3 Eridani |
| 19 | 4.11 | Iota Eridani |
| 20 | 4.17 | g Eridani |
| 21 | 4.22 | Tau-6 Eridani |
| 22 | 4.24 | Kappa Eridani |
| 23 | 4.25 | Lambda Eridani |
24
| 4.26
) 82 Eridani
| Rank | Mag. | Star |
| 25 | 4.26 | Tau-5 Eridani |
| 26 | 4.30 | f Eridani |
| 27 | 4.32 | 54 Eridani |
| 28 | 4.36 | Omega Eridani |
| 29 | 4.43 | Pi Eridani |
| 30 | 4.43 | Keid |
| 31 | 4.46 | 32 Eridani |
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Galactic Orbit of 82 Eridani
(compared to the Sun)
E
ccentricity: 62.6% vs. 16.0%Angle φ : -161.8°vs. 26.0°
Semi-major axis : 4,933 pc vs. 8,686 pc
Semi-minor axis: 3,845 pc vs. 8,574 pc
Focus-to-center
: 3,090 pcvs. 1,388 pcSemilatus rectum : 2,997 pc vs. 8,464 pc
Perigalacticon: 1,843 pc vs. 7,297 pc
Apogalacticon
: 8,023 pcvs. 10,074 pcSome Tabulated XHIP Data for 82 Eridani
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 49.97176989° ±0.15 mas | 3,038.33 ±0.19 mas/yr. |
| Declination: | -43.07154908° ±0.15 mas | 726.72 ±0.20 mas/yr. |
| Galactic Longitude: | 250.75281143° | -1,524.79 mas/yr. |
| Galactic Latitude: | -56.08349351° | 2,726.65 mas/yr. |
Parallax: 165.47 ± 0.19 mas
Spectrography
Spectral Type: G8V 2006AJ....132..161G.
Radial Velocity: 87.40 ±0.51 km/s [A rating] 2005ApJS..159..141V.
Iron Abundance [Fe/H]:
-0.35 ±0.01 dex
2011A&A...530A.138C, 2008A&A...487..373S, 2007A&A...465..271R, 2006MNRAS.370..163B, 2005ApJS..161..444T, 2005ApJS..159..141V, 2005A&A...433..185B, 2004A&A...420..183A, 2004A&A...415.1153S, 2001A&A...373.1019S, 1994A&A...287..191P, 1989A&A...208..171G, 1986A&A...160..264F.
Photometry
| band | magnitude | Abs. Mag. |
| U | ||
| B | 4.97 | 6.06 |
| V | 4.26 | 5.35 |
| R | ||
| I | 3.47 | 4.56 |
| J | 3.03 | 4.13 |
| H | 2.71 | 3.80 |
| K | 2.64 | 3.73 |
B-V: +0.71 V-I: +0.79
Derivations
Heliocentric distance: 6.04 pc (0.1% margin of error)
Galactocentric distance: 7,401 pc
Transverse velocity: 89.5 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | -1.1 pc | -3.2 pc | -5.0 pc |
| Velocity (U, V, W) | -78.7 km/s | -92.8 km/s | -28.9 km/s |