 VLT/SPHERE image of the circumstellar disk and protoplanet candidate b around HD 169142. Credit: ESO VLT/SPHERE - Monash University - Iain Hammond et al., adapted and mixed by Meli_thev | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 24m 29.7800s[1] |
| Declination | −29° 46′ 49.3286″[1] |
| Apparent magnitude (V) | 8.16 |
| Characteristics | |
| Evolutionary stage | Herbig Ae/Be star |
| Spectral type | A9III/IVe[2] |
| Astrometry | |
| Radial velocity (Rv) | −3±2[3] km/s |
| Proper motion (μ) | RA: −2.335[4] mas/yr Dec.: −37.879[4] mas/yr |
| Parallax (π) | 8.7053 ± 0.0268 mas[4] |
| Distance | 375 ± 1 ly (114.9 ± 0.4 pc) |
| Details[2] | |
| Mass | 1.65 M☉ |
| Radius | 1.6 R☉ |
| Luminosity | 8.6 L☉ |
| Surface gravity (log g) | 4.05±0.05 cgs |
| Temperature | 7650±150 K |
| Metallicity [Fe/H] | −0.375±0.125 dex |
| Rotational velocity (v sin i) | 55±5 km/s |
| Age | 7.5±4.5 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 169142 is a single Herbig Ae/Be star. Its surface temperature is 7650±150 K. HD 169142 is depleted of heavy elements compared to the Sun, with a metallicity Fe/H index of −0.375±0.125, but is much younger at an age of 7.5±4.5 million years.[2] The star is rotating slowly and has relatively low stellar activity for a Herbig Ae/Be star.[3]
- ^ a b c "CD-29 9873". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-03-22.
- ^ a b c Quanz, Sascha P.; Avenhaus, Henning; Buenzli, Esther; Garufi, Antonio; Schmid, Hans Martin; Wolf, Sebastian (2013), "Gaps in the Hd 169142 Protoplanetary Disk Revealed by Polarimetric Imaging: Signs of Ongoing Planet Formation?", The Astrophysical Journal, 766 (1): L2, arXiv:1302.3029, Bibcode:2013ApJ...766L...2Q, doi:10.1088/2041-8205/766/1/L2, S2CID 118643209
- ^ a b High-resolution spectroscopy of Vega-like stars — II. Age indicators, activity and circumstellar gas
- ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.