Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Microscopium |
Right ascension | 20h 48m 29.14779s[1] |
Declination | −43° 59′ 18.6369″[1] |
Apparent magnitude (V) | 5.11[2] |
Characteristics | |
Spectral type | F2V[3] |
U−B color index | +0.04[4] |
B−V color index | +0.35[5] |
Astrometry | |
Radial velocity (Rv) | −14.35±0.69 km/s |
Proper motion (μ) | RA: +178.881[1] mas/yr Dec.: −112.407[1] mas/yr |
Parallax (π) | 26.9052 ± 0.1782 mas[1] |
Distance | 121.2 ± 0.8 ly (37.2 ± 0.2 pc) |
Absolute magnitude (MV) | 2.05[2] |
Details | |
Mass | 1.42[6] M☉ |
Radius | 2.4[7] R☉ |
Luminosity | 12.65[2] L☉ |
Surface gravity (log g) | 3.90±0.14[6] cgs |
Temperature | 6,997±238[6] K |
Metallicity [Fe/H] | −0.03[2] dex |
Rotational velocity (v sin i) | 115[8] km/s |
Age | 1.094[6] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
ι Microscopii, Latinized as Iota Microscopii, is a suspected astrometric binary[10] star system in the southern constellation of Microscopium, near the southern constellation border with Indus. It is visible to the naked eye as a dim, yellow-white hued point of light with an apparent visual magnitude of 5.11.[2] This object is 121 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −14 km/s.[1]
The visible component is an ordinary F-type main-sequence star with a stellar classification of F2V,[3] which indicates it is generating energy through core hydrogen fusion. It is around a billion years old with 1.4 times the mass of the Sun[6] and 2.4[7] times the Sun's radius. The star is radiating 13[2] times the luminosity of the Sun from its photosphere at an effective temperature of 6,997 K.[6] It has a high rate of spin with a projected rotational velocity of 115 km/s, which is giving the star an equatorial bulge that is 6% larger than the polar radius.[8]
Iota Microscopii has one visual companion, first observed in 1932, with a separation of 4.3" and a visual magnitude of 15.5.[11]
Eggleton2008
was invoked but never defined (see the help page).