Rho Aquilae

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Template:Short description

ρ Aquilae
File:Delphinus - Rho Aquilae.jpg
Location of Rho Aquilae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Delphinus
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.94[2]
Characteristics
Spectral type A2 V[3]
U−B Template:Engvar +0.01[4]
B−V Template:Engvar +0.09[4]
Astrometry
Radial velocity (Rv)−23.0[2] km/s
Proper motion (μ) RA: +55.03[1] mas/yr
Dec.: +58.14[1] mas/yr
Parallax (π)21.75±0.26 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+1.63[5]
Details
MassScript error: No such module "val".[6] Template:Solar mass
Radius1.95[7] Template:Solar radius
Luminosity22[6] Template:Solar luminosity
Surface gravity (log g)4.2[7] cgs
TemperatureScript error: No such module "val".[6] K
Metallicity [Fe/H]−0.21[8] dex
Rotational velocity (v sin i)180[9] km/s
AgeScript error: No such module "val".[6] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10]
Database references
SIMBADdata

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Rho Aquilae, ρ Aquilae, is the Bayer designation for a star in the northern constellation of Delphinus. It has an apparent visual magnitude of 4.94[2] and is bright enough to be seen with the naked eye in good conditions.

Distance, proper motion and constellation

The annual parallax shift is 21.75 milliarcseconds,[1] which corresponds to a distance of the star of around Script error: No such module "convert". from Earth. Relatively high proper motion resulted in the star crossing the border from Aquila into Delphinus in 1992.[11][12] Rho Aquilae is therefore a rare occurrence of a mismatch between current constellation and Bayer designation constellation. The star is in the low-northern constellation of Delphinus therefore at least seasonally visible to all but the high southern latitudes.

Chinese constellations and components

This star has the traditional name Tso Ke, from the Cantonese 左旗 jo keih meaning "the left flag". In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang". in Mandarin), within the Ox, refers to an asterism consisting of this star, α, β, γ, δ, ζ, 11, 13, and 14 Sagittae stars of Sagitta to the west.[13] Consequently, ρ Aquilae itself is known as Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[14]

Physical characteristics

Rho Aquilae is an A-type main sequence star with a stellar classification of A2 V.[3] This star is about 400 million years old and it displays an excess emission of infrared radiation that may be explained by a circumstellar disk of dust.[15][16]

References

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  1. ↑ a b c d e f Script error: No such module "citation/CS1".
  2. ↑ a b c Script error: No such module "citation/CS1".
  3. ↑ a b Script error: No such module "citation/CS1".
  4. ↑ a b Script error: No such module "citation/CS1".
  5. ↑ Script error: No such module "citation/CS1".
  6. ↑ a b c d Script error: No such module "citation/CS1".
  7. ↑ a b Script error: No such module "citation/CS1".
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ Script error: No such module "citation/CS1".
  10. ↑ Template:Cite simbad
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ 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.
  14. ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 3 日 Template:Webarchive
  15. ↑ Script error: No such module "citation/CS1".
  16. ↑ Script error: No such module "citation/CS1".

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External links

Template:Stars of Delphinus

Template:Authority control

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