AP Columbae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Columba |
| Right ascension | 06h 04m 52.14866s |
| Declination | −34° 33′ 35.7744″ |
| Apparent magnitude (V) | 12.96±0.01 |
| Characteristics | |
| Spectral type | M5 |
| V−R color index | 1.47±0.03 |
| R−I color index | 1.89±0.03 |
| Variable type | Flare star |
| Astrometry | |
| Radial velocity (Rv) | 23.91±0.49 km/s |
| Proper motion (μ) | RA: +25.787 mas/yr Dec.: +343.018 mas/yr |
| Parallax (π) | 115.3982±0.0298 mas |
| Distance | 28.264 ± 0.007 ly (8.666 ± 0.002 pc) |
| Absolute magnitude (MV) | 13.34 |
| Details | |
| Mass | 0.265±0.008 M☉ |
| Radius | 0.291±0.009 R☉ |
| Luminosity (visual, LV) | 0.00641±0.00019 L☉ |
| Habitable zone inner limit | 0.083 AU |
| Habitable zone outer limit | 0.165 AU |
| Temperature | 3,077±102 K |
| Rotation | 11±1 km/s |
| Age | 12–50 Myr |
| Other designations | |
| 2MASS J06045215-3433360, GSC 07079-01500, LTT 2449, L 523-55 | |
| Database references | |
| SIMBAD | data |
AP Columbae is a pre-main-sequence star in the constellation of Columba. It is a small red dwarf with about one-quarter of the radius and mass of the Sun, but less than 1% of its luminosity. This star is located at around 28 ly (8.7 pc) from Earth based on measurements by the Gaia spacecraft, It is closest young star to the Earth, estimated to be 12 and 50 million years old. The Solar System for comparison is 4.5 billion years old.