Mamajek 2
(mu Oph Cluster; MWSC 2650)
0.60
UTI
0.75
CN
0.74
Cdens
0.75
CC3
0.39
Clit
1.0
Cdup
Nm (P>50%)
110
Core radius and density
1.3 [pc], 3.7 [pc-2]
- CN 0.75 Rich
- Cdens 0.74 Moderately dense
- CC3 0.75 High quality
- Clit 0.39 Poorly studied
- Cdup 1.0 Unique
đĨ Members
đ Colab
đŦ Bayestar19
MOCA
đ CDS
đ Simbad
đ CDS (Îą, δ)
đ Simbad (Îą, δ)
MOCA
đ CDS
đ Simbad
đ CDS (Îą, δ)
đ Simbad (Îą, δ)
Overview
Mamajek 2 is a rich, moderately dense object of high C3 quality. Its parallax locates it at a very close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is poorly studied in the literature.
Note: This object shares a large percentage of members with 2 later reported entries. See table with shared members information.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 264.462 | -7.925 | 5.046 | -10.846 | -20.718 | -17.901 |
| Zhang et al. | 2024 | 264.36 | -8.016 | â | â | â | â |
| Hunt & Reffert | 2024 | 264.36 | -8.016 | 4.879 | -10.069 | -19.5 | -16.534 |
| Cavallo et al. | 2024 | 265.835 | -6.227 | 4.877 | â | â | â |
| Hunt & Reffert | 2023 | 264.36 | -8.016 | 4.879 | -10.069 | -19.5 | -16.534 |
| He et al. | 2022 | 264.347 | -8.014 | 5.118 | -11.05 | -20.922 | â |
| Bica et al. | 2019 | 264.501 | -8.107 | â | â | â | â |
| Loktin & Popova | 2017 | 264.495 | -8.113 | â | -0.956 | -1.369 | -18.5 |
| Sampedro et al. | 2017 | 264.5 | -8.112 | â | -2.79 | -7.83 | â |
| Joshi et al. | 2016 | 264.472 | -8.085 | â | â | â | â |
| Dias et al. | 2014 | 264.5 | -8.112 | â | -3.85 | -9.11 | â |
| Gozha et al. | 2012 | 264.5 | -8.112 | â | â | â | â |
| Kharchenko et al. | 2007 | 264.49 | -8.11 | â | 0.08 | â | â |
| Dias et al. | 2002 | 264.5 | -8.112 | â | -11.88 | -20.81 | -18.5 |
đĄ Note: The UCC values are estimated from its identified members.
| Reference | Year | Dist [kpc] | Av [mag] | DAv [mag] | Age [Myr] | [Fe/H] [dex] | Mass [Msun] | Bfrac | BSS |
|---|---|---|---|---|---|---|---|---|---|
| UCC | 99999â | 0.21 | 1.0 | 1.77 | 112 | 0.076 | 91 | â | â |
| Zhang et al. | 2024 | â | â | â | â | -0.077(1) | â | â | â |
| Hunt & Reffert | 2024 | 0.21 | 0.75 | 1.77 | 99 | â | 91(1) | â | â |
| Cavallo et al. | 2024 | 0.21 | 1.08 | â | 74 | 0.230 | â | â | â |
| Hunt & Reffert | 2023 | 0.21 | 0.75 | 1.77 | 99 | â | â | â | â |
| He et al. | 2022 | â | 1.00 | â | 71 | â | â | â | â |
| Loktin & Popova | 2017 | 0.37 | 1.84 | â | 210 | â | â | â | â |
| Joshi et al. | 2016 | 0.17 | 0.98 | â | 126 | â | â | â | â |
| Gozha et al. | 2012 | 0.16 | â | â | 126 | â | â | â | â |
| Dias et al. | 2002 | 0.16 | 2.52 | â | 126 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Palma et al. (2025)
Part of multiple system G204, along with Theia_70 and HSC_95.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.88 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.88 (50th percentile).
Bica et al. (2019)
Web updates in DAML02, some were later removed (2003 to 2010).