Eta Muscae
| Observation data ICRS )
| ||
|---|---|---|
| Constellation | Musca
| |
| Right ascension | 13h 15m 14.94123s[2] | |
| Declination | −67° 53′ 40.5276″[2] | |
| Apparent magnitude (V) | 4.79[3] | |
| Characteristics | ||
| Spectral type | B8V + sim. + K9.4XR? + A0p[4] or B7III + B7III[5] | |
| B−V color index | −0.078±0.003[3] | |
| Variable type | eclipsing binary | |
| Absolute magnitude (MV) | −0.81[6] | |
Semi-amplitude (K1)(primary) | 145.35±0.20 km/s | |
| Semi-amplitude (K2) (secondary) | 145.38±0.20 km/s | |
| Details Rotational velocity (v sin i)44±2 km/s | | |
| Database references | ||
| SIMBAD | data | |
Eta Muscae is a multipleSco OB2 stellar association of co-moving stars.[11]
The two main components of this system form a double-lined
eclipsing binary with a spectral type of B8V and a brightness that dips by 0.05 magnitude once per orbit.[13] This pair consists of two components of similar mass and type.[4]
Further away from the primary system are stars of magnitude 7.3 and 10, designated Eta Muscae B and C. It is unclear if these stars are gravitationally–bound to the main pair. Evidence for an additional component has been found with a 30-year cycle in the orbital behavior of the main pair.[9] The data suggests an orbital eccentricity of 0.29 for this suspected component, Eta Muscae D.[14]
References
- ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
- ^ S2CID 18759600.
- ^ S2CID 119257644.
- ^ S2CID 14878976.
- Bibcode:1970MmRAS..72..233H.
- ^ S2CID 17507782.
- ^ S2CID 119238300. e024.
- ^ "eta Mus". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-26.
{{cite web}}: CS1 maint: postscript (link) - ^ Bibcode:2011IBVS.6004....1B. Archived from the originalon December 21, 2013.
- Bibcode:2000IBVS.4827....1M.
- ^ Bibcode:2003ASSL..299P...8H.
- .
- S2CID 17089387.
- Bibcode:2016IBVS.6171....1B.