Pozzo 1

(FoF 2394)

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0.95 UTI
1.0
CN
1.0
Cdens
1.0
CC3
0.87
Clit
1.0
Cdup
Nm (P>50%) 574
Core radius and density 0.5 [pc], 46 [pc-2]
C3 classification AA
  • CN 1.0 Very rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.87 Well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
Pozzo 1 is a very rich, very dense object of very 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, very young cluster, but with a large variance across recent sources for the absorption, metallicity, and mass parameters (see Parameters). It is well-studied in the literature.

Note: This object shares a large percentage of members with 6 later reported entries. See table with shared members information.

Yan et al. (2026)
Number of WDs: expected from single-star evolution N=0, with probability of formation through binary evolution >=0.5 N=1.

Liu et al. (2025)
Classified as primordial binary cluster 333 along with NGC_2547, and of multiple system 76 along with Theia_1918, NGC_2547 and OC_0479.

Palma et al. (2025)
Part of multiple system G217, along with Theia_1918, NGC_2547 and OC_0479.

Almeida et al. (2025)
Mass determination: good fit. Isochrone match: good fit. Gold sample.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.2373, e_all=0.2209.

Rain et al. (2021)
This cluster was include in (Dias et al., 2002A&A...389..871D, Cat. B/ocl) however, parameters log(t)=7.143, E(b-v)=0.079, Z=0.037 were taken from Monteiro & Dias (2019MNRAS.487.2385M).

Bica et al. (2019)
Web updates in DAML02, some were later removed (2003 to 2010).

Data
🔍 Search references for Pozzo 1 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 122.385 -47.332 2.888 -6.407 9.606 15.219
Yan et al. 2026 122.375 -47.354 2.847 -6.364 9.437 –
Liu et al. 2025 122.37 -47.35 2.85 -6.36 9.44 14.0
Li et al. 2025 122.374 -47.335 2.853 -6.516 9.53 –
Wei et al. 2025 122.367 -47.364 2.916 -6.48 9.724 –
Almeida et al. 2025 122.331 -47.301 – – – –
Alfonso et al. 2024 122.315 -47.379 2.796 -6.298 9.359 –
Swiggum et al. 2024 122.375 -47.354 2.847 -6.364 9.437 15.659
Hunt & Reffert 2024 122.375 -47.354 2.847 -6.364 9.437 14.001
Celli et al. 2024 122.374 -47.335 – – – –
Cavallo et al. 2024 122.33 -47.389 2.845 – – –
Hunt & Reffert 2023 122.375 -47.354 2.847 -6.364 9.437 14.001
Almeida et al. 2023 122.344 -47.315 – – – –
Cordoni et al. 2023 122.331 -47.301 2.855 -6.475 9.587 –
He et al. 2022 122.494 -46.623 2.847 -6.549 9.497 –
Rain et al. 2021 122.374 -47.335 2.853 -6.516 9.53 –
Dias et al. 2021 122.331 -47.301 2.855 -6.475 9.587 18.69
Cantat-Gaudin et al. 2020 122.374 -47.335 2.853 -6.516 9.53 –
Cantat-Gaudin & Anders 2020 122.374 -47.335 2.853 -6.516 9.53 –
Liu & Pang 2019 122.246 -47.391 2.778 -6.331 9.279 –
Dias et al. 2019 122.375 -47.335 2.853 -6.516 9.53 19.189
Monteiro & Dias 2019 122.374 -47.335 – -6.544 9.568 2.062
Bossini et al. 2019 122.374 -47.335 – – – –
Soubiran et al. 2018 122.374 -47.335 – – – 18.67
Cantat-Gaudin et al. 2018 122.374 -47.335 2.853 -6.516 9.53 –
Dias et al. 2018 – – – -5.22 5.53 –
Sampedro et al. 2017 122.383 -47.337 – -2.27 4.12 –
Dias et al. 2014 122.383 -47.337 – -2.14 3.77 –

💡 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 99999– 0.34 0.21 0.98 12 -0.059 436 0.23 0
Yan et al. 2026 – – – 9 – – – –
Liu et al. 2025 0.34 0.07 – 15 – – – –
Li et al. 2025 0.31 0.20 – 13 -0.144 – – –
Wei et al. 2025 0.25 1.16 – 7 0.500 575 0.49 –
Almeida et al. 2025 0.34 0.16 – 12 – 350 – –
Alfonso et al. 2024 0.33 0.07 – 12 -0.069 – – –
Swiggum et al. 2024 0.35 – – 9 – 436 – –
Hunt & Reffert 2024 0.35 0.35 0.98 9 – 138(1) – –
Celli et al. 2024 – – – 10 – 343 – –
Cavallo et al. 2024 0.35 0.70 – 5 -0.210 – – –
Hunt & Reffert 2023 0.35 0.35 0.98 9 – – – –
Almeida et al. 2023 0.34 0.27 – 13 -0.042 610(1) 0.23 –
Cordoni et al. 2023 0.34 0.16 – 12 -0.069 754 0.21 0(1)
He et al. 2022 – 0.20 – 11 – – – –
Spina et al. 2022 – – – – -0.050 – – –
Rain et al. 2021 0.35 0.22 – 14 – – – 0
Dias et al. 2021 0.34 0.16 – 12 -0.069 – – –
Cantat-Gaudin et al. 2020 0.33 0.07 – 10 – – – –
Kounkel et al. 2020 0.35 0.55 – 18 – – – –
Cantat-Gaudin & Anders 2020 0.35 – – – – – – –
Liu & Pang 2019 – – – 7 0.500 – – –
Dias et al. 2019 0.34 0.25 – 12 -0.140 – – –
Monteiro & Dias 2019 0.35 0.25 – 14 0.037 – – –
Bossini et al. 2019 0.32 0.16 – 13 0.000 – – –
Soubiran et al. 2018 0.35 – – – – – – –
Cantat-Gaudin et al. 2018 0.35 – – – – – – –

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

Cluster % RA DEC Plx pmRA pmDE Rv UTI
OCSN 254 100.0 122.38 -47.34 2.89 -6.4 9.6 14.61 0.07
CWWDL 14592 4.4 123.01 -46.3 2.79 -6.35 9.19 15.12 0.13
CWWDL 14595 4.4 122.36 -46.77 2.73 -6.23 9.01 16.28 0.08
OC 0478 4.4 122.65 -47.46 2.98 -6.75 9.8 14.78 0.0
CWWDL 14586 4.0 121.61 -48.0 2.74 -6.0 9.04 18.68 0.21
CWWDL 14593 2.1 123.1 -46.18 2.87 -6.51 9.41 15.29 0.09

💡 Note: The % column shows the percentage of members that Pozzo 1 shares with each listed object.

Visualization
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Pozzo 1 UCC
Pozzo 1 HUNT23
Pozzo 1 CANTAT20
Galactocentric position diagram