HSC 2900
0.20
UTI
0.25
CN
0.11
Cdens
0.62
CC3
0.0
Clit
1.0
Cdup
Nm (P>50%)
25
Core radius and density
2.5 [pc], 0.6 [pc-2]
- CN 0.25 Poorly populated
- Cdens 0.11 Very loose
- CC3 0.62 Intermediate 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
HSC 2900 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the age parameter (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 | 267.024 | -40.114 | 7.038 | -7.611 | -29.657 | -1.371 |
| Cavallo et al. | 2024 | 266.856 | -40.141 | 6.995 | â | â | â |
| Hunt & Reffert | 2023 | 266.581 | -40.053 | 6.993 | -7.775 | -29.552 | -0.313 |
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 | 0.985 | 0.47 | 28 | 0.050 | â | â | â |
| Cavallo et al. | 2024 | 0.14 | 1.42 | â | 48 | 0.050 | â | â | â |
| Hunt & Reffert | 2023 | 0.14 | 0.55 | 0.47 | 7 | â | â | â | â |
Palma et al. (2025)
Part of multiple system G176, along with HSC_2963, Theia_67 and OCSN_99.
Cavallo et al. (2024)
Silver sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.98 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.98 (50th percentile).