HSC 1291
0.16
UTI
0.0
CN
0.06
Cdens
0.62
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
17
Core radius and density
2.7 [pc], 0.3 [pc-2]
- CN 0.0 Sparse
- Cdens 0.06 Very loose
- CC3 0.62 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
HSC 1291 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by moderate 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 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 | 71.255 | 38.345 | 1.529 | -1.313 | -2.558 | -6.117 |
| Zhang et al. | 2024 | 71.224 | 38.338 | â | â | â | â |
| Hunt & Reffert | 2024 | 71.224 | 38.338 | 1.532 | -1.288 | -2.507 | -7.592 |
| Cavallo et al. | 2024 | 71.469 | 38.299 | 1.531 | â | â | â |
| Hunt & Reffert | 2023 | 71.224 | 38.338 | 1.532 | -1.288 | -2.507 | -7.592 |
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 | 0.61 | 1.96 | 0.5 | 180 | -0.144 | 60 | â | â |
| Zhang et al. | 2024 | â | â | â | â | 0.071(1) | â | â | â |
| Hunt & Reffert | 2024 | 0.61 | 1.96 | 0.50 | 180 | â | 60(1) | â | â |
| Cavallo et al. | 2024 | 0.65 | 2.31 | â | 138 | -0.360 | â | â | â |
| Hunt & Reffert | 2023 | 0.61 | 1.96 | 0.50 | 180 | 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 G18, along with HSC_1268 and COIN-Gaia_11.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).