Theia 1920
0.11
UTI
0.0
CN
0.17
Cdens
0.38
CC3
0.0
Clit
0.96
Cdup
Stellar density (N50/rad)
0.9 [N/pc2]
- CN 0.0 Sparse
- Cdens 0.17 Very loose
- CC3 0.38 Low quality
- Clit 0.0 Rarely studied
- Cdup 0.96 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 1920 is a sparse, very loose object of low C3 quality. Its parallax locates it at a relatively close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It was recently reported in the literature.
Note: This is a unique object, which shares a very small percentage of members with at least one previously reported entry. See table with shared members information.
â ī¸ Warning: the low UTI value and no obvious signs of duplication (Cdup=0.96) 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 | 304.425 | 38.853 | 0.873 | -3.08 | -7.005 | -4.557 |
| Zhang et al. | 2024 | 304.467 | 38.725 | â | â | â | â |
| Cavallo et al. | 2024 | 304.441 | 38.981 | 0.874 | â | â | â |
| Hunt & Reffert | 2023 | 304.467 | 38.725 | 0.876 | -3.034 | -6.98 | -6.625 |
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 | 1.115 | 1.03 | 1.57 | 12 | -0.056 | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | -0.321(1) | â | â | â |
| Cavallo et al. | 2024 | 1.12 | 1.00 | â | 16 | 0.210 | â | â | â |
| Hunt & Reffert | 2023 | 1.11 | 1.06 | 1.57 | 9 | 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 a moving group.