OC 0018
0.33
UTI
0.0
CN
1.0
Cdens
0.5
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
21
Core radius and density
0.8 [pc], 5.1 [pc-2]
- CN 0.0 Sparse
- Cdens 1.0 Very dense
- CC3 0.5 Intermediate quality
- Clit 0.06 Rarely 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
OC 0018 is a sparse, very dense object of intermediate C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is rarely studied in the literature.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 272.03 | -19.406 | 0.536 | 0.958 | -1.738 | -92.274 |
| Hunt & Reffert | 2024 | 272.031 | -19.408 | 0.545 | 0.912 | -1.749 | -92.274 |
| Cavallo et al. | 2024 | 272.028 | -19.412 | 0.545 | â | â | â |
| Hunt & Reffert | 2023 | 272.031 | -19.408 | 0.545 | 0.912 | -1.749 | -92.274 |
| Hao et al. | 2022 | 272.027 | -19.411 | 0.538 | 0.996 | -1.704 | -2.398 |
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 | 1.8 | 3.64 | 2.41 | 8 | -0.079 | 426 | â | â |
| Hunt & Reffert | 2024 | 1.80 | 3.39 | 2.41 | 8 | â | 426(1) | â | â |
| Cavallo et al. | 2024 | 1.32 | 3.89 | â | 26 | -0.390 | â | â | â |
| Hunt & Reffert | 2023 | 1.80 | 3.39 | 2.41 | 8 | â | â | â | â |
| Hao et al. | 2022 | â | 5.12 | â | 5 | 0.233 | 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 G49, along with Theia_2045, CWNU_1409 and CWNU_2188.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.24 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.24 (50th percentile).