Alessi 72
0.23
UTI
0.42
CN
0.05
Cdens
0.5
CC3
0.1
Clit
1.0
Cdup
Nm (P>50%)
42
Core radius and density
5.0 [pc], 0.3 [pc-2]
- CN 0.42 Poorly populated
- Cdens 0.05 Very loose
- CC3 0.5 Intermediate quality
- Clit 0.1 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
Alessi 72 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It is rarely studied in the literature.
Note: This object shares a significant percentage of members with a later reported entry. See table with shared members information.
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 | 106.618 | -16.162 | 0.765 | -3.089 | 1.769 | 36.403 |
| Liu et al. | 2025 | 106.54 | -16.07 | 0.76 | -3.07 | 1.75 | 31.26 |
| Hunt & Reffert | 2024 | 106.537 | -16.068 | 0.762 | -3.069 | 1.745 | 31.258 |
| Cavallo et al. | 2024 | 106.592 | -16.194 | 0.764 | â | â | â |
| Hunt & Reffert | 2023 | 106.537 | -16.068 | 0.762 | -3.069 | 1.745 | 31.258 |
| Bica et al. | 2019 | 106.51 | -16.057 | â | â | â | â |
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 | 1.25 | 0.525 | 0.67 | 43 | -0.260 | 148 | â | â |
| Liu et al. | 2025 | 1.60 | 0.21 | â | 30 | â | â | â | â |
| Hunt & Reffert | 2024 | 1.25 | 0.52 | 0.67 | 51 | â | 148(1) | â | â |
| Cavallo et al. | 2024 | 1.25 | 0.68 | â | 35 | -0.260 | â | â | â |
| Hunt & Reffert | 2023 | 1.25 | 0.53 | 0.67 | 51 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Liu et al. (2025)
Classified as primordial binary cluster 24 along with HSC_1808, and as primordial binary cluster 65 along with CWNU_281, and of multiple system 12 along with CWNU_281 and HSC_1808.
Palma et al. (2025)
Classified as genetic pair P183, along with HSC_1808.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).
Bica et al. (2019)
List of clusters and alike reported by B. Alessi.