Pi1 Ursae Majoris: Difference between revisions

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{{short description|Star in the constellation Ursa Major}}
{{short description|Star in the constellation Ursa Major}}
{{For|other stars with this name|Pi Ursae Majoris|Muscida}}
{{For|other stars with this name|Pi Ursae Majoris}}
{{DISPLAYTITLE:Pi<sup>1</sup> Ursae Majoris}}
{{DISPLAYTITLE:Pi<sup>1</sup> Ursae Majoris}}
{{Starbox begin
{{Starbox begin
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}}
}}
{{Starbox catalog
{{Starbox catalog
| names=π¹&nbsp;Ursae Majoris, π¹&nbsp;UMa, Pi<sup>1</sup>&nbsp;UMa, 3&nbsp;Ursae Majoris, [[Star catalogue#BD/CD/CPD|BD]]+65°643, [[Boss General Catalogue|GC]]&nbsp;11817, [[Henry Draper catalogue|HD]] 72905, [[Hipparcos catalogue|HIP]] 42438, [[Bright Star Catalogue|HR]]&nbsp;3391, [[PPM Star Catalogue|PPM]]&nbsp;16705, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;14609
| names={{odlist | B=π¹ UMa | F=3 UMa | BD=+65 643 | GC=11817 | GJ=311 | HD=72905 | HIP=42438 | HR=3391 | PPM=16705 | SAO=14609}}<ref name=SIMBAD/>
}}
}}
{{Starbox reference
{{Starbox reference
|Simbad=pi1+UMa
|Simbad=pi1+UMa
}}
}}
{{Starbox end}}
{{Starbox end}}
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==References==
==References==
{{reflist|35em|refs=
{{reflist|35em|refs=
<ref name=SIMBAD>{{cite simbad |title=* pi.01 UMa}}</ref>


<ref name=Holmberg2009>{{citation
<ref name=Holmberg2009>{{citation
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[[Category:Hipparcos objects|042438]]
[[Category:Hipparcos objects|042438]]
[[Category:Bright Star Catalogue objects|3391]]
[[Category:Bright Star Catalogue objects|3391]]
[[Category:Durchmusterung objects]]
[[Category:Durchmusterung objects|BD+65 0643]]
[[Category:Ursa Major moving group]]
[[Category:Ursa Major moving group]]
[[Category:Gliese and GJ objects|0311]]

Latest revision as of 19:08, 21 June 2025

Template:Short description Script error: No such module "For".

Pi1 Ursae Majoris
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Location of π¹ Ursae Majoris (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 5.63
Characteristics
Spectral type G1.5Vb[2]
U−B Template:Engvar +0.07[3]
B−V Template:Engvar +0.62[3]
Variable type BY Draconis
Astrometry
Radial velocity (Rv)–13.88 ± 0.47[4] km/s
Proper motion (μ) RA: -27.44 ± 0.31[1] mas/yr
Dec.: +88.13 ± 0.26[1] mas/yr
Parallax (π)69.66±0.37 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)4.86[5]
Details
Mass0.90[6] Template:Solar mass
Luminosity0.97[7] Template:Solar luminosity
Surface gravity (log g)4.48[8] cgs
Temperature5,884 ± 6.8[9] K
Metallicity [Fe/H]–0.04[8] dex
Rotation5 days[10]
Rotational velocity (v sin i)14.27[4] km/s
Age200[11] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[12]
Database references
SIMBADdata

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File:Pi1UMaLightCurve.png
A light curve for pi1 Ursae Majoris, plotted from TESS data.[13] The main plot shows the variation over several weeks, and the inset plot shows the same data folded, assuming a 4.9 day period,[14] and averaged into 250 phase bins.

Pi1 Ursae Majoris (Pi1 UMa, π¹ Ursae Majoris, π¹ UMa) is a yellow G-type main sequence dwarf with a mean apparent magnitude of +5.63. It is approximately 46.8 light years from Earth,[1] and is a relatively young star with an age of about 200 million years.[11] It is classified as a BY Draconis type variable star and its brightness varies by 0.08 magnitudes. In 1986, it became the first solar-type star to have the emission from an X-ray flare observed.[15] Based upon its space velocity components, this star is a member of the Ursa Major moving group of stars that share a common motion through space.[7][10]

An excess of infrared radiation has been detected from this system, which suggests the presence of a debris disk. The best fit to the data indicates that there is a ring of fine debris out to a radius of about 0.4 AU, consisting of 0.25 μm grains of amorphous silicates or crystalline forsterite. There may also be a wider ring of larger (10 μm) grains out to a distance of 16 AU.[16]

Naming and etymology

With π2, σ1, σ2, ρ, A and d, it composed the Arabic asterism Al Ṭhibā᾽, the Gazelle.[17] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Ṭhibā were the title for seven stars : A as Althiba I, this star (π1) as Althiba II, π2 as Althiba III, ρ as Althiba IV, σ1 as Althiba V, σ2 as Althiba VI, and d as Althiba VII.[18]

References

Template:Reflist

External links

Template:Stars of Ursa Major

  1. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named assl350
  2. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named mnras328_1_45
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named clpl4
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aj133_6_2524
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Holmberg2009
  6. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named apjss192_1_2
  7. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aj120_2_1006
  8. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named mnras374_2_664
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa411_3_559
  10. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aaa521_A12
  11. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named apj687_2_1264
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named MAST
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Kochukhov
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa157_2_217
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named apj639_2_1166
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named allen1899
  18. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named rhoads1971
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