HSC 2691
0.19
UTI
0.29
CN
0.16
Cdens
0.38
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
29
Core radius and density
1.7 [pc], 0.8 [pc-2]
- CN 0.29 Poorly populated
- Cdens 0.16 Very loose
- CC3 0.38 Low 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
HSC 2691 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the age and metallicity parameters (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 | 230.628 | -58.146 | 0.99 | -1.586 | -3.995 | -10.537 |
| Hu & Soubiran | 2025 | 230.661 | -58.122 | â | â | â | â |
| Hunt & Reffert | 2024 | 230.538 | -58.168 | 0.989 | -1.617 | -4.018 | -10.854 |
| Cavallo et al. | 2024 | 230.662 | -58.122 | 0.991 | â | â | â |
| Hunt & Reffert | 2023 | 230.538 | -58.168 | 0.989 | -1.617 | -4.018 | -10.854 |
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 | 0.96 | 2.02 | 2.02 | 84 | 0.210 | 132 | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.130(5) | â | â | â |
| Hunt & Reffert | 2024 | 0.96 | 2.02 | 2.02 | 84 | â | 132(1) | â | â |
| Cavallo et al. | 2024 | 0.92 | 1.45 | â | 617 | 0.550 | â | â | â |
| Hunt & Reffert | 2023 | 0.96 | 2.02 | 2.02 | 84 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Palma et al. (2025)
Classified as tidal capture (resonant trapping pair) P230, along with HSC_2708.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.97 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.97 (50th percentile).