30 Vulpeculae
Template:Location mark Location of 30 Vulpeculae (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 4.91[2] |
| Characteristics | |
| Spectral type | K1 III[3] |
| U−B Template:Engvar | +1.18[2] |
| B−V Template:Engvar | +1.19[2] |
| Astrometry | |
| Radial velocity (Rv) | +30.00[4] km/s |
| Proper motion (μ) | RA: −30.988[1] mas/yr Dec.: −184.648[1] mas/yr |
| Parallax (π) | 9.3255±0.1537 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −0.07[5] |
| Orbit[6] | |
| Period (P) | Script error: No such module "val". |
| 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 | |
| Mass | 1.55[7] 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) | 2.47[8] cgs |
| Temperature | Script error: No such module "val".[1] K |
| Metallicity [Fe/H] | −0.10[5] dex |
| Rotational velocity (v sin i) | 1.5[9] km/s |
| Age | 4.20[7] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[10] | |
| Database references | |
| SIMBAD | data |
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30 Vulpeculae is a binary star system in the northern constellation of Vulpecula, located mid-way between Epsilon Cygni and a diamond-shaped asterism in Delphinus. It is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4.91.[2] The system is located approximately 350 light years away from the Sun based on parallax,[1] and is drifting further away with a mean radial velocity of +30 km/s.[4] The system has a relatively high proper motion, traversing the celestial sphere at the rate of 0.186 arc seconds per annum.[11]
The variable radial velocity of this system was announced in 1922 by W. W. Campbell. It is a single-lined spectroscopic binary system with an orbital period of Script error: No such module "convert". and an eccentricity of 0.38. The a sin i value is Script error: No such module "convert"., where a is the semimajor axis and i is the orbital inclination. This provides a lower bound on the true semimajor axis.[6]
The visible component is an aging giant star with a stellar classification of K1 III[3] and an estimated age of 4.20[7] billion years old. Having exhausted the supply of hydrogen at its core, the star has expanded to 22[1] times the Sun's radius. It has 1.55[7] times the mass of the Sun and is radiating 173[1] times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,498 K.[1]
References
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- ↑ a b c d e f g h i j k l Template:Cite Gaia DR2
- ↑ a b c d Script error: No such module "Citation/CS1".
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ a b Script error: No such module "Citation/CS1". Vizier catalog entry
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ a b c d Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Template:Cite simbad
- ↑ Script error: No such module "Citation/CS1".
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