Omega Sagittarii
Template:Location mark Location of ω Sagittarii (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 4.70[2] |
| Characteristics | |
| Evolutionary stage | subgiant |
| Spectral type | G5 IV[3] |
| U−B Template:Engvar | +0.32[4] |
| B−V Template:Engvar | Script error: No such module "val".[1] |
| R−I Template:Engvar | +0.37[4] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[1] km/s |
| Proper motion (μ) | RA: 203.96[5] mas/yr Dec.: 74.40[5] mas/yr |
| Parallax (π) | 42.7159±0.5538 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 2.64[2] |
| Orbit[6] | |
| Period (P) | Script error: No such module "val". |
| Semi-major axis (a) | ≥ Script error: No such module "convert". |
| Eccentricity (e) | Script error: No such module "val". |
| Periastron epoch (T) | Script error: No such module "val". |
| Argument of periastron (ω) (secondary) | Script error: No such module "val".° |
| Semi-amplitude (K1) (primary) | Script error: No such module "val". km/s |
| Details[7] | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val".[1] Template:Solar radius |
| Luminosity | Script error: No such module "val".[1] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | Script error: No such module "val". dex |
| Rotational velocity (v sin i) | 5.6[8] km/s |
| Age | Script error: No such module "val". Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[9] | |
| Database references | |
| SIMBAD | data |
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Omega Sagittarii, which is Latinized from ω Sagittarii, is a binary star system in the constellation of Sagittarius,[9] near the eastern constellation border with Capricornus. It is formally named Terebellum Script error: No such module "IPAc-en"..[10][11] This system has a yellow hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.70.[2] It is located at a distance of 76 light years away from the Sun based on parallax,[1] and is drifting closer with a radial velocity of −16 km/s.[1] The position of this star near the ecliptic means it is subject to lunar occultations.[12]
The members of this system orbit each other with a period of Script error: No such module "convert". and an eccentricity of 0.82.[6] The visible component is a G-type subgiant star with a stellar classification of G5 IV.[3] It is three[7] billion years old and is spinning with a projected rotational velocity of 5.6 km/s.[8] The star is radiating seven[1] times the luminosity of the Sun from its photosphere at an effective temperature of 5,499 K.[7]
Nomenclature
ω Sagittarii (Latinised to Omega Sagittarii) is the star's Bayer designation.
This star, together with 60, 62 and 59 Sagittarii, formed the asterism called "Terebellum".[13] According to a 1971 NASA memorandum, Terebellum was originally the title for four stars: Omega Sagittarii as Terebellum I, 59 Sagittarii as Terebellum II, 60 Sagittarii as Terebellum III and 62 Sagittarii as Terebellum IV .[14] In 2016, the IAU organized a Working Group on Star Names (WGSN)[15] to catalog and standardize proper names for stars. The WGSN approved the name Terebellum for Omega Sagittarii on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.[10]
In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Dog Territory, refers to an asterism consisting of Omega Sagittarii, 60 Sagittarii, 62 Sagittarii and 59 Sagittarii. Consequently, the Chinese name for Omega Sagittarii itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[16]
References
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- ↑ a b c d e f g h i j Template:Cite DR2
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- ↑ a b Script error: No such module "citation/CS1". ID V/50. HR 7597 Script error: No such module "webarchive"., database entry. Accessed on line November 19, 2009.
- ↑ a b Script error: No such module "citation/CS1".
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- ↑ a b c Script error: No such module "citation/CS1".
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- ↑ a b Template:Cite simbad
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
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- ↑ Script error: No such module "citation/CS1".
- ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 2 日 Script error: No such module "webarchive".
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