Ross 154
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Stern Ross 154 |
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| AladinLite | |||||||||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Sagittarius | ||||||||||||
| Right ascension | 18 h 49 m 49.36 s | ||||||||||||
| declination | -23 ° 50 ′ 10.5 ″ | ||||||||||||
| Apparent brightness | 10.50 likes | ||||||||||||
| Typing | |||||||||||||
| B − V color index | +1.74 | ||||||||||||
| U − B color index | +1.29 | ||||||||||||
| R − I index | +1.58 | ||||||||||||
| Spectral class | M3.5 Ve | ||||||||||||
| Variable star type | BY + UV | ||||||||||||
| Astrometry | |||||||||||||
| Radial velocity | (−10.5 ± 0.1) km / s | ||||||||||||
| parallax | (336.12 ± 0.06) mas | ||||||||||||
| distance | (9.69 ± 0.01) ly (2.97 ± 0.01) pc |
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| Visual absolute brightness M vis | 13.14 mag | ||||||||||||
| Proper movement | |||||||||||||
| Rec. Share: | (+639.35 ± 0.13) mas / a | ||||||||||||
| Dec. portion: | (−193.55 ± 0.11) mas / a | ||||||||||||
| Physical Properties | |||||||||||||
| Dimensions | (0.179 ± 0.004) M ☉ | ||||||||||||
| radius | (0.210 ± 0.006) R ☉ | ||||||||||||
| Luminosity |
0.00005 L ☉ |
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| Effective temperature | 2700 K | ||||||||||||
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Other names and catalog entries |
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Ross 154 is a tenth magnitude class red dwarf in the constellation Sagittarius , which is one of the stars closest to the Sun at a distance of about 9.7 light years . The star belongs to the class of flare stars and, as a variable star, bears the designation V1216 Sagittarii . Like many nearby dark stars, it was discovered by Frank Elmore Ross , who received the number 154 in his catalog, due to its high self-motion . The closest neighbor of this star is Barnard's star , which is 5.4 light years from Ross 154.
Web links
Individual evidence
- ↑ a b c d e f g h Ross 154. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed November 6, 2018 .
- ^ A b Cassy L. Davison, RJ White, TJ Henry, AR Riedel, W.-C. Jao, JI Bailey, SN Quinn, JR Cantrell, JP Subasavage, JG Winters: A 3D Search for Companions to 12 Nearby M Dwarfs . In: The Astronomical Journal . 149, No. 3, 2015, p. 106. arxiv : 1501.05012 . bibcode : 2015AJ .... 149..106D . doi : 10.1088 / 0004-6256 / 149/3/106 .
- ↑ V1216 Sgr. In: VSX. AAVSO , accessed November 6, 2018 .
- ↑ a b P. E. Kervella, F. Arenou, F. Mignard, F. Thévenin: Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly . In: Astronomy & Astrophysics . 623, p. A72. arxiv : 1811.08902 . bibcode : 2019A & A ... 623A..72K . doi : 10.1051 / 0004-6361 / 201834371 .