NGC 2506

(Melotte 80; Collinder 170; MWSC 1406; OCL 593; FSR 1230; FoF 634)

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1.0 UTI
1.0
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 2044
Stellar density (N50/rad) 73.1 [N/pc2]
C3 classification AA
  • CN 1.0 Very 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
NGC 2506 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, well above the mid-plane, affected by low extinction. It is catalogued as an extremely massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the absorption, 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: good fit. Gold sample.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Rain et al. (2024)
Except for one BSS near the ZAMS, all candidates follow binary evolution tracks over a broad luminosity range. The BSS population is small, and no YSSs are detected.

Ahumada & Lapasset (2007)
The following membership probabilities are from (1981ApJ...243..827C): star 441, 42%, star 447, 94%, star 462, 71%, star 467, 91%, star 510, 88%, star 571, 42%, star 691, 88%, star 769, 91%. Star 589 (1997MNRAS.291..763M) = 3129 (WEBDA), which also appears as a straggler, is a non-member according to (1981ApJ...243..827C).

Data
πŸ” Search references for NGC 2506 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 120.009 -10.774 0.281 -2.557 3.966 83.937
Li et al. 2025 120.01 -10.773 0.292 -2.571 3.912 –
Hu & Soubiran 2025 120.011 -10.775 – – – –
Carrasco-Varela et al. 2025 120.225 -10.835 – – – –
Almeida et al. 2025 120.011 -10.775 – – – –
Hunt & Reffert 2024 120.002 -10.77 0.279 -2.561 3.965 82.351
Cavallo et al. 2024 120.011 -10.775 0.278 – – –
Rain et al. 2024 120.009 -10.774 0.282 -2.557 3.969 –
Hunt & Reffert 2023 120.002 -10.77 0.279 -2.561 3.965 82.351
Just et al. 2023 119.993 -10.757 – – – –
Jadhav & Subramaniam 2021 120.01 -10.773 – – – –
Jaehnig et al. 2021 120.008 -10.773 0.317 -2.568 3.917 –
Rain et al. 2021 120.01 -10.773 0.292 -2.571 3.912 –
Dias et al. 2021 120.011 -10.775 0.296 -2.569 3.911 83.049
Spina et al. 2021 120.009 -10.773 0.294 -2.571 3.914 –
Cantat-Gaudin et al. 2020 120.01 -10.773 0.292 -2.571 3.912 –
SΓ‘nchez et al. 2020 120.004 -10.77 – -2.644 3.91 –
Cantat-Gaudin & Anders 2020 120.01 -10.773 0.292 -2.571 3.912 –
Liu & Pang 2019 120.012 -10.775 0.317 -2.56 3.896 –
Soubiran et al. 2018 120.01 -10.773 – – – 84.9
Bica et al. 2019 120.012 -10.773 – – – –
Cantat-Gaudin et al. 2018 120.01 -10.773 0.292 -2.571 3.912 –
Loktin & Popova 2017 120.0 -10.769 – -1.152 1.61 87.0
Kharchenko et al. 2016 119.993 -10.757 – – – –
Dias et al. 2014 120.004 -10.77 – -1.87 1.96 –
Kharchenko et al. 2013 120.0 -10.76 – -1.62 2.14 87.0
Gozha et al. 2012 120.004 -10.77 – – – –
Bukowiecki et al. 2011 120.0 -10.774 – – – –
Piskunov et al. 2008 119.998 -10.769 – – – –
Kharchenko et al. 2007 120.0 -10.77 – 0.2 – –
Ahumada & Lapasset 2007 120.0 -10.767 – – – –
van den Bergh 2006 120.004 -10.77 – – – –
Kharchenko et al. 2005 120.0 -10.77 – -5.87 1.79 –
Chen et al. 2003 119.994 -10.783 – – – –
Dias et al. 2002 120.004 -10.77 – -1.87 1.96 83.25
Lynga 1987 119.986 -10.788 – – – –
Sulentic et al. 1973 120.022 -10.786 – – – –

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– 3.23 0.25 0.27 1622 -0.281 11701 0.2 12
Li et al. 2025 3.25 0.28 – 2031 -0.281 – – –
Hu & Soubiran 2025 – – – – -0.310(5) – – –
Carrasco-Varela et al. 2025 3.23 0.26 – 2099 -0.310 – – 8(1)
Almeida et al. 2025 3.23 0.26 – 2099 – 7718 – –
Hunt & Reffert 2024 – – – – – 11701(1) – –
Cavallo et al. 2024 2.51 0.56 – 2399 -0.680 – – –
Rain et al. 2024 3.22 0.09 – 2133 – 19934 0.20 –
Hunt & Reffert 2023 3.17 0.03 0.27 2410 – – – –
Just et al. 2023 – – – 1622 – 3296 – –
Jadhav & Subramaniam 2021 3.19 0.09 – 1660 – 12717 – 10(1)
Jaehnig et al. 2021 3.17(1) – – – – – – –
Rain et al. 2021 3.11 0.32 – 1000 – – – 14
Dias et al. 2021 3.23 0.26 – 2099 -0.247 – – –
Spina et al. 2021 3.32 – – 1660 – – – –
Cantat-Gaudin et al. 2020 3.19 0.09 – 1660 – – – –
Kounkel et al. 2020 3.35 0.18 – 1479 – – – –
Cantat-Gaudin & Anders 2020 3.11 – – – – – – –
Liu & Pang 2019 – – – 2630 0.000 – – –
Soubiran et al. 2018 3.11 – – – – – – –
Cantat-Gaudin et al. 2018 3.11 – – – – – – –
Loktin & Popova 2017 3.67 0.30 – 1102 – – – –
Kharchenko et al. 2016 3.53 0.13 – 1622 – – – –
Kharchenko et al. 2013 3.53 0.13 – 1622 -0.200 – – –
Bukowiecki et al. 2012 – – – – – 19303 – –
Gozha et al. 2012 3.46 – – 1109 -0.200 6918 – –
Bukowiecki et al. 2011 3.01(1) 0.00 – 1122 – – – –
Piskunov et al. 2008 3.46 0.25 – 1122 – – – –
Ahumada & Lapasset 2007 – 0.25 – 1122 – – – 15
van den Bergh 2006 3.46 0.25 – 1096 – – – –
Kharchenko et al. 2005 3.46 0.25 – 1122 – – – –
Chen et al. 2003 3.46 0.26 – 1100 -0.370(1) – – –
Dias et al. 2002 3.75 0.32 – 1000 -0.200 – – –
Lynga 1987 2.75 0.28 – 3388 -0.550 – – –

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

Visualization
ℹ️
NGC 2506 UCC
NGC 2506 HUNT23
NGC 2506 CANTAT20
Galactocentric position diagram