HD 100546
HD 100546, also known as KR Muscae, is a pre-main sequence star of spectral type B8 to A0 located 353 light-years (108 parsecs) from Earth in the southern constellation of Musca. The star is surrounded by a circumstellar disk from a distance of 0.2 to 4 AU, and again from 13 AU out to a few hundred AU, with evidence for a protoplanet forming at a distance of around 47 AU.
This image from the NASA/ESA Hubble Space Telescope shows a visible light view of the outer dust around the young star HD 100546, with the newly discovered protoplanet positioned and marked by an orange spot. Artifacts from the brilliant central star dominate the inner part of this picture, which has been digitally subtracted. Black blobs are also artifacts. | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Musca |
| Right ascension | 11h 33m 25.441s |
| Declination | −70° 11′ 41.24″ |
| Apparent magnitude (V) | 6.68 – 6.87 |
| Characteristics | |
| Evolutionary stage | Herbig Ae/Be star |
| Spectral type | kB8 – A0Vae |
| Apparent magnitude (B) | 6.71±0.01 |
| Apparent magnitude (V) | 6.30 |
| Apparent magnitude (G) | 6.686±0.003 |
| Apparent magnitude (I) | 6.64±0.05 |
| Apparent magnitude (J) | 6.425±0.020 |
| Apparent magnitude (H) | 5.96±0.03 |
| Apparent magnitude (K) | 5.418±0.023 |
| Astrometry | |
| Radial velocity (Rv) | 9.10±1.2 km/s |
| Proper motion (μ) | RA: −38.730(46) mas/yr Dec.: −0.097(39) mas/yr |
| Parallax (π) | 9.2494 ± 0.0375 mas |
| Distance | 353 ± 1 ly (108.1 ± 0.4 pc) |
| Details | |
| Mass | 2.18+0.02 −0.17 M☉ |
| Radius | 1.5±0.1 R☉ |
| Luminosity | 19.5+7.42 −5.37 L☉ |
| Surface gravity (log g) | –4.0 cgs |
| Temperature | 9,800 K |
| Metallicity [Fe/H] | –1.0 – –1.4±0.2 dex |
| Age | 4.8+2.0 −1.1 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Estimated to be less than 10 million years old, it belongs to Herbig Ae/Be stars, and also the nearest example to the Solar System.
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