Theia 458
0.11
UTI
0.26
CN
0.1
Cdens
0.12
CC3
0.03
Clit
1.0
Cdup
Nm (P>50%)
26
Core radius and density
3.0 [pc], 0.5 [pc-2]
- CN 0.26 Poorly populated
- Cdens 0.1 Very loose
- CC3 0.12 Very 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 458 is a poorly populated, very loose object of very 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 | 106.275 | -16.997 | 1.68 | -6.552 | 0.075 | 22.904 |
| Cavallo et al. | 2024 | 106.41 | -17.094 | 1.687 | â | â | â |
| Hunt & Reffert | 2023 | 106.24 | -16.827 | 1.663 | -6.452 | 0.027 | 20.652 |
| Kounkel & Covey | 2019 | 106.275 | -16.53 | 1.885 | â | â | 4.921 |
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 | 0.57 | 0.23 | 0.95 | 138 | -0.050 | â | â | â |
| Cavallo et al. | 2024 | 0.60 | 0.43 | â | 63 | -0.050 | â | â | â |
| Hunt & Reffert | 2023 | 0.57 | 0.21 | 0.95 | 138 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.53 | 0.23 | â | 193 | â | â | â | â |
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.99 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).