Psi-1 Aquarii

From Wikipedia, the free encyclopedia

For other stars named Psi Aqr, see Psi Aquarii
91 Aquarii
Observation data
Epoch J2000.0
Constellation
(pronunciation)		 Aquarius
Right ascension 23h 15m 53.5s
Declination −9° 05′ 16″
Apparent magnitude (V) +4.24
Characteristics
Spectral type K0III
U-B color index 0.99
B-V color index 1.11
Variable type none
Astrometry
Radial velocity (Rv) -26.4 km/s
Proper motion (μ) RA: 368.56 mas/yr
Dec.: -17.02 mas/yr
Parallax (π) 21.97 ± 0.89 mas
Distance 148 ly (46 pc)
Absolute magnitude (MV) 0.95
Details
Mass 2.5 M☉
Radius 8.55 R☉
Luminosity 33 L☉
Temperature 5250 K
Metallicity ?
Rotation ?
Age ? years
Visual binary orbit
Companion ψ1 Aqr B
Semimajor axis (a) 49.6"
Inclination (i) 312°
Visual binary orbit
Companion ψ1 Aqr C
Semimajor axis (a) 0.2"
Inclination (i) 101°
Visual binary orbit
Companion ψ1 Aqr D
Semimajor axis (a) 80.4"
Inclination (i) 274°
Visual binary orbit
Companion ψ1 Aqr E
Semimajor axis (a) 19.7"
Inclination (i) 341°
Visual binary orbit
Companion ψ1 Aqr F
Semimajor axis (a) ?"
Inclination (i) ?°
Other designations
91 Aquarii, Gl 893.2, HR 8841, HD 219449, BD-09°6156, FK5 1608, HIP 114855, SAO 146598, GC 32374, ADS 16633, CCDM 23159-0905.
Database references
SIMBAD data

91 Aquarii, also known as Psi1 Aquarii (ψ1 Aqr / ψ1 Aquarii), is a multiple star system approximately 148 light-years away in the constellation of Aquarius. The system comprises five stars, with the primary star being an orange giant star. As of 2003, an extrasolar planet is known to orbit the primary star.

Contents

[edit] Star system

The primary star (91 Aquarii A) is an orange giant star with an apparent magnitude of +4.24. At a separation of 49.6 arcseconds from the primary is a binary companion composed of two 10th magnitude stars (91 Aquarii B and C). They are 0.3 arcseconds from each other. The system has two other components, the 13th magnitude (91 Aquarii D) 80.4 arcseconds from the primary and the 14th magnitude (91 Aquarii E) 19.7 arcseconds from B.

[edit] Planetary system

In 2003, the discovery of an extrasolar planet orbiting a giant star was announced.

The Psi-1 Aquarii system
Planet
(in order from star)		 Mass
(MJ)		 Orbital period
(days)		 Semimajor axis
(AU)		 Eccentricity
b >2.9 182 0.3 0

[edit] See also

[edit] External links

Sun  This giant star-related article is a stub. You can help Wikipedia by expanding it.
Sun  This binary or multiple star system-related article is a stub. You can help Wikipedia by expanding it.
Exoplanet icon  This extrasolar planet related article is a stub. You can help Wikipedia by expanding it.