NGC 1641
0.13
UTI
0.0
CN
0.0
Cdens
0.62
CC3
0.0
Clit
1.0
Cdup
Radius (P>50% members)
7.6 [arcmin]
- CN 0.0 Sparse
- Cdens 0.0 Very loose
- CC3 0.62 Intermediate quality
- Clit 0.0 Rarely studied
- Cdup 1.0 Unique
Overview
NGC 1641 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a very large* distance, well below the mid-plane, affected by low extinction. It is catalogued as an old cluster (see Parameters). It is rarely studied in the literature, with no articles listed in the last 9 years.
(*): The parallax distance estimate (~91.74 kpc) differs significantly from the median photometric distance (~1.41 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.
Relatively close
Low extinction
Old
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | â | 68.91 | -65.776 | 0.011 | 1.806 | -0.295 | 269.496 |
| Loktin & Popova | 2017 | 68.88 | -65.75 | â | 4.453 | 6.491 | 31.2 |
| Dias et al. | 2002 | 68.883 | -65.75 | â | 6.48 | 8.5 | â |
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 |
|---|---|---|---|---|---|---|---|---|---|
| Loktin & Popova | 2017 | 1.83 | 0.52 | â | 1148 | â | â | â | â |
| Dias et al. | 2002 | 0.98 | 0.32 | â | 3311 | â | â | â | â |
Cantat-Gaudin et al. (2020)
Originally associated with the LMC; later considered a Milky Way open cluster remnant. Sparse CMD and uncertain parameters; listed as a remnant in recent catalogues. More details in Appendix A of the article.