Omega Sagittarii
ω Sagittarii
Observation data
Epoch J2000.0 Equinox J2000.0 (ICRS) |
| Constellation |
Sagittarius |
| Right ascension |
19h 55m 50.3577s[1] |
| Declination |
−26° 17′ 58.223″[1] |
| Apparent magnitude (V) |
4.70[1] |
| Characteristics |
| Spectral type |
G5IV[1] |
| U−B color index |
+0.32[2] |
| B−V color index |
+0.75[2] |
| R−I color index |
+0.37[2] |
| Astrometry |
|
| Radial velocity (Rv) |
−21.0 ± 0.9[1] km/s |
| Proper motion (μ) |
RA: 203.96[1] mas/yr
Dec.: 74.40[1] mas/yr |
| Parallax (π) |
42.03 ± 0.94[1] mas |
| Distance |
78 ± 2 ly
(23.8 ± 0.5 pc) |
| Absolute magnitude (MV) |
2.82[3] |
|
| Details |
|
| Radius |
1.1[4] R☉ |
| Temperature |
5400[5] K |
| Metallicity |
[Fe/H] = 0.00[5] |
| Rotational velocity (v sin i) |
2[5] km/s |
| Age |
2.9 (2.8 to 3.0) × 109[5] years |
|
| Other designations |
ω Sgr, Omega Sagittarii, Omega Sgr, 58 Sagittarii, 58 Sgr, CD−26 14637, CPD−26 6880, GC 27583, GJ 770.1, GJ 9673, HD 188376, HIP 98066, HR 7597, LTT 7872, NLTT 48428, PPM 270451, SAO 188722. [1] |
| Database references |
| SIMBAD |
data |
Omega Sagittarii (Omega Sgr, ω Sagittarii, ω Sgr) is a G-type subgiant star in the constellation of Sagittarius.[1] It has an apparent visual magnitude of approximately 4.70. It is the northeast corner of the asterism called the Terebellum and at approximately 78 light years from Earth, it is the nearest of the four stars in this asterism.[1]
References
- ^ a b c d e f g h i j k LTT 7872 -- High proper-motion Star, database entry, SIMBAD. Accessed on line November 19, 2009.
- ^ a b c HR 7597, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line November 19, 2009.
- ^ From apparent magnitude and parallax.
- ^ HD 188376, database entry, Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition, L. E. Pasinetti-Fracassini, L. Pastori, S. Covino, and A. Pozzi, CDS ID II/224. Accessed on line November 19, 2009.
- ^ a b c d HD 188376, database entry, The Geneva-Copenhagen Survey of Solar neighbourhood, J. Holmberg et al., 2007, CDS ID V/117A. Accessed on line November 19, 2009.
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| Bayer |
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| Flamsteed |
- 3
- 4
- 6
- 7
- 9
- 10 (γ², Alnasl)
- 11
- 13 (μ, Polis)
- 14
- 15
- 16
- 17
- 18
- 19 (δ, Kaus Media)
- 20 (ε, Kaus Australis)
- 21
- 22 (λ, Kaus Borealis)
- 24
- 25
- 26
- 27 (φ, Nanto)
- 28
- 29
- 30
- 32 (ν¹, Ain al Rami)
- 33
- 34 (σ, Nunki)
- 35 (ν²)
- 36 (ξ¹)
- 37 (ξ²)
- 38 (ζ, Ascella)
- 39 (ο)
- 40 (τ)
- 41 (π, Albaldah)
- 42 (ψ)
- 43 (d)
- 44 (ρ¹)
- 45 (ρ²)
- 46 (υ)
- 47 (χ¹)
- 48 (χ²)
- 49 (χ³)
- 50
- 51 (h¹)
- 52 (h²)
- 53
- 54 (e¹)
- 55 (e²)
- 56 (f)
- 57
- 58 (ω)
- 59 (b¹)
- 60 (A)
- 61 (g)
- 62 (c)
- 63
- 65
- 63 Oph
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| Other |
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