12 Aquilae
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Template:Location mark Location of 12 Aquilae (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 4.02[2] |
| Characteristics | |
| Spectral type | K1 III[3] |
| U−B Template:Engvar | +1.04[2] |
| B−V Template:Engvar | +1.104[4] |
| R−I Template:Engvar | 0.54 |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[4] km/s |
| Proper motion (μ) | RA: Script error: No such module "val". mas/yr[1] Dec.: Script error: No such module "val". mas/yr[1] |
| Parallax (π) | 21.5669±0.2199 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 0.726[5] |
| Details | |
| Mass | Script error: No such module "val".[6] Template:Solar mass |
| Radius | Script error: No such module "val".[6] Template:Solar radius |
| Luminosity | Script error: No such module "val".[7] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[6] cgs |
| Temperature | Script error: No such module "val".[7] K |
| Metallicity [Fe/H] | Script error: No such module "val".[6] dex |
| Rotational velocity (v sin i) | 3.6[4] km/s |
| Age | Script error: No such module "val".[7] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| i Aquilae, BD−05°4840, HD 176678, HIP 93429, HR 7193, SAO 142931[8] | |
| Database references | |
| SIMBAD | data |
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12 Aquilae (abbreviated 12 Aql) is a star in the equatorial constellation of Aquila. 12 Aquilae has the Bayer designation of i Aquilae and is most easily recognized in the sky being next to the brighter star λ (lambda) Aquilae.
In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Market Officer, refers to an asterism consisting of 12 Aquilae, α Scuti, δ Scuti, ε Scuti, β Scuti, η Scuti, λ Aquilae, 15 Aquilae and 14 Aquilae.[9] Consequently, 12 Aquilae itself is known as Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)
This star has an apparent visual magnitude of 4.02,[2] which is bright enough to be seen with the naked eye, although, according to the Bortle Dark-Sky Scale, it is a challenge to view from the inner city. Based upon an annual parallax shift of 21.57 mas,[1] the distance to this star is Script error: No such module "convert". with a margin of error of one light-year. This is an evolved giant star of stellar class K1 III.[3] It has 12 times the radius of the Sun[6] and shines with 58 times the Sun's luminosity. This energy is being radiated from its outer atmosphere at an effective temperature of 4,662 K,[6] giving it the cool orange hue of a K-type star.[10]
References
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- ↑ a b c d e Template:Cite DR3
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ a b c d e f Script error: No such module "citation/CS1". 12 Aquilae's database entry at VizieR.
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
- ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
- ↑ Script error: No such module "citation/CS1".
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