Melotte 186
(Collinder 359; OCL 84; Bull of Poniatowski; MWSC 2773)
Summary
Melotte 186 is a moderately populated, very dense object of very high C3 quality. It is located at a close distance from the Sun, above the mid-plane. It is very well-studied in the literature.
This object shares a significant percentage of members with 2 later reported entries.
Positions
| Reference | RA | DEC | Plx | pmRA | pmDE | Rv |
|---|---|---|---|---|---|---|
| Dambis (1999) | 270.275 | 2.9 | – | – | – | – |
| Dias et al. (2002) | 270.275 | 2.9 | – | 0.47 | -9.1 | -5.37 |
| Piskunov et al. (2007) | 270.161 | 2.926 | – | – | – | – |
| Piskunov et al. (2008) | 270.161 | 2.926 | – | – | – | – |
| Kharchenko et al. (2012) | 270.12 | 2.875 | – | 0.22 | -8.9 | – |
| Loktin & Popova (2017) | 270.27 | 2.9 | – | 0.47 | 9.1 | -4.6 |
| Cantat-Gaudin et al. (2018) | 270.598 | 3.26 | 1.786 | 0.637 | -8.668 | – |
| Bica et al. (2019) | 270.277 | 2.888 | – | – | – | – |
| Soubiran et al. (2018) | 270.598 | 3.26 | – | – | – | 5.28 |
| Dias et al. (2019) | 180.6 | 3.26 | 1.786 | 0.637 | -8.668 | -3.243 |
| Cantat-Gaudin et al. (2020) | 270.598 | 3.26 | 1.786 | 0.637 | -8.668 | – |
| Dias et al. (2021) | 270.987 | 3.354 | 1.787 | 0.659 | -8.659 | 8.441 |
| He et al. (2022) | 270.372 | 3.011 | 1.8 | 0.655 | -8.862 | – |
| Hunt & Reffert (2023) | 270.318 | 3.193 | 1.812 | 0.606 | -8.818 | -9.435 |
| Cavallo et al. (2024) | 270.349 | 3.479 | 1.81 | – | – | – |
| Hunt & Reffert (2024) | 270.318 | 3.193 | 1.812 | 0.606 | -8.818 | -9.435 |
| Alfonso et al. (2024) | 270.404 | 3.327 | 1.782 | 0.612 | -8.815 | – |
| Almeida et al. (2025) | 270.987 | 3.354 | – | – | – | – |
| UCC | 270.414 | 3.165 | 1.794 | 0.648 | -8.828 | -7.422 |
Estimated members
Explore data in Colab
Fundamental parameters
| Reference | Values |
|---|---|
| Dambis (1999) | E_B-V_=0.21, DM0=7.43, log_age_=7.2 |
| Dias et al. (2002) | E(B-V)=0.193, Dist=249.0, Age=7.506 |
| Piskunov et al. (2007) | E(B-V)=0.16, Dist=640, logt=7.45, logM=3.592 |
| Piskunov et al. (2008) | E(B-V)=0.16, Dist=640, logt=7.45, logM=3.944, logMA=3.87 |
| Kharchenko et al. (2012) | e_bv=0.16, distance=640, log_age=7.45 |
| Loktin & Popova (2017) | E(B-V)=0.193, Dist=254, logt=7.506 |
| Cantat-Gaudin et al. (2018) | dmode=551.0 |
| Soubiran et al. (2018) | dmode=551.0 |
| Dias et al. (2019) | E(B-V)=0.16, Dist=604, logAge=7.573, Z=0.027 |
| Cantat-Gaudin et al. (2020) | AVNN=0.51, DistPc=546.0, AgeNN=7.57 |
| Dias et al. (2021) | Av=0.575, Dist=552, logage=7.737, [Fe/H]=0.186 |
| He et al. (2022) | A0=0.85, logAge=7.25 |
| Hunt & Reffert (2023) | AV50=0.409, diffAV50=0.666, MOD50=8.61, logAge50=7.155 |
| Cavallo et al. (2024) | AV50=0.91, dMod50=8.79, logAge50=6.88, [Fe/H]50=-0.1 |
| Hunt & Reffert (2024) | MassJ=181.358, MassTot=388.969 |
| Alfonso et al. (2024) | AV=0.50875, MOD=8.68997, logAge=7.44553, Z=0.18564 |
| Almeida et al. (2025) | AV=0.575, Dist=552, logAge=7.737, MassRk=686.4 |
Search coordinates in Bayestar19
Cluster region map
Objects with shared members
| Cluster | % | RA | DEC | Plx | pmRA | pmDE | Rv | UTI |
|---|---|---|---|---|---|---|---|---|
| CWWDL 14664 | 72.0 | 270.36 | 3.03 | 1.79 | 0.64 | -8.88 | -7.34 | 0.18 |
| HSC 297 | 5.3 | 270.7 | 2.76 | 1.94 | 0.42 | -8.66 | -4.84 | 0.12 |