Pi Andromedae

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Template:Short description

Pi Andromedae
Template:Location mark
Location of π Andromedae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.36[2] (4.9/5.3)[3]
Characteristics
Spectral type B5 V[4] (B5 V + B5 V[3])
U−B Template:Engvar –0.55[2]
B−V Template:Engvar –0.16[2]
Astrometry
Radial velocity (Rv)+8.7[5] km/s
Proper motion (μ) RA: Template:Val mas/yr[1]
Dec.: Template:Val mas/yr[1]
Parallax (π)5.6563±0.1474 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Orbit[6]
Period (P)Template:Val
Semi-major axis (a)Template:Val
Eccentricity (e)0.542±0.006
Inclination (i)103.0±0.2°
Longitude of the node (Ω)94.7±0.2°
Periastron epoch (T)7717.7±0.4
Argument of periastron (ω)
(secondary)		170.7±0.7°
Semi-amplitude (K1)
(primary)		47.50±0.53 km/s
Semi-amplitude (K2)
(secondary)		117.4±2.8 km/s
Details[7]
A
Mass5.8[6] Template:Solar mass
Radius4.7 Template:Solar radius
Luminosity1,000 Template:Solar luminosity
Surface gravity (log g)4.10[4] cgs
Temperature15,000 K
Metallicity [Fe/H]–0.20[4] dex
Rotational velocity (v sin i)25[8] km/s
Age80 Myr
B
Mass4.8[6] Template:Solar mass
Radius4.7 Template:Solar radius
Luminosity1,000 Template:Solar luminosity
Temperature15,000 K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist
Database references
SIMBADdata

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Pi Andromedae is a binary star[3] system in the northern constellation of Andromeda. Its Bayer designation is latinized from π Andromedae, and abbreviated Pi And or π And, respectively. With an apparent visual magnitude of 4.4,[2] it is visible to the naked eye. Based on parallax measurements, it is located at a distance of approximately Template:Convert from Earth.[1]

File:Pi Andromedae.jpg
π Andromedae in optical light

The pair is classified as a blue-white B-type main sequence dwarf, with an apparent magnitude of +4.34. It is a spectroscopic binary with an orbital period of 143.5 days and an eccentricity of 0.54.[6]

The spectroscopic binary forms a triple system with BD+32 102, a magnitude 8.6 star located 35.9 arcseconds away.[3] At 55 arcseconds separation is an 11th magnitude companion that is just located on the same line of sight, but at a very different distance from us.

Naming

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Legs (asterism), refers to an asterism consisting of π Andromedae, η Andromedae, 65 Piscium, ζ Andromedae, ε Andromedae, δ Andromedae, ν Andromedae, μ Andromedae, β Andromedae, σ Piscium, τ Piscium, 91 Piscium, υ Piscium, φ Piscium, χ Piscium and ψ¹ Piscium. Consequently, the Chinese name for π Andromedae itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[9]

References

Template:Reflist

External links

Template:Stars of Andromeda

  1. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named Gaia EDR3
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named clpl4_99
  3. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named mnras389_2_869
  4. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named mnras374_2_664
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named gcrv
  6. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Hummel_et_al_1995
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named apj573_1_359
  9. ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日 Template:Webarchive
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