Theia 834
0.17
UTI
0.37
CN
0.08
Cdens
0.25
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
37
Core radius and density
2.1 [pc], 0.4 [pc-2]
- CN 0.37 Poorly populated
- Cdens 0.08 Very loose
- CC3 0.25 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
Theia 834 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a very close distance, above the mid-plane, affected by low 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 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 | 96.481 | 29.865 | 2.119 | -6.585 | -3.966 | 4.681 |
| Zhang et al. | 2024 | 96.638 | 29.887 | â | â | â | â |
| Cavallo et al. | 2024 | 96.385 | 29.702 | 2.103 | â | â | â |
| Hunt & Reffert | 2023 | 96.638 | 29.887 | 2.104 | -6.616 | -3.928 | 5.562 |
| Kounkel & Covey | 2019 | 95.95 | 29.264 | 2.073 | â | â | -14.268 |
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 | 0.48 | 0.22 | 0.5 | 269 | 0.188 | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | -0.004(1) | â | â | â |
| Cavallo et al. | 2024 | 0.49 | 0.41 | â | 269 | 0.380 | â | â | â |
| Hunt & Reffert | 2023 | 0.45 | 0.22 | 0.50 | 218 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.48 | 0.15 | â | 440 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.83 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.83 (50th percentile).