NGC 6866

(MWSC 3239; FoF 2040; LISC 3072)

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0.97 UTI
0.84
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 343
Stellar density (N50/rad) 21.3 [N/pc2]
C3 classification AA
  • CN 0.84 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 6866 is a rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the 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.

Malhotra et al. (2026)
Lowest/Highest stellar mass in the catalogue with a mass-ratio estimate: 0.61/2.06 Msun

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

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).

Ahumada & Lapasset (2007)
Only the photoelectric data of (1961PUSNO..17..343H) were examined.

Data
πŸ” Search references for NGC 6866 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 300.98 44.171 0.688 -1.369 -5.764 13.807
Malhotra et al. 2026 300.99 44.173 – – – –
Otto et al. 2026 300.982 44.166 – -1.36 -5.74 12.6
Li et al. 2025 300.983 44.158 0.686 -1.365 -5.743 –
Hu & Soubiran 2025 301.002 44.186 – – – –
Almeida et al. 2025 300.983 44.16 – – – –
Zhang et al. 2024 300.982 44.166 – – – –
Hunt & Reffert 2024 300.982 44.166 0.692 -1.372 -5.764 15.177
Cavallo et al. 2024 301.002 44.186 0.69 – – –
Hunt & Reffert 2023 300.982 44.166 0.692 -1.372 -5.764 15.177
Almeida et al. 2023 300.971 44.16 – – – –
Angelo et al. 2023 300.975 44.15 – -1.38 -5.77 –
Just et al. 2023 300.982 44.158 – – – –
Tarricq et al. 2022 300.946 44.171 0.687 -1.375 -5.771 –
Jadhav & Subramaniam 2021 300.983 44.158 – – – –
Jaehnig et al. 2021 300.986 44.164 0.716 -1.379 -5.737 –
Netopil et al. 2022 300.983 44.158 – – – 12.44
Rain et al. 2021 300.983 44.158 0.686 -1.365 -5.743 –
Dias et al. 2021 300.983 44.16 0.686 -1.358 -5.733 13.519
Spina et al. 2021 300.983 44.171 0.685 -1.366 -5.733 –
Cantat-Gaudin et al. 2020 300.983 44.158 0.686 -1.365 -5.743 –
SΓ‘nchez et al. 2020 300.979 44.158 – -1.397 -5.57 –
Donor et al. 2020 300.987 44.16 – -1.18 -5.91 14.2
Zhong et al. 2020 300.983 44.158 – -1.365 -5.743 6.858
Cantat-Gaudin & Anders 2020 300.983 44.158 0.686 -1.365 -5.743 –
Liu & Pang 2019 301.0 44.188 0.683 -1.411 -5.748 –
Bossini et al. 2019 300.983 44.158 – – – –
Soubiran et al. 2018 300.983 44.158 – – – 12.83
Cantat-Gaudin et al. 2018 300.983 44.158 0.686 -1.365 -5.743 –
Dias et al. 2018 – – – -2.42 -5.28 –
Dib et al. 2018 300.987 44.16 – – – –
Loktin & Popova 2017 300.975 44.158 – -2.022 -3.143 13.7
Sampedro et al. 2017 300.979 44.158 -1.23 -2.47 – –
Joshi et al. 2016 300.987 44.16 – – – –
Kharchenko et al. 2016 300.982 44.158 – – – –
Dias et al. 2014 300.979 44.158 – -1.39 -3.07 –
Kharchenko et al. 2013 300.987 44.16 – -2.75 -4.8 13.7
Gozha et al. 2012 300.979 44.158 – – – –
Bukowiecki et al. 2011 301.05 44.155 – – – –
Piskunov et al. 2008 300.978 44.158 – – – –
Ahumada & Lapasset 2007 300.975 44.167 – – – –
van den Bergh 2006 300.979 44.158 – – – –
Kharchenko et al. 2005 300.97 44.16 – -3.48 -5.8 –
Kharchenko et al. 2003 300.94 43.99 – -4.06 -8.3 –
Dias et al. 2002 300.979 44.158 – -1.39 -3.07 13.68
Lynga 1987 300.928 44.157 – – – –
Sulentic et al. 1973 300.93 43.988 – – – –

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– 1.39 0.51 0.76 646 0.010 284 0.42 1
Malhotra et al. 2026 1.44 0.45 – 679 0.000 – – –
Otto et al. 2026 – – – 646 0.020(15) – – –
Li et al. 2025 1.36 0.39 – 848 0.039 – – –
Hu & Soubiran 2025 – – – – -0.120(5) – – –
Almeida et al. 2025 1.35 0.50 – 726 – 284 – –
Zhang et al. 2024 – – – – -0.037(1) – – –
Hunt & Reffert 2024 – – – – – 1125(1) – –
Cavallo et al. 2024 1.49 0.54 – 724 0.340 – – –
Hunt & Reffert 2023 1.39 0.31 0.76 630 – – – –
Almeida et al. 2023 1.38 0.51 – 780 0.063 449(1) 0.42 –
Angelo et al. 2023 1.23 0.50 – 794 0.050 3(1) – –
Deng & Li 2023 1.10 0.57 – 900 -0.067 – – –
Just et al. 2023 – – – 437 – 94 – –
Spina et al. 2022 – – – – 0.010 – – –
Tarricq et al. 2022 1.36 – – 646 – – – –
Jadhav & Subramaniam 2021 1.41 0.48 – 646 – 360 – 1(1)
Jaehnig et al. 2021 1.40(1) – – – – – – –
Netopil et al. 2022 1.34(1) – – 776 0.010(1) – – –
Rain et al. 2021 1.40 0.22 – 813 – – – 1
Dias et al. 2021 1.35 0.50 – 726 0.047 – – –
Spina et al. 2021 1.46 – – 646 0.002(20) – – –
Cantat-Gaudin et al. 2020 1.41 0.48 – 646 – – – –
Kounkel et al. 2020 1.35 0.78 – 417 – – – –
Donor et al. 2020 – – – – 0.010 – – –
Zhong et al. 2020 1.40(1) 0.40 – 8890 -0.045 – – –
Cantat-Gaudin & Anders 2020 1.40 – – – – – – –
Liu & Pang 2019 – – – 562 0.250 – – –
Bossini et al. 2019 1.34 0.40 – 776 -0.013 – – –
Soubiran et al. 2018 1.40 – – – – – – –
Cantat-Gaudin et al. 2018 1.40 – – – – – – –
Dib et al. 2018 1.33 – – 437 – – – –
Loktin & Popova 2017 1.47 0.53 – 389 – – – –
Joshi et al. 2016 1.33 0.85 – 437 – 59 – –
Kharchenko et al. 2016 1.33 0.85 – 437 – – – –
Kharchenko et al. 2013 1.33 0.85 – 437 – – – –
Bukowiecki et al. 2012 – – – – – 541 – –
Gozha et al. 2012 1.45 – – 377 – 59 – –
Bukowiecki et al. 2011 1.32(1) 0.88 – 355 – – – –
Piskunov et al. 2008 1.45 0.54 – 479 – – – –
Ahumada & Lapasset 2007 – 0.54 – 380 – – – 0
van den Bergh 2006 1.45 0.54 – 380 – – – –
Kharchenko et al. 2005 1.45 0.54 – 479 – – – –
Kharchenko et al. 2003 1.45 0.54 – – – – – –
Dias et al. 2002 1.19 0.23 – 813 -0.013 – – –
Lynga 1987 1.20 0.41 – 229 – – – –

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

Visualization
ℹ️
NGC 6866 UCC
NGC 6866 HUNT23
NGC 6866 CANTAT20
Galactocentric position diagram