Pi1 Ursae Minoris

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Template:Short description

Template:Other stars by Bayer designation

π1 Ursae Minoris
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Ursa Minor
π1 UMi A
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +6.58[2]
π1 UMi B
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +7.31[2]
Characteristics
π1 UMi A
Spectral type G1.5 V(n)[3]
U−B Template:Engvar +0.13[2]
B−V Template:Engvar +0.67[2]
π1 UMi B
Spectral type G9 V[4]
U−B Template:Engvar +0.37[2]
B−V Template:Engvar +0.79[2]
Astrometry
π1 UMi A
Radial velocity (Rv)Template:Val[5] km/s
Proper motion (μ) RA: −225.109[6] mas/yr
Dec.: +107.575[6] mas/yr
Parallax (π)45.8577±0.0328 mas[6]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)Template:Val[7]
π1 UMi B
Radial velocity (Rv)Template:Val[5] km/s
Proper motion (μ) RA: −217.817[8] mas/yr
Dec.: +105.947[8] mas/yr
Parallax (π)45.8038±0.0352 mas[8]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Details
π1 UMi A
Mass1.02[9] Template:Solar mass
Radius0.98[6] Template:Solar radius
Luminosity0.929[6] Template:Solar luminosity
Surface gravity (log g)4.40[10] cgs
Temperature5,771[10] K
Metallicity [Fe/H]−0.22[11] dex
AgeTemplate:Val[12] Gyr
π1 UMi B
Mass0.92[9] Template:Solar mass
Radius0.84[8] Template:Solar radius
Luminosity0.520[8] Template:Solar luminosity
Surface gravity (log g)4.50[10] cgs
Temperature5,408[10] K
Metallicity [Fe/H]−0.18[11] dex
Other designations
Template:Odlist[13]
π1 UMi A: Template:Odlist
π1 UMi B: Template:Odlist
Database references
SIMBADπ1 UMi AB
π1 UMi A
π1 UMi B

Script error: No such module "Check for unknown parameters".

Pi1 Ursae Minoris[14] is a common proper motion binary star[15] system in the northern circumpolar constellation of Ursa Minor. The pair have apparent visual magnitudes of +6.58 and +7.31, with a combined magnitude of 6.1.[2] They are located about 71 light years from the Sun. The two have an angular separation of 31.4 arc seconds,[15] which corresponds to a physical separation of about 680 AU,[16] and orbit each other with a period of about 13,100 years.[9]

Both stars are solar analogs and have been listed as possible members of the Hercules-Lyra association, one of the nearest moving groups to the Sun,[16] although this is now considered unlikely.[17] The primary, π1 Ursae Minoris A, has a mass 2% higher than the sun, an almost identical effective temperature at Template:Val, a radius 98% of the sun's, and a bolometric luminosity 93% of the sun's. The secondary, π1 Ursae Minoris B, has a mass 92% of the sun's, a slightly lower temperature of Template:Val, a radius 84% of the sun's, and a luminosity slightly over half of the sun.

References

Template:Reflist

External links

Template:Stars of Ursa Minor

  1. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named vanLeeuwen2007
  2. ↑ a b c d e f g Cite error: Invalid <ref> tag; no text was provided for refs named Johnson1953
  3. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Gray2006
  4. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Abt1981
  5. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named deBruijne2012
  6. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named dr2a
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa563_A52
  8. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named dr2b
  9. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Tokovinin2014
  10. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Mishenina2013
  11. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Casagrande2011
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Pace2013
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Kepple1998
  15. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Lepine2007
  16. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Eisenbeiss2013
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named MG
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