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Epsilon Reticuli
Star in the constellation Reticulum / From Wikipedia, the free encyclopedia
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Epsilon Reticuli, Latinized from ε Reticuli, is a double star approximately 60 light-years away in the southern constellation of Reticulum. The brighter member is visible to the naked eye with an apparent visual magnitude of 4.44. The primary component is an orange subgiant, while the secondary is a white dwarf. The two stars share a common motion through space and hence most likely form a binary star system.[10] The brighter star should be easily visible without optical aid under dark skies in the southern hemisphere. In 2000, an extrasolar planet was confirmed to be orbiting the primary star in the system.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Reticulum |
Right ascension | 4h 16m 29.028s[1] |
Declination | –59° 18′ 07.76″[1] |
Apparent magnitude (V) | 4.44[2] / 12.5 |
Characteristics | |
Spectral type | K2 III-IV + DA3.3[3] |
U−B color index | +1.07[2] |
B−V color index | +1.08[2] |
Astrometry | |
Radial velocity (Rv) | +29.3[4] km/s |
Proper motion (μ) | RA: −47.785 mas/yr[1] Dec.: −167.806 mas/yr[1] |
Parallax (π) | 54.2286 ± 0.1019 mas[1] |
Distance | 60.1 ± 0.1 ly (18.44 ± 0.03 pc) |
Absolute magnitude (MV) | 0.87[5] |
Details | |
ε Reticuli A | |
Mass | 1.46±0.01[6] M☉ |
Radius | 3.18±0.08[6] R☉ |
Luminosity | 6.2±0.6[6] L☉ |
Surface gravity (log g) | 3.76±0.05[6] cgs |
Temperature | 4,961±28[6] K |
Metallicity [Fe/H] | 0.26±0.07[6] dex |
Rotational velocity (v sin i) | 2.07±0.42[6] km/s |
Age | 2.89±0.06[6] Gyr |
ε Reticuli B | |
Mass | 0.60±0.02[3] M☉ |
Radius | 0.0132±0.0002[3] R☉ |
Surface gravity (log g) | 7.98±0.02[3] cgs |
Temperature | 15,310±350[3] K |
Age | 1.5[3] Gyr |
Other designations | |
Epsilon Reticuli A: ε Ret, CPD−59°324, GJ 9153, HD 27442, HIP 19921, HR 1355, WDS J04165-5918A[8] | |
Epsilon Reticuli B: ε Reticuli B, CPD−59°324B, HD 27442B, WDS J04165-5918B, WD 0415-594[9] | |
Database references | |
SIMBAD | data |
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