FoF 1981
(LP 1981)
0.06
UTI
0.0
CN
0.05
Cdens
0.25
CC3
0.0
Clit
1.0
Cdup
Radius (P>50% members)
6.2 [arcmin]
- CN 0.0 Sparse
- Cdens 0.05 Very loose
- CC3 0.25 Low quality
- Clit 0.0 Rarely studied
- Cdup 1.0 Unique
Overview
FoF 1981 is a sparse, very loose object of low C3 quality. Its parallax locates it at a large* distance, above the mid-plane, affected by low extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster (see Parameters). It is rarely studied in the literature.
(*): The parallax distance estimate (~5.42 kpc) differs significantly from the median photometric distance (~3.84 kpc).
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.
Distant
Low extinction
Massive
Near-solar metallicity
Intermediate age
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | â | 111.842 | -8.278 | 0.185 | -1.247 | 0.976 | 94.225 |
| Almeida et al. | 2025 | 111.838 | -8.264 | â | â | â | â |
| Dias et al. | 2021 | 111.838 | -8.264 | 0.224 | -1.229 | 0.991 | 92.11 |
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] | Bfr | BSS |
|---|---|---|---|---|---|---|---|---|---|
| Almeida et al. | 2025 | 3.84 | 0.67 | â | 826 | â | 1710 | â | â |
| Dias et al. | 2021 | 3.84 | 0.67 | â | 826 | -0.186 | â | â | â |
Almeida et al. (2025)
Mass determination: good fit. Isochrone match: intermediate fit.