Theia 865
0.07
UTI
0.0
CN
0.05
Cdens
0.25
CC3
0.03
Clit
1.0
Cdup
Nm (P>50%)
22
Core radius and density
1.1 [pc], 0.2 [pc-2]
- CN 0.0 Sparse
- Cdens 0.05 Very loose
- CC3 0.25 Low quality
- Clit 0.03 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
Theia 865 is a sparse, very loose object of low C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It is rarely studied 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 | 214.921 | -66.716 | 1.448 | -11.284 | -9.48 | -17.009 |
| Cavallo et al. | 2024 | 211.952 | -66.996 | 1.433 | â | â | â |
| Hunt & Reffert | 2023 | 215.46 | -66.627 | 1.424 | -11.268 | -9.308 | -15.15 |
| Kounkel & Covey | 2019 | 213.583 | -67.048 | 1.347 | â | â | -20.184 |
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 | 0.67 | 0.64 | 0.47 | 136 | -0.090 | â | â | â |
| Cavallo et al. | 2024 | 0.67 | 0.74 | â | 129 | -0.090 | â | â | â |
| Hunt & Reffert | 2023 | 0.67 | 0.29 | 0.47 | 136 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.74 | 0.64 | â | 399 | â | â | â | â |
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 1.00 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).