Theta2 Microscopii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Microscopium |
| Right ascension | 21h 24m 24.81796s |
| Declination | −41° 00′ 24.1033″ |
| Apparent magnitude (V) | 5.76 |
| Characteristics | |
| Spectral type | A0IIIpSi |
| U−B color index | -0.21 |
| B−V color index | -0.04 |
| Astrometry | |
| Radial velocity (Rv) | +8.00 km/s |
| Proper motion (μ) | RA: +24.64 mas/yr Dec.: −0.25 mas/yr |
| Parallax (π) | 8.35±0.70 mas |
| Distance | 390 ± 30 ly (120 ± 10 pc) |
| Absolute magnitude (MV) | 0.39 |
| Orbit | |
| Period (P) | 464.66 yr |
| Semi-major axis (a) | 0.836″ |
| Eccentricity (e) | 0.210 |
| Inclination (i) | 111.8° |
| Details | |
| Luminosity | 78.22 L☉ |
| Temperature | 10,378 K |
| Other designations | |
| CD−41 14503, CCDM J21245-4100AB, GC 29950, HIP 105696, HR 8180, HD 203585, SAO 230667, WDS J21244-4100AB | |
| Database references | |
| SIMBAD | data |
Theta2 Microscopii (θ2 Mic) is a class A0III (white giant) star in the constellation Microscopium. Its apparent magnitude is 5.76 and it is approximately 390 light years away based on parallax. It is an Ap star, a chemically peculiar star with unusually strong metallic spectral lines.
The main star is known to be a binary, with two components A (6.24 mag) and B (6.88 mag) orbiting with a semimajor axis of 0.836" and eccentricity 0.201, with a period 464.66 years. A more distant companion, C, has a separation around 78.4" and magnitude 10.3.