Theia 240
0.23
UTI
0.0
CN
0.26
Cdens
0.75
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
21
Core radius and density
1.7 [pc], 1.3 [pc-2]
- CN 0.0 Sparse
- Cdens 0.26 Loose
- CC3 0.75 High 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 240 is a sparse, loose object of high 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, 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 | 279.283 | -20.38 | 2.433 | -0.027 | -4.909 | -12.611 |
| Hunt & Reffert | 2024 | 279.192 | -20.357 | 2.387 | 0.056 | -4.837 | -13.036 |
| Cavallo et al. | 2024 | 279.093 | -20.055 | 2.394 | â | â | â |
| Hunt & Reffert | 2023 | 279.192 | -20.357 | 2.387 | 0.056 | -4.837 | -13.036 |
| Kounkel & Covey | 2019 | 278.612 | -19.805 | 2.398 | â | â | 6.828 |
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 | 0.41 | 1.0 | 0.74 | 102 | -0.190 | 54 | â | â |
| Hunt & Reffert | 2024 | 0.40 | 1.00 | 0.74 | 110 | â | 54(1) | â | â |
| Cavallo et al. | 2024 | 0.42 | 1.60 | â | 25 | -0.190 | â | â | â |
| Hunt & Reffert | 2023 | 0.40 | 1.00 | 0.74 | 110 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.42 | 0.86 | â | 93 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Palma et al. (2025)
Classified as optical pair P575, along with Theia_828.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.93 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.93 (50th percentile).