Upsilon Ceti
Template:Location mark Location of υ Ceti (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cetus[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 3.95[3] |
| Characteristics | |
| Spectral type | M0III[4] |
| U−B Template:Engvar | +1.90[3] |
| B−V Template:Engvar | +1.57[3] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[5] km/s |
| Proper motion (μ) | RA: +134.92[2] mas/yr Dec.: −24.59[2] mas/yr |
| Parallax (π) | 11.14±0.18 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −0.77[1] |
| Details[6] | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | Script error: No such module "val". dex |
| Age | Script error: No such module "val". Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| υ Cet, 59 Cet, BD−21°358, FK5 71, HD 12274, HIP 9347, HR 585, SAO 167471.[7] | |
| Database references | |
| SIMBAD | data |
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Upsilon Ceti, Latinized from υ Ceti, is a solitary[8] star in the equatorial constellation of Cetus. It is visible to the naked eye with an apparent visual magnitude of 3.95.[3] Based upon an annual parallax shift of 11.14 mas,[2] it is located about 293 light years from the Sun.
This star was designated Upsilon Ceti by Bayer and 59 Ceti by Flamsteed. Flamsteed also gave it the designation Upsilon2 Ceti to distinguish it from 56 Ceti, which he called Upsilon1. Flamsteed's superscripted designations, however, are not in general use today.[9]
For ancient Arabic astronomers, this star with η Cet (Deneb Algenubi), θ Cet (Thanih al Naamat), τ Cet and ζ Cet (Baten Kaitos), formed Al Naʽāmāt (النعامات), the Hen Ostriches[10] In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Sickle, refers to an asterism consisting of υ Ceti, 48 Ceti and 56 Ceti.[11] Consequently, the Chinese name for υ Ceti itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[12]
Upsilon Ceti is an evolved red giant star with a stellar classification of M0III and is listed as a standard for that class.[4] The star has previously been classified as K5/M0III,[13] an interesting example of one of the "gaps" in the Morgan-Keenan classification system, with K6-9 often not used for giant stars or used only to indicate a fraction of the way between K5 and M0.[4]
There is an 84% chance that it is on the red giant branch, or 16% to be on the horizontal branch. Stellar models based on the red giant branch status yield an estimated mass of around 126% of the Sun's mass and 54 times the radius of the Sun. This model indicates the star radiates around 550 times the solar luminosity from its outer atmosphere at an effective temperature of 3,822 K.[6]
References
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- ↑ a b Template:Cite XHIP
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- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b c Script error: No such module "Citation/CS1".
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- ↑ a b Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ 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.
- ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 10 日 Template:Webarchive
- ↑ Script error: No such module "citation/CS1".
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External links
- Script error: No such module "citation/CS1".
- Template:Cite simbad
- http://www.alcyone.de/cgi-bin/search.pl?object=HR0585 Template:Webarchive
- http://server3.wikisky.org/starview?object_type=1&object_id=714