58 Eridani
Star in the constellation Eridanus
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58 Eridani is a main-sequence star in the constellation Eridanus. It is a solar analogue,[11] having similar physical properties to the Sun. The star has a relatively high proper motion across the sky, and it is located 43 light years distant. It is a probable member of the IC 2391 moving group of stars that share a common motion through space.[9]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 04h 47m 36.29170s[1] |
| Declination | −16° 56′ 04.0405″[1] |
| Apparent magnitude (V) | 5.47 - 5.51[2] |
| Characteristics | |
| Evolutionary stage | main sequence[1] |
| Spectral type | G1.5 V CH-0.5[3] |
| U−B color index | +0.13[4] |
| B−V color index | +0.64[4] |
| Variable type | BY Dra[2] |
| Astrometry | |
| Radial velocity (Rv) | 21.60±0.12[1] km/s |
| Proper motion (μ) | RA: +130.264[1] mas/yr Dec.: +169.338[1] mas/yr |
| Parallax (π) | 75.5289±0.0539 mas[1] |
| Distance | 43.18 ± 0.03 ly (13.240 ± 0.009 pc) |
| Absolute magnitude (MV) | 4.87[5] |
| Details | |
| Mass | 1.053±0.007[6] M☉ |
| Radius | 1.00[1] R☉ |
| Luminosity | 0.97±0.05[1] L☉ |
| Surface gravity (log g) | 4.50±0.02[7] cgs |
| Temperature | 5,820±5.7[8] K |
| Metallicity [Fe/H] | 0.030±0.007[7] dex |
| Rotation | 7.6 days[9] |
| Rotational velocity (v sin i) | 3.37±0.11[7] km/s |
| Age | 600[10] Myr |
| Other designations | |
| 58 Eri, IX Eri, BD−17°954, GJ 177, HD 30495, HIP 22263, HR 1532, SAO 149888, LTT 2088 | |
| Database references | |
| SIMBAD | data |
Characteristics
This is a BY Draconis variable with the designation IX Eridani, which ranges in magnitude from 5.47 down to 5.51 with a period of 11.3 days.[2] The X-ray emissions from this star's corona indicate an age of less than a billion (109) years,[13] compared to 4.6 billion for the Sun, so it is still relatively young for a star of its mass. Starspot activity has also been detected, which varies from year to year.
A circumstellar disc of dust particles has been detected in orbit around 58 Eridani.[14]