91 Aquarii

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91 Aquarii
Template:Location mark
Location of ψ1 Aquarii (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Aquarius
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +4.248[2]
Characteristics
Spectral type K1 III[3]
U−B Template:Engvar +1.035[2]
B−V Template:Engvar +1.104[2]
R−I Template:Engvar 0.56[4]
Astrometry
Radial velocity (Rv)Template:Val[1] km/s
Proper motion (μ) RA: +369.477 mas/yr[1]
Dec.: Template:Val mas/yr[1]
Parallax (π)22.0924±0.1302 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)0.919[5]
Details[6]
MassTemplate:Val[6] Template:Solar mass
Template:Val[6] Template:Solar mass
Template:Val[7] Template:Solar mass
Template:Val[8] 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)Template:Val[8] km/s
AgeTemplate:Val[8] Gyr
Template:Val[7] Gyr
Template:Val[9] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Psi1 Aquarii, ADS 16633, Gl 893.2, WDS J23159-0905
A: BD−09 6156, FK5 1608, HD 219449, HIP 114855, HR 8841, LTT 9437, SAO 146598
BC: BD−09 6155, HD 219430, LTT 9434, SAO 146596
Database references
SIMBADA
BC

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91 Aquarii is a triple star[10] system in the equatorial constellation of Aquarius. It also bears the Bayer designation Psi1 Aquarii (ψ1 Aqr, ψ1 Aquarii). It is visible to the naked eye with an apparent visual magnitude of +4.248.[2] Parallax measurements yield an estimated distance of around Template:Convert from Earth.[11] An extrasolar planet is known to orbit the main star.

Stellar system

91 Aquarii is a triple star system.[10] The primary component, 91 Aqr A, is a giant star with a stellar classification of K1 III.[3] This is an evolved star that has expanded to over 10 times the size of the Sun's size. Is mass and age are uncertain, mass estimates range from Template:Solar mass[6] to Template:Solar mass,[8] while age ranges from 1.5[8] to 9 billion years.[9] It is radiating 48 times the Sun's luminosity from its outer envelope at an effective temperature of 4,630 K.[6] This gives it the orange-hued glow of a K-type star.[12]

The primary shares a common proper motion with two others stars, 91 Aqr B and C, suggesting that they are physically connected.[13] The latter pair form a binary system located at an angular separation of 52 arcseconds from the primary.[14] They are 10th magnitude stars separated by 0.3 arcseconds from each other.

Component Apparent magnitude (V) Spectral type
A 4.22 K0 III
B 9.62 K3 V
C 10.10

Because it lies near the same line of sight, the binary star system CCDM J23159-0905DE was listed to belong to the 91 Aquarii system according to the CCDM catalogue.[15] However, it is listed as physically unconnected in the WDS catalogue[16] and the pair have a different proper motion than 91 Aquarii.[13] CCDM J23159-0905DE has two components, the 13th magnitude CCDM J23159-0905D 80.4 arcseconds from 91 Aquarii, and the 14th magnitude CCDM J23159-0905E 19.7 arcseconds from 91 Aquarii.

Planetary system

In 2003, the discovery of an extrasolar planet orbiting 91 Aquarii A was announced,[17] but its confirmation was not formally published until 2013.[7]

Template:OrbitboxPlanet begin Template:OrbitboxPlanet Template:Orbitbox end

See also

References

Template:Reflist

External links

Template:Stars of Aquarius

Template:Sky

  1. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named GaiaDR3
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named mnras172_667
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Baines2018
  4. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Viz
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Liu2007
  6. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named Soubiran2024
  7. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Mitchell2013
  8. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named Jofre2015
  9. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Gomes2021
  10. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named mnras389_2_869
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa474_2_653
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named csiro
  13. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aaa542_A92
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named msom1962
  15. ↑ Script error: No such module "citation/CS1".
  16. ↑ Script error: No such module "citation/CS1".
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Mitchell2003
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