Berkeley 81

(MWSC 3039; OCL 88)

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0.96 UTI
0.8
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
Nm (P>50%) 230
Core radius and density 1.4 [pc], 7.0 [pc-2]
C3 classification AA
  • CN 0.8 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 MOCAMOCA πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
Berkeley 81 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by high extinction. It is catalogued as a massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the age, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

Note: This object contains blue stragglers according to at least one source.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.81 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.81 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.0666, e_all=0.0436.

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg13' along with NGC 6735.

Ahumada & Lapasset (2007)
Only straggler candidates inside a radius of 5' around the centre of coordinates have been considered. The red limit of the blue straggler area is (B-V)=1.15.

Data
πŸ” Search references for Berkeley 81 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 285.418 -0.454 0.248 -1.153 -1.929 46.795
Hu & Soubiran 2025 285.426 -0.44 – – – –
Almeida et al. 2025 285.417 -0.454 – – – –
Hunt & Reffert 2024 285.417 -0.457 0.252 -1.145 -1.962 44.696
Cavallo et al. 2024 285.426 -0.44 0.247 – – –
Hunt & Reffert 2023 285.417 -0.457 0.252 -1.145 -1.962 44.696
Almeida et al. 2023 285.419 -0.452 – – – –
Angelo et al. 2023 285.413 -0.45 – -1.13 -1.94 –
Just et al. 2023 285.398 -0.462 – – – –
Jadhav & Subramaniam 2021 285.419 -0.454 – – – –
Jaehnig et al. 2021 285.42 -0.454 0.275 -1.213 -1.864 –
Netopil et al. 2022 285.417 -0.457 – – – 45.92
Rain et al. 2021 285.419 -0.454 0.254 -1.204 -1.853 –
Dias et al. 2021 285.417 -0.454 0.255 -1.191 -1.85 49.891
Cantat-Gaudin et al. 2020 285.419 -0.454 0.254 -1.204 -1.853 –
SΓ‘nchez et al. 2020 285.417 -0.456 – -1.327 -1.706 –
Cantat-Gaudin & Anders 2020 285.419 -0.454 0.254 -1.204 -1.853 –
Soubiran et al. 2018 285.419 -0.454 – – – 50.01
Bica et al. 2019 285.412 -0.456 – – – –
Cantat-Gaudin et al. 2018 285.419 -0.454 0.254 -1.204 -1.853 –
Dias et al. 2018 – – – -0.58 -3.29 –
Loktin & Popova 2017 285.42 -0.456 – 2.724 -8.142 13.0
Sampedro et al. 2017 285.417 -0.456 – 1.52 -1.08 –
Kharchenko et al. 2016 285.398 -0.462 – – – –
Netopil et al. 2016 285.405 -0.46 – – – –
Dias et al. 2014 285.417 -0.456 – 1.46 -0.7 –
Kharchenko et al. 2013 285.405 -0.46 – -0.99 -8.59 13.0
Gozha et al. 2012 285.417 -0.456 – – – –
Bukowiecki et al. 2011 285.404 0.449 – – – –
Ahumada & Lapasset 2007 285.4 -0.517 – – – –
van den Bergh 2006 285.4 -0.517 – – – –
Dias et al. 2002 285.417 -0.456 – 1.46 -0.7 48.1
Lynga 1987 285.416 -0.515 – – – –

πŸ’‘ 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– 3.425 3.15 2.17 1000 -0.070 2004 0.79 1
Hu & Soubiran 2025 – – – – -0.070(5) – – –
Almeida et al. 2025 3.69 3.04 – 769 – 1262 – –
Hunt & Reffert 2024 3.45 3.88 2.17 225 – 4001(1) – –
Cavallo et al. 2024 2.78 3.34 – 1096 -0.070 – – –
Hunt & Reffert 2023 3.45 3.88 2.17 225 – – – –
Almeida et al. 2023 3.10 3.15 – 791 0.139 1972(1) 0.79 –
Angelo et al. 2023 2.14 3.41 – 1259 -0.220 9(1) – –
Just et al. 2023 – – – 1000 – 2037 – –
Spina et al. 2022 – – – – 0.234 – – –
Jadhav & Subramaniam 2021 3.31 2.75 – 1148 – 2722 – 1(1)
Jaehnig et al. 2021 3.68(1) – – – – – – –
Netopil et al. 2022 3.02(1) – – 891 0.170(1) – – –
Rain et al. 2021 3.53 3.15 – 1000 – – – 1
Dias et al. 2021 3.69 3.04 – 769 0.215 – – –
Cantat-Gaudin et al. 2020 3.31 2.75 – 1148 – – – –
Kounkel et al. 2020 3.06 3.14 – 933 – – – –
Cantat-Gaudin & Anders 2020 3.53 – – – – – – –
Soubiran et al. 2018 3.53 – – – – – – –
Cantat-Gaudin et al. 2018 3.53 – – – – – – –
Loktin & Popova 2017 4.73 2.83 – 589 – – – –
Kharchenko et al. 2016 3.40 3.35 – 1000 – – – –
Netopil et al. 2016 5.73 – – 950 0.190(2) – – –
Kharchenko et al. 2013 3.40 3.35 – 1000 -0.150 – – –
Gozha et al. 2012 3.00 – – 1000 -0.150 – – –
Bukowiecki et al. 2011 3.60(1) 2.84 – 891 – – – –
Ahumada & Lapasset 2007 – 3.15 – 1000 – – – 19
van den Bergh 2006 3.00 3.15 – 1000 – – – –
Dias et al. 2002 3.00 3.15 – 1000 -0.150 – – –

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

Visualization
ℹ️
Berkeley 81 UCC
Berkeley 81 HUNT23
Berkeley 81 CANTAT20
Galactocentric position diagram