OCSN 99
0.09
UTI
0.34
CN
0.12
Cdens
0.0
CC3
0.0
Clit
1.0
Cdup
Nm (P>50%)
34
Core radius and density
2.6 [pc], 0.6 [pc-2]
- CN 0.34 Poorly populated
- Cdens 0.12 Very loose
- CC3 0.0 Very low quality
- Clit 0.0 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
OCSN 99 is a poorly populated, very loose object of very low C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as an intermediate-age cluster (see Parameters). It was recently reported in the literature.
â ī¸ Warning: the low UTI value and no obvious signs of duplication (Cdup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 255.542 | -30.804 | 7.358 | -9.973 | -48.975 | 1.405 |
| Qin et al. | 2023 | 255.56 | -30.54 | 7.34 | -9.87 | -49.0 | -0.25 |
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 | 0.14 | 0.13 | â | 141 | â | â | â | â |
| Qin et al. | 2023 | 0.14 | 0.13 | â | 141 | â | â | â | â |
Palma et al. (2025)
Part of multiple system G176, along with HSC_2900, HSC_2963 and Theia_67.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.99 (50th percentile).
Hunt & Reffert (2023)
Classified as moving group. CMD class: 0.99 (50th percentile).