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Epsilon Volantis

ε Volantis
Location of ε Volantis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Volans
Right ascension 08h 07m 55.7945s[1]
Declination −68° 37′ 01.433″[1]
Apparent magnitude (V) +4.33[2]
Characteristics
Spectral type B5 III[3] (B6 IV + B8 + A2 V + A2 V)[4]
B−V color index −0.12[2]
Astrometry
Radial velocity (Rv)+9.6[5] km/s
Proper motion (μ) RA: −29.781(166)[1] mas/yr
Dec.: 29.887(177)[1] mas/yr
Parallax (π)5.0597 ± 0.1248 mas[1]
Distance640 ± 20 ly
(198 ± 5 pc)
Absolute magnitude (MV)−1.82[6]
Details[7]
ε Vol Aa
Surface gravity (log g)3.62 cgs
Temperature14,348 K
Rotational velocity (v sin i)1 km/s
ε Vol Ab
Surface gravity (log g)4.07 cgs
Temperature10,772 K
Rotational velocity (v sin i)7 km/s
Other designations
ε Vol, CPD−68°736, HD 68520, HIP 39794, HR 3223, SAO 250128, WDS J08079–6837[8]
Database references
SIMBADdata

Epsilon Volantis, Latinized from ε Volantis, is a quadruple star system[4] in the southern constellation Volans. This star is at the center of the constellation of Volans and connects the "wings" of the constellation. Based upon parallax measurements, is roughly 640 light years from Earth.

The primary component, Epsilon Volantis A, is a spectroscopic binary.[9] It is classified a blue-white B-type giant star and has an apparent magnitude of +4.35. (The individual components are classified as B6IV and B8.)[4] The binary system has an orbital period of 14.1683 days. The binary's companion, Epsilon Volantis B, is 6.05 arcseconds away and has an apparent magnitude of +8.1. It too is a spectroscopic binary, consisting of two A-type main sequence stars with stellar classifications of A2 V and an orbital period of "a few days".[4]

  1. ^ a b c d e Cite error: The named reference Gaia EDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Cousins1977 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Veramendi2014 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference wilson1953 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ Kovalev, Mikhail; Straumit, Ilya (2023). "Application of the binary spectral model to high-resolution spectra. First estimation of the fundamental parameters for HD 20784". Monthly Notices of the Royal Astronomical Society. 523 (3): 3741–3748. arXiv:2210.00863. Bibcode:2023MNRAS.523.3741K. doi:10.1093/mnras/stad1667.
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Medici2000 was invoked but never defined (see the help page).

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