NGC 6871

(Collinder 413; MWSC 3253; OCL 148; FoF 493)

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0.96 UTI
0.81
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
Nm (P>50%) 273
Core radius and density 1.2 [pc], 6.8 [pc-2]
C3 classification AA
  • CN 0.81 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
NGC 6871 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 moderate extinction. It is catalogued as a massive, near-solar metallicity, very young cluster (see Parameters). It is very well-studied in the literature.

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

Note: This object shares a very small percentage of members with a later reported entry. See table with shared members information.

Palma et al. (2025)
Classified as optical pair P553, along with PHOC_33.

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).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.2301, e_all=0.0894.

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg14' along with Biurakan 2, FSR 0198 and Teutsch 8.

Ahumada & Lapasset (2007)
Only the photoelectric data of (1961PUSNO..17..343H) were examined. Star 1 = HD 190918 = V1617 Cygni is a WR, double star of components near the cluster turnoff (1974A&AS...15..181C). Star 4 = HD 190864 (O7IIIf) is cited as a blue straggler in (1982A&A...109...37M).

Data
🔍 Search references for NGC 6871 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 301.511 35.764 0.515 -3.108 -6.458 0.538
Almeida et al. 2025 301.586 35.77 – – – –
Zhang et al. 2024 301.49 35.776 – – – –
Hunt & Reffert 2024 301.49 35.776 0.513 -3.092 -6.446 -0.99
Celli et al. 2024 301.548 35.765 – – – –
Cavallo et al. 2024 301.593 35.753 0.514 – – –
Hunt & Reffert 2023 301.49 35.776 0.513 -3.092 -6.446 -0.99
Just et al. 2023 301.494 35.767 – – – –
Jaehnig et al. 2021 301.518 35.769 0.544 -3.121 -6.426 –
Rain et al. 2021 301.548 35.765 0.514 -3.129 -6.437 –
Dias et al. 2021 301.586 35.77 0.516 -3.12 -6.444 –
Cantat-Gaudin et al. 2020 301.548 35.765 0.514 -3.129 -6.437 –
Zhong et al. 2020 301.548 35.765 – -3.129 -6.437 6.177
Cantat-Gaudin & Anders 2020 301.548 35.765 0.514 -3.129 -6.437 –
Liu & Pang 2019 301.488 35.791 0.522 -3.152 -6.444 –
Soubiran et al. 2018 301.548 35.765 – – – 4.38
Bica et al. 2019 301.497 35.77 – – – –
Cantat-Gaudin et al. 2018 301.548 35.765 0.514 -3.129 -6.437 –
Dib et al. 2018 301.5 35.77 – – – –
Loktin & Popova 2017 301.5 35.777 – -2.676 -5.114 -10.5
Sampedro et al. 2017 301.496 35.777 – -3.6 -4.61 –
Joshi et al. 2016 301.5 35.77 – – – –
Kharchenko et al. 2016 301.494 35.767 – – – –
Dias et al. 2014 301.496 35.777 – -3.26 -5.15 –
Kharchenko et al. 2013 301.5 35.77 – -3.39 -6.82 -10.5
Gozha et al. 2012 301.496 35.777 – – – –
Piskunov et al. 2008 301.486 35.776 – – – –
Kharchenko et al. 2007 301.5 35.78 – 0.23 – -10.54
Piskunov et al. 2007 301.486 35.776 – – – –
Ahumada & Lapasset 2007 301.5 35.783 – – – –
van den Bergh 2006 301.5 35.783 – – – –
Kharchenko et al. 2005 301.5 35.78 – -3.65 -7.19 -10.54
Kharchenko et al. 2003 301.47 35.77 – -3.68 -7.82 –
Chen et al. 2003 301.418 35.764 – -3.23 -6.93 -7.7
Dias et al. 2002 301.496 35.777 – -3.26 -5.15 -108.01
Dambis 1999 301.496 35.777 – – – –
Lynga 1987 301.466 35.787 – – – -15.0
Sulentic et al. 1973 301.46 35.773 – – – –

💡 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– 1.765 1.39 1.67 10 0.000 1148 – 1
Almeida et al. 2025 1.74 1.44 – 12 – 2423 – –
Zhang et al. 2024 – – – – -0.050(1) – – –
Hunt & Reffert 2024 1.83 1.33 1.67 8 – 1601(1) – –
Celli et al. 2024 – – – 6 – 2822 – –
Cavallo et al. 2024 1.81 1.43 – 8 0.000 – – –
Hunt & Reffert 2023 1.83 1.33 1.67 8 – – – –
Just et al. 2023 – – – 10 – 863 – –
Jaehnig et al. 2021 1.82(1) – – – – – – –
Rain et al. 2021 1.84 1.39 – 9 – – – 0
Dias et al. 2021 1.74 1.44 – 12 0.104 – – –
Cantat-Gaudin et al. 2020 1.72 1.19 – 5 – – – –
Kounkel et al. 2020 1.84 1.38 – 17 – – – –
Zhong et al. 2020 1.84(1) 1.31 – 6990 0.000 – – –
Cantat-Gaudin & Anders 2020 1.84 – – – – – – –
Liu & Pang 2019 – – – 7 0.250 – – –
Soubiran et al. 2018 1.84 – – – – – – –
Cantat-Gaudin et al. 2018 1.84 – – – – – – –
Dib et al. 2018 1.79 – – 10 – – – –
Loktin & Popova 2017 1.62 1.39 – 9 – – – –
Joshi et al. 2016 1.79 1.31 – 10 – 1148 – –
Kharchenko et al. 2016 1.79 1.31 – 10 – – – –
Kharchenko et al. 2013 1.79 1.31 – 10 – – – –
Gozha et al. 2012 1.57 – – 9 -0.330 1148 – –
Paunzen et al. 2010 – – – – -0.330 – – –
Piskunov et al. 2008 1.57 1.39 – 10 – 499(1) – –
Piskunov et al. 2007 1.57 1.39 – 10 – 116 – –
Ahumada & Lapasset 2007 – 1.39 – 9 – – – 2
van den Bergh 2006 1.57 1.39 – 9 – – – –
Kharchenko et al. 2005 1.57 1.39 – 10 – – – –
Kharchenko et al. 2003 1.57 1.39 – – – – – –
Chen et al. 2003 1.57 – – 0 – – – –
Dias et al. 2002 1.57 1.40 – 9 – – – –
Dambis 1999 1.51 1.41 – 10 – – – –
Lynga 1987 1.65 1.20 – 10 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
OC 0102 6.6 301.71 35.64 0.53 -3.1 -6.61 -17.95 0.06

💡 Note: The % column shows the percentage of members that NGC 6871 shares with each listed object.

Visualization
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NGC 6871 UCC
NGC 6871 HUNT23
NGC 6871 CANTAT20
Galactocentric position diagram