Melotte 20
(Collinder 39; Alpha Persei; OCSN 218)
Summary
Melotte 20 is a very rich, very dense object of very high C3 quality. It is located at a very close distance from the Sun, near the mid-plane. It is very well-studied in the literature.
Positions
| Reference | RA | DEC | Plx | pmRA | pmDE | Rv |
|---|---|---|---|---|---|---|
| Dambis (1999) | 51.079 | 49.862 | – | – | – | – |
| Dias et al. (2002) | 51.079 | 49.862 | – | 22.41 | -25.87 | -1.39 |
| Chen et al. (2003) | 50.488 | 48.622 | – | – | – | – |
| Piskunov et al. (2007) | 51.483 | 49.123 | – | – | – | – |
| Piskunov et al. (2008) | 51.483 | 49.123 | – | – | – | – |
| Kharchenko et al. (2012) | 51.675 | 48.8 | – | 21.49 | -26.11 | – |
| Loktin & Popova (2017) | 50.145 | 48.167 | – | 22.261 | -25.998 | -1.4 |
| Cantat-Gaudin et al. (2018) | 51.617 | 48.975 | 5.668 | 22.864 | -25.378 | – |
| Soubiran et al. (2018) | 51.617 | 48.975 | – | – | – | -0.1 |
| Bossini et al. (2019) | 51.617 | 48.975 | – | – | – | – |
| Donor et al. (2020) | 51.675 | 48.8 | – | 23.34 | -25.8 | 1.0 |
| Cantat-Gaudin et al. (2020) | 51.617 | 48.975 | 5.668 | 22.864 | -25.378 | – |
| Dias et al. (2021) | 51.51 | 48.933 | 5.695 | 22.845 | -25.403 | -0.517 |
| Rain et al. (2021) | 51.617 | 48.975 | 5.668 | 22.864 | -25.378 | – |
| Jaehnig et al. (2021) | 51.594 | 48.981 | 5.736 | 22.921 | -25.451 | – |
| Tarricq et al. (2022) | 51.772 | 49.05 | 5.77 | 23.017 | -25.434 | – |
| He et al. (2022) | 51.626 | 48.932 | 5.746 | 22.97 | -25.431 | – |
| Qin et al. (2023) | 51.47 | 48.92 | 5.78 | 22.89 | -25.55 | -1.35 |
| Hunt & Reffert (2023) | 51.332 | 49.119 | 5.741 | 22.918 | -25.463 | -0.869 |
| Cavallo et al. (2024) | 51.609 | 48.912 | 5.747 | – | – | – |
| Hunt & Reffert (2024) | 51.332 | 49.119 | 5.741 | 22.918 | -25.463 | -0.869 |
| Alfonso et al. (2024) | 51.762 | 48.904 | 5.702 | 22.839 | -25.462 | – |
| Almeida et al. (2025) | 51.51 | 48.933 | – | – | – | – |
| UCC | 51.633 | 48.965 | 5.74 | 22.911 | -25.434 | -1.009 |
Estimated members
Explore data in Colab
Fundamental parameters
| Reference | Values |
|---|---|
| Dambis (1999) | E_B-V_=0.099, DM0=5.94, log_age_=7.4 |
| Dias et al. (2002) | E(B-V)=0.09, Dist=185.0, Age=7.854, [Fe/H]=0.04 |
| Chen et al. (2003) | E(B-V)=0.09, HDis=185, Age=0.07, [Fe/H]_1=-0.05 |
| Piskunov et al. (2007) | E(B-V)=0.09, Dist=190, logt=7.55, logM=4.075 |
| Piskunov et al. (2008) | E(B-V)=0.09, Dist=190, logt=7.55, logM=4.186, logMA=3.863 |
| Kharchenko et al. (2012) | e_bv=0.09, distance=175, log_age=7.7 |
| Loktin & Popova (2017) | E(B-V)=0.09, Dist=184, logt=7.854 |
| Cantat-Gaudin et al. (2018) | dmode=175.5 |
| Soubiran et al. (2018) | dmode=175.5 |
| Bossini et al. (2019) | AV=0.055, Dist=5.824, logA=7.938, Fe/H=0.14 |
| Donor et al. (2020) | Fe/H=0.01 |
| Cantat-Gaudin et al. (2020) | AVNN=0.3, DistPc=171.0, AgeNN=7.71 |
| Dias et al. (2021) | Av=0.324, Dist=177, logage=7.921, [Fe/H]=0.158 |
| Rain et al. (2021) | E(B-V)=0.09, Dist=175.5, log(Age)=7.85, NBSS=0 |
| Jaehnig et al. (2021) | dmode=0.175 |
| Tarricq et al. (2022) | Dist=171, logAgeNN=7.71 |
| He et al. (2022) | A0=0.55, logAge=7.8 |
| Qin et al. (2023) | E(B-V)=0.09, m-M=6.39, logt=7.8 |
| Hunt & Reffert (2023) | AV50=0.242, diffAV50=0.61, MOD50=6.185, logAge50=7.745 |
| Cavallo et al. (2024) | AV50=0.74, dMod50=6.19, logAge50=7.62, [Fe/H]50=0.12 |
| Hunt & Reffert (2024) | MassJ=391.620, MassTot=502.798 |
| Alfonso et al. (2024) | AV=0.29558, MOD=6.17204, logAge=7.81183, Z=0.15657 |
| Almeida et al. (2025) | AV=0.324, Dist=177, logAge=7.921, MassRk=536.0 |
Search coordinates in Bayestar19