Pi3 Orionis

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π3 Orionis
Template:Location mark
Location of π3 Orionis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Orion
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 3.16[2]
Characteristics
Spectral type F6 V[2]
U−B Template:Engvar +0.00[2]
B−V Template:Engvar +0.46[2]
Variable type Suspected[3]
Astrometry
Radial velocity (Rv)24.1[4] km/s
Proper motion (μ) RA: 464.06[1] mas/yr
Dec.: 11.21[1] mas/yr
Parallax (π)123.94±0.17 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)3.65[5]
Details[6]
MassTemplate:Val Template:Solar mass
RadiusTemplate:Val Template:Solar radius
LuminosityTemplate:Val Template:Solar luminosity
Surface gravity (log g)Template:Val cgs
TemperatureTemplate:Val K
Metallicity [Fe/H]Template:Val dex
Rotational velocity (v sin i)17[7] km/s
Age1.04[8] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Tabit, π3 Ori, 1 Ori, BD+06°762, FK5 1134, GCTP 1077.00, Gliese 178, HD 30652, HIP 22449, HR 1543, LTT 11517, SAO 112106[9]
Database references
SIMBADdata

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Pi3 Orionis (π3 Orionis, abbreviated Pi3 Ori, π3 Ori), also named Tabit Template:IPAc-en,[10][11] is a star in the equatorial constellation of Orion. At an apparent visual magnitude of 3.16,[2] it is readily visible to the naked eye and is the brightest star in the lion's hide (or shield) that Orion is holding. As measured using the parallax technique, it is Template:Convert distant from the Sun.[1]

Nomenclature

π3 Orionis (Latinised to Pi3 Orionis) is the system's Bayer designation.

It bore the traditional name of 'Tabit', from the Arabic الثابت al-thābit 'the endurer (the fixed/constant one)'.[12] In 2016, the IAU organized a Working Group on Star Names (WGSN)[13] to catalog and standardize proper names for stars. The WGSN approved the name Tabit for this star on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.[11]

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Banner of Three Stars, refers to an asterism consisting of π3 Orionis, ο1 Orionis, ο2 Orionis, 6 Orionis, π1 Orionis, π2 Orionis, π4 Orionis, π5 Orionis and π6 Orionis.[14] Consequently, the Chinese name for Pi3 Orionis itself is Script error: No such module "Lang". (Script error: No such module "Lang".), "the Sixth Star of Banner of Three Stars".[15]

According to Richard Hinckley Allen: Star Names – Their Lore and Meaning, this star, together with ο1 Orionis, ο2 Orionis, π1 Orionis, π2 Orionis, π4 Orionis, π5 Orionis, π6 Orionis and 6 Orionis (are all of the 4th to the 5th magnitudes and in a vertical line), indicate the lion's skinwere but Al Tizini said that they were the Persians' Al Tāj, "the Crown", or "Tiara", of their kings; and the Arabians' Al Kumm, "the Sleeve", of the garment in which they dressed the Giant, the skin being omitted. Ulugh Beg called them Al Dhawāib, "Anything Pendent"; and the Borgian globe had the same, perhaps originated it. Al Sufi's title was Manica, a Latin term for a protecting Gauntlet; and Grotius gave a lengthy dissertation on the Mantile, which some anonymous person applied to them, figured as a cloth thrown over the Giant's arm.[16]

Properties

Pi3 Orionis is most likely single; a nearby star is probably an optical companion.[17]

It is a main-sequence star of spectral type F6 V. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.[18] Compared to the Sun, it has about 129% of the mass, 132% of the radius, and nearly 3 times the luminosity. This energy is being radiated from the star's outer atmosphere at an effective temperature of Template:Val,[6] giving it the yellow-white glow of an F-type star.

Although a periodicity of 73.26 days has been observed in the star's radial velocity, it seems likely to be bound more to stellar activity than to a planetary object in close orbit. No substellar companion has been detected so far around Tabit and the McDonald Observatory team has set limits to the presence of one or more planets[19] with masses between 0.84 and 46.7 Jupiter masses and average separations spanning between 0.05 and 5.2 astronomical units. Thus, so far it appears that planets could easily orbit in the habitable zone without any complications caused by a gravitationally perturbing body.

See also

References

Template:Reflist

External links

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Template:Stars of Orion

  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 Cite error: Invalid <ref> tag; no text was provided for refs named yerkes53
  3. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named csvs
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  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaass501_3_941
  6. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named soubiran
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  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named luck
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Rumrill
  11. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named IAU-LSN
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named moore2011
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named WGSN
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named vFVHT
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named IwFTF
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named nLDhc
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named mnras389_2_869
  18. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named baas25_1319
  19. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named apj132_1_177
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