Beta Ceti
00h 43m 35.37090s, −17° 59′ 11.7827″  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 00h 43m 35.37090s[1] |
| Declination | −17° 59′ 11.7827″[1] |
| Apparent magnitude (V) | 2.02[2] |
| Characteristics | |
| Spectral type | K0 III[3] |
| U−B color index | +0.88[2] |
| B−V color index | +1.01[2] |
| Variable type | Suspected[4] |
| Absolute magnitude (MV) | −0.13[6] |
| Details | |
Gyr | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
Beta Ceti (β Ceti, abbreviated Beta Cet, β Cet), officially named Diphda /ˈdɪfdə/,[13] is the brightest star in the constellation of Cetus. Although designated 'beta', it is actually brighter than the 'alpha' star in the constellation, Menkar, by half a magnitude. This orange giant is easy to identify due to its location in an otherwise dark section of the celestial sphere. Based on parallax measurements, it lies at an estimated distance of 96.3 light-years (29.5 parsecs) from the Sun.[1]
Properties
Diphda has an
The
This star displays flaring activity that results in random outbursts that increase the luminosity of the star over intervals lasting several days. This is a much longer duration than for comparable solar flare activity on the Sun, which typically last for periods measured in hours.[14] In 2005, a relatively high rate of X-ray emission was detected with the XMM-Newton space observatory.[7] It is emitting about 2,000 times the X-ray luminosity of the Sun, allowing the star to be imaged with the Chandra X-ray Observatory.[11]
Nomenclature
β Ceti (Latinised to Beta Ceti) is the star's Bayer designation.
It bore the traditional names Diphda and Deneb Kaitos /ˌdɛnɛb ˈkeɪtɒs/.[17] Diphda is Arabic for 'frog', from the phrase ضفدع الثاني aḍ-ḍifdaʿ aṯ-ṯānī 'the second frog' (the first frog' is Fomalhaut); Deneb Kaitos is from الذنب القيتوس الجنوب Al Dhanab al Ḳaiṭos al Janūbīyy 'southern tail of Cetus'.[18]
In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[19] to catalogue and standardize proper names for stars. The WGSN approved the name Diphda for this star on 21 August 2016 and it is now so entered in the IAU Catalog of Star Names.[20]
In
Namesake
References
- ^ S2CID 18759600.
- ^ Bibcode:1966CoLPL...4...99J.
- ^ S2CID 55727428.
- Bibcode:2009yCat....102025S.
- Bibcode:1999VeARI..35....1W.
- Bibcode:1999A&A...343..222E.
- ^ Bibcode:2005ESASP.560..931S.
- ^ S2CID 17171848.
- ^ .
- Centre de Données astronomiques de Strasbourg. Retrieved 2010-09-30.
- ^ Harvard-Smithsonian Center for Astrophysics. February 20, 2009. Retrieved 2011-12-28.
- Centre de Données astronomiques de Strasbourg. Retrieved 2010-09-30.
- ^ "International Astronomical Union | IAU". www.iau.org. Retrieved 2022-06-15.
- ^ doi:10.1086/337971.
- Commonwealth Scientific and Industrial Research Organisation. December 21, 2004. Archived from the originalon 2012-03-18. Retrieved 2012-01-16.
- University of Illinois. Retrieved 2010-09-30.
- ISBN 978-1-931559-44-7.
- ISBN 0-486-21079-0. Retrieved 2010-12-12.
- ^ "IAU Working Group on Star Names (WGSN)". International Astronomical Union. Retrieved 22 May 2016.
- ^ "IAU Catalog of Star Names". Retrieved 28 July 2016.
- ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 9 日
- ^ Star Name - R.H. Allen p. 160
