Alpha Reticuli
Template:Location mark Location of α Reticuli (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Reticulum |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 3.315[2] |
| Characteristics | |
| Spectral type | G8 II-III[3] |
| U−B Template:Engvar | +0.63[4] |
| B−V Template:Engvar | +0.922[2] |
| R−I Template:Engvar | +0.659[2] |
| Astrometry | |
| Radial velocity (Rv) | +35.5[5] km/s |
| Proper motion (μ) | RA: +45.069 mas/yr[1] Dec.: +42.948 mas/yr[1] |
| Parallax (π) | 20.3431±0.1859 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)[1] |
| Absolute magnitude (MV) | Script error: No such module "val".[6] |
| Details | |
| Mass | Script error: No such module "val".[7] Template:Solar mass |
| Radius | Script error: No such module "val".[8] Template:Solar radius |
| Luminosity | Script error: No such module "val".[9] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[6] cgs |
| Temperature | Script error: No such module "val".[8] K |
| Metallicity [Fe/H] | +Script error: No such module "val".[6] dex |
| Rotational velocity (v sin i) | Script error: No such module "val".[7] km/s |
| Age | Script error: No such module "val".[7] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[10][11] | |
| Database references | |
| SIMBAD | data |
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Alpha Reticuli, Latinized from α Reticuli, also named Rhombus,[12] is the brightest star in the southern circumpolar constellation of Reticulum,[13] with an apparent visual magnitude of 3.3.[2] This appears to be a solitary star[14] located at a distance of 160 light-years from Earth.[1] Although it is bright enough to be seen with the naked eye, the declination of this star means that it is best viewed from the southern hemisphere and is only readily visible south of the Tropic of Cancer.[13]
Characteristics
This star has about three times the mass of the Sun and is about 300 million years old.[7] The spectrum of this star matches a stellar classification of G8 II-III,[3] with the luminosity class notation 'II-III' indicating it shows some traits of both a giant star and a bright giant. At this evolutionary stage, the surface has expanded to 13 times the radius of the Sun and the outer envelope has an effective temperature of 4,800 K.[8] X-ray emission has been detected from this star, with an estimated luminosity of 3 × 1029 erg s−1.[15]
Alpha Reticuli has a 12th-magnitude visual companion, CCDM J04144-6228B, at an angular separation of 48 arcseconds away along a position angle of 355°.[11] Since the two stars share a common proper motion across the celestial sphere, it is possible that Alpha Reticuli, rather than being solitary, may instead be the primary component of a binary star system with a projected separation of Script error: No such module "val". and an orbital period of, at least, 60,000 years.[13][16] They have a 94% possibility to be related.[16]
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".), means White Patches Attached, and it refers to an asterism consisting of α Reticuli and θ Doradus. Consequently, α Reticuli itself is known as Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[17]
The IAU Working Group on Star Names approved the name Rhombus for this star on 19 September 2024, after an obsolete name for the constellation Reticulum, and it is now so entered in the IAU Catalog of Star Names.[12]
References
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- ↑ a b c d e f Template:Cite Gaia DR3
- ↑ a b c d Script error: No such module "Citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ HR 1336, 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 September 4, 2008.
- ↑ Script error: No such module "citation/CS1".
- ↑ a b c Script error: No such module "Citation/CS1". Alpha Reticuli's database entry at VizieR.
- ↑ a b c d Script error: No such module "Citation/CS1". Alpha Reticuli's database entry at VizieR.
- ↑ a b c Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ * alf Ret -- Star in double system, database entry, SIMBAD. Accessed on line September 4, 2008.
- ↑ a b Entry 04144-6228, The Washington Double Star Catalog Template:Webarchive, United States Naval Observatory. Accessed on line September 4, 2008.
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b c Alpha Ret Template:Webarchive, Jim Kaler, Stars. Accessed on line September 4, 2008.
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ a b 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 27 日 Template:Webarchive
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