Beta Delphini

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Template:Short description

β Delphini
Template:Location mark
Location of β Delphini (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Delphinus
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) Template:Val[2] (4.11 + 5.01)[3]
Characteristics
Spectral type F5 III + F5 IV[4]
B−V Template:Engvar A: Template:Val
B: Template:Val[1]
Astrometry
Beta Delphini A
Proper motion (μ) RA: +118.09[1] mas/yr
Dec.: -48.06[1] mas/yr
Parallax (π)32.33±0.47 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)Template:Val[2]
Beta Delphini B
Absolute magnitude (MV)Template:Val[2]
Orbit[3]
Period (P)26.660 yr
Semi-major axis (a)0.440″
Eccentricity (e)0.36
Inclination (i)61°
Longitude of the node (Ω)177°
Periastron epoch (T)Template:Val
Argument of periastron (ω)
(secondary)		349°
Semi-amplitude (K1)
(primary)		7.6[5] km/s
Details
Beta Delphini A
MassTemplate:Val[2] Template:Solar mass
Luminosity24[6] Template:Solar luminosity
Surface gravity (log g)3.50[6] cgs
TemperatureTemplate:Val[6] K
Metallicity [Fe/H]–0.05[2] dex
Rotational velocity (v sin i)49.8[6] km/s
AgeTemplate:Val[2] Gyr
Beta Delphini B
MassTemplate:Val[2] Template:Solar mass
Luminosity8[7] Template:Solar luminosity
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Rotanev, Rotanen, Venator, β Del, Beta Delphini, Beta Del, 6 Delphini, 6 Del, BD+14 4369, HD 196524, HIP 101769, HR 7882, SAO 106316, WDS 20375+1436AB[8][9][10]
Database references
SIMBADdata

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Beta Delphini (β Delphini, abbreviated Beta Del, β Del) is a binary star in the constellation of Delphinus. It is the brightest star in Delphinus.

The two components of the system are designated Beta Delphini A (officially named Rotanev Template:IPAc-en, which is historically the name of the system)[11][12] and B.

Nomenclature

β Delphini (Latinised to Beta Delphini) is the binary's Bayer designation. The designations of the two components as Beta Delphini A and B derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[13]

Beta Delphini bore an historical name, Rotanev, which arose as follows: Niccolò Cacciatore was the assistant to Giuseppe Piazzi, and later his successor as Director of the Palermo Observatory. The name first appeared in Piazzi's Palermo Star Catalogue. When the Catalogue was published in 1814, the unfamiliar names Sualocin and Rotanev were attached to Alpha and Beta Delphini, respectively. Eventually the Reverend Thomas Webb, a British astronomer, puzzled out the explanation.[14] Cacciatore's name, Nicholas Hunter in English translation, would be Latinized to Nicolaus Venator. Reversing the letters of this construction produces the two names. They have endured, the result of Cacciatore's little practical joke of naming the two after himself. How Webb arrived at this explanation 45 years after the publication of the catalogue is still a mystery.[15]

In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[16] to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[17] It approved the name Rotanev for the component Beta Delphini A on 12 September 2016 and it is now so included in the List of IAU-approved Star Names.[12]

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Good Gourd, refers to an asterism consisting of Beta Delphini, Alpha Delphini, Gamma2 Delphini, Delta Delphini, and Zeta Delphini.[18]

Properties

Beta Delphini was found to be a binary star system in 1873 by the American astronomer S. W. Burnham.[19] The system consists of a pair of F-type stars that orbit each other with a period of 26.66 years and an eccentricity of 0.36. The plane of the orbit is inclined by an angle of 61° to the line of sight from the Earth. The two stars have an angular separation of about 0.44 arcseconds, making them a challenge to resolve with a telescope. The larger member of the pair is a giant star with 1.75 times the mass[2] and 24 times the luminosity of the Sun,[6] while the secondary component is a subgiant star that has 1.47 times the Sun's mass[2] and around 8 times the Sun's luminosity.[7] The system is around 1.8 billion years old.[2]

See also

References

Template:Reflist

External links

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Template:Stars of Delphinus

Template:Authority control

  1. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named aaa474_2_653
  2. ↑ a b c d e f g h i j Cite error: Invalid <ref> tag; no text was provided for refs named aj138_5_1354
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aaa341_121
  4. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aj81_245
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named ncsbo
  6. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named aaa409_251
  7. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named kaler
  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named sb0
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named wds
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named bsc1
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ a b Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ Script error: No such module "citation/CS1".
  16. ↑ Script error: No such module "citation/CS1".
  17. ↑ Script error: No such module "citation/CS1".
  18. ↑ 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.
  19. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named burnham1978
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