Melotte 18
(Collinder 38; NGC 1245; FSR 0648; OCL 389; MWSC 264; FoF 27)
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UTI:
UCC Trust Index
Melotte 18 is a very rich, very dense object of very high C3 quality. It is very well-studied in the literature. This object shares a very small percentage of members with 3 later reported entries. |
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| C3 | N_50 |
r_50 |
||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AA | 1163 | 5.5 | ||||||||||||
Positions
| Reference | RA | DEC | Plx | pmRA | pmDE | Rv |
|---|---|---|---|---|---|---|
| Dias et al. (2002) | 48.675 | 47.237 | – | 1.83 | -1.92 | -29.7 |
| Chen et al. (2003) | 48.674 | 47.25 | – | – | – | – |
| Kharchenko et al. (2012) | 48.7 | 47.253 | – | -2.06 | 1.66 | – |
| Loktin & Popova (2017) | 48.675 | 47.237 | – | -1.897 | 1.699 | -29.5 |
| Bica et al. (2019) | 48.691 | 47.231 | – | – | – | – |
| Liu & Pang (2019) | 48.673 | 47.237 | 0.295 | 0.504 | -1.544 | – |
| Cantat-Gaudin et al. (2020) | 48.691 | 47.235 | 0.289 | 0.504 | -1.579 | – |
| Donor et al. (2020) | 48.7 | 47.253 | – | 0.51 | -1.63 | -29.0 |
| Dias et al. (2021) | 48.684 | 47.236 | 0.289 | 0.512 | -1.568 | -30.377 |
| Jaehnig et al. (2021) | 48.693 | 47.236 | 0.314 | 0.499 | -1.582 | – |
| Hunt & Reffert (2023) | 48.711 | 47.235 | 0.297 | 0.47 | -1.66 | -32.844 |
| Cavallo et al. (2024) | 48.685 | 47.233 | 0.297 | – | – | – |
| Hunt & Reffert (2024) | 48.711 | 47.235 | 0.297 | 0.47 | -1.66 | -32.844 |
| Hu & Soubiran (2025) | 48.685 | 47.233 | – | – | – | – |
| UCC | 48.694 | 47.23 | 0.299 | 0.474 | -1.648 | -29.767 |
Estimated members
Explore data in Colab
Fundamental parameters
| Reference | Values |
|---|---|
| Dias et al. (2002) | E(B-V)=0.24, Dist=2818.0, Age=9.03, [Fe/H]=-0.04 |
| Chen et al. (2003) | E(B-V)=0.3, HDis=2876, Age=0.5, [Fe/H]_1=0.1 |
| Kharchenko et al. (2012) | e_bv=0.25, distance=3000, log_age=9.025, metallicity=0.1 |
| Loktin & Popova (2017) | E(B-V)=0.306, Dmod=12.329, logt=8.707 |
| Liu & Pang (2019) | Age=1.02, Z=0.5 |
| Cantat-Gaudin et al. (2020) | AVNN=0.5, DMNN=12.53, AgeNN=9.08 |
| Donor et al. (2020) | Fe/H=-0.08 |
| Dias et al. (2021) | Av=0.831, Dist=2763, logage=9.079, [Fe/H]=-0.001 |
| Hunt & Reffert (2023) | AV50=0.545, diffAV50=0.359, MOD50=12.643, logAge50=8.991 |
| Cavallo et al. (2024) | AV50=1.0, dMod50=12.24, logAge50=8.95, [Fe/H]50=0.08 |
| Hunt & Reffert (2024) | MassJ=5336.68 |
| Hu & Soubiran (2025) | MA22=-0.1, MA23f=-0.34, MA23g=-0.12, MZ23=-0.04, MK24=-0.27, MF24=-0.15 |
Search coordinates in Bayestar19
Cluster region
Objects with shared members
| Cluster | % | RA | DEC | Plx | pmRA | pmDE | Rv | UTI |
|---|---|---|---|---|---|---|---|---|
| OC 0271 | 3.4 | 48.68 | 47.23 | 0.24 | 0.44 | -1.66 | -31.19 | 0.0 |
| OC 0272 | 2.1 | 48.68 | 47.24 | 0.41 | 0.57 | -1.67 | -31.83 | 0.0 |
| CWNU 1783 | 0.5 | 48.46 | 47.18 | 0.34 | 0.48 | -0.98 | -16.24 | 0.03 |