Iota Aquilae
Template:Location mark Location of ι Aquilae (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 4.364[3] |
| Characteristics | |
| Spectral type | B5 III[4] or B6 IV[5] |
| U−B Template:Engvar | −0.428[3] |
| B−V Template:Engvar | −0.083[3] |
| R−I Template:Engvar | −0.08[6] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[2] km/s |
| Proper motion (μ) | RA: Script error: No such module "val". mas/yr[2] Dec.: Script error: No such module "val". mas/yr[2] |
| Parallax (π) | 5.6673±0.1947 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | Script error: No such module "val".[1] |
| Details | |
| Mass | Script error: No such module "val".[7] Template:Solar mass |
| Radius | Script error: No such module "val".[8] Template:Solar radius |
| Luminosity | 851[7] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[7] cgs |
| Temperature | Script error: No such module "val".[8] K |
| Metallicity [Fe/H] | Script error: No such module "val".[1] dex |
| Rotational velocity (v sin i) | 55[9] km/s |
| Age | 100 ± 8[7] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[10] | |
| Database references | |
| SIMBAD | data |
Script error: No such module "Check for unknown parameters".
Iota Aquilae is a star in the equatorial constellation of Aquila. Its identifier is a Bayer designation that is Latinized from ι Aquilae, and abbreviated Iota Aql or ι Aql. The star has the traditional name Al Thalimain, pronounced Template:IPAc-en, which it shares with λ Aquilae. The name is derived from the Arabic term الظليمین al-ẓalīmayn meaning "The Two Ostriches".[11] With an apparent visual magnitude of 4.364,[3] this star is bright enough to be seen with the naked eye. Based upon an annual parallax shift of Script error: No such module "val".,[2] it is located at a distance of around Script error: No such module "convert". from Earth.[2] The visual magnitude of the star is diminished by 0.15 from extinction caused by intervening gas and dust.[7]
In 1968, this star was assigned a stellar classification of B5III,[4] which suggests it has exhausted its hydrogen supply at its core and evolved into a blue giant. However, stellar models from 2002 indicate it is around 100 million years old and has thus far spent 91% of its allotted lifetime on the main sequence.[7] In 2024, a study of standard stars suggested that Iota Aquilae be classified as B6 IV, matching a subgiant star.[5]
Iota Aquilae has nearly five times the mass of the Sun[7] and eight times the Sun's radius.[8] It is emitting 851 times the luminosity of the Sun from its outer atmosphere[7] at an effective temperature of 14,500 K,[12] giving it the blue-white hue of a B-type star.[13] The projected rotational velocity of this star is 55 km/s.[9]
Nomenclature
In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Right Flag, refers to an asterism consisting of ι Aquilae, μ Aquilae, σ Aquilae, δ Aquilae, ν Aquilae, 42 Aquilae, HD 184701, κ Aquilae and 56 Aquilae.[14] Consequently, the Chinese name for ι Aquilae itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[15]
This star, together with η Aql, θ Aql, δ Aql, κ Aql and λ Aql were once part of the obsolete constellation Antinous.[16]
References
<templatestyles src="Reflist/styles.css" />
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ a b c d e f g Template:Cite DR3
- ↑ 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".
- ↑ Script error: No such module "citation/CS1".
- ↑ a b c d e f g h Script error: No such module "citation/CS1".
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ 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".
- ↑ Script error: No such module "citation/CS1".
Script error: No such module "Check for unknown parameters".