Iota Apodis
Template:Location mark Location of ι Apodis (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Apus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 5.41[2] (5.90/6.46)[3] |
| Characteristics | |
| Spectral type | B9 V + B9.5 V[3] |
| U−B Template:Engvar | −0.23[2] |
| B−V Template:Engvar | −0.04[2] |
| Astrometry | |
| Radial velocity (Rv) | −4.3[4] km/s |
| Proper motion (μ) | RA: −1.881 mas/yr[1] Dec.: −11.363 mas/yr[1] |
| Parallax (π) | 3.1948±0.1853 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Orbit[5] | |
| Period (P) | Script error: No such module "val". yr |
| Semi-major axis (a) | Script error: No such module "val".″ |
| Eccentricity (e) | Script error: No such module "val". |
| Inclination (i) | Script error: No such module "val".° |
| Longitude of the node (Ω) | Script error: No such module "val".° |
| Argument of periastron (ω) (secondary) | Script error: No such module "val".° |
| Details | |
| ι Aps A | |
| Mass | Script error: No such module "val".[5] Template:Solar mass |
| ι Aps B | |
| Mass | Script error: No such module "val".[5] Template:Solar mass |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[6] | |
| Database references | |
| SIMBAD | data |
Script error: No such module "Check for unknown parameters".
Iota Apodis is a binary star[3] system in the southern circumpolar constellation of Apus. Its identifier is a Bayer designation that is Latinized from ι Apodis, and abbreviated Iot Aps or ι Aps, respectively. This system is a faint target at an apparent visual magnitude of 5.41,[2] but still visible to the naked eye from suitably dark skies. The distance to this star can be gauged from parallax measurements, yielding an estimate of Script error: No such module "convert". with a 6% margin of error.[1] The system is drifting closer with a heliocentric radial velocity of −4.3 km/s.[4]
The dual nature of this system was announced by W. S. Finsen in 1960, who reported an angular separation of Script error: No such module "val"..[7] Their orbit has an angular separation of 0.091 arcseconds[3] with an estimated orbital period of 59.32 years and an eccentricity (ovalness) of 0.17.[5] Both stars are B-type main sequence stars, which indicates they shine with a blue-white hue.[8] The brighter component has a stellar classification of B9 V and an apparent magnitude 5.90, while the second member is a B9.5 V star with a magnitude of 6.46. They are about 3.89 and 3.45 times as massive as the Sun, respectively.[5]
Naming
In Chinese caused by adaptation of the European southern hemisphere constellations into the Chinese system, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Exotic Bird, refers to an asterism consisting of ι Apodis, ζ Apodis, β Apodis, γ Apodis, δ Octantis, δ1 Apodis, η Apodis, α Apodis and ε Apodis. Consequently, ι Apodis itself is known as Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[9]
References
<templatestyles src="Reflist/styles.css" />
- ↑ a b c d e Template:Cite Gaia DR3
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b c d e Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
- ↑ Script error: No such module "citation/CS1".
- ↑ 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 29 日 Template:Webarchive
Script error: No such module "Check for unknown parameters".