Theia 1918
0.03
UTI
0.0
CN
0.17
Cdens
0.5
CC3
0.06
Clit
0.2
Cdup
Nm (P>50%)
24
Core radius and density
1.2 [pc], 0.9 [pc-2]
- CN 0.0 Sparse
- Cdens 0.17 Very loose
- CC3 0.5 Intermediate quality
- Clit 0.06 Rarely studied
- Cdup 0.2 Likely duplicate
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 1918 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It was recently reported in the literature.
â ī¸ Warning: This is likely a duplicate object, which shares a large percentage of members with at least one previously reported entry. See table with shared members information.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 129.259 | -48.129 | 2.446 | -10.479 | 2.242 | 11.516 |
| Liu et al. | 2025 | 129.2 | -48.12 | 2.44 | -10.64 | 2.0 | 11.44 |
| Swiggum et al. | 2024 | 129.195 | -48.117 | 2.44 | -10.636 | 2.0 | 11.443 |
| Cavallo et al. | 2024 | 130.539 | -47.925 | 2.445 | â | â | â |
| Hunt & Reffert | 2023 | 129.195 | -48.117 | 2.44 | -10.636 | 2.0 | 11.439 |
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 | 0.415 | 0.23 | 0.67 | 24 | -0.160 | 208 | â | â |
| Liu et al. | 2025 | 0.46 | 0.11 | â | 37 | â | â | â | â |
| Swiggum et al. | 2024 | 0.41 | â | â | 24 | â | 208 | â | â |
| Cavallo et al. | 2024 | 0.42 | 0.57 | â | 12 | -0.160 | â | â | â |
| Hunt & Reffert | 2023 | 0.40 | 0.23 | 0.67 | 24 | â | â | â | â |
Liu et al. (2025)
Classified as primordial binary cluster 359 along with NGC_2547, and of multiple system 76 along with Pozzo_1, NGC_2547 and OC_0479.
Palma et al. (2025)
Part of multiple system G217, along with NGC_2547, OC_0479 and Pozzo_1.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.91 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.91 (50th percentile).