NGC 6791

(Berkeley 46; MWSC 3088; OCL 142; FSR 0186; FoF 639)

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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) 4657
Stellar density (N50/rad) 145.7 [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 6791 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, very old 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.

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: 0.86 (50th percentile).

Rain et al. (2021)
The red limit of the straggler area is BP-RP=1.20.

Ahumada & Lapasset (2007)
The red limit of the straggler area is (B-V)=0.8. According to (1965ApJ...142..655K), stars 96, 63, and 106 are probable cluster members. Stars 63 and 106 are cited as blue stragglers in (1988PASP..100..338G). In (1965ApJ...142..655K) attention is drawn to several `red stragglers' that are probable cluster members. The CCD study (1990MNRAS.243..492K) mentions the existence of a possible FK Comae star. Spectra from (1965ApJ...142..655K): star 39, G0V; star 45, F2IV; star 102, F2IV; star 67, G2V; star 129, F9V; star 63, G0V. Star 123 = V6 (1993MNRAS.265...34K) is an EW variable (1993MNRAS.265...34K); the authors also discover two EW variables (V1 and V7) that they mark as stragglers: both stars have mean (B-V) colours redder than our limit of 0.8.

Data
πŸ” Search references for NGC 6791 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 290.22 37.777 0.216 -0.425 -2.28 -47.275
Bijavara Seshashayana et al. 2025 290.262 37.754 – – – –
Otto et al. 2026 290.22 37.774 – -0.42 -2.27 -47.0
Li et al. 2025 290.221 37.778 0.192 -0.421 -2.269 –
Guerco et al. 2025 290.0 37.8 0.21 -0.39 -2.25 -47.2
Hu & Soubiran 2025 290.221 37.777 – – – –
Carrasco-Varela et al. 2025 290.375 37.778 – – – –
Almeida et al. 2025 290.224 37.776 – – – –
Zhang et al. 2024 290.22 37.774 – – – –
Hunt & Reffert 2024 290.22 37.774 0.215 -0.421 -2.277 -49.793
Cavallo et al. 2024 290.221 37.777 0.211 – – –
Hunt & Reffert 2023 290.22 37.774 0.215 -0.421 -2.277 -49.793
Angelo et al. 2023 290.217 37.78 – -0.42 -2.28 –
Cordoni et al. 2023 290.224 37.776 0.189 -0.427 -2.269 –
Just et al. 2023 290.216 37.778 – – – –
Jadhav & Subramaniam 2021 290.221 37.778 – – – –
Jaehnig et al. 2021 290.219 37.778 0.216 -0.422 -2.267 –
Rain et al. 2021 290.221 37.778 0.192 -0.421 -2.269 –
Dias et al. 2021 290.224 37.776 0.189 -0.427 -2.269 -47.268
Spina et al. 2021 290.221 37.778 0.188 -0.42 -2.274 –
Cantat-Gaudin et al. 2020 290.221 37.778 0.192 -0.421 -2.269 –
SΓ‘nchez et al. 2020 290.221 37.772 – -0.412 -2.225 –
Donor et al. 2020 290.22 37.78 – -0.44 -2.25 -46.9
Zhong et al. 2020 290.221 37.778 – -0.421 -2.269 -52.756
Cantat-Gaudin & Anders 2020 290.221 37.778 0.192 -0.421 -2.269 –
Liu & Pang 2019 290.226 37.779 0.266 -0.452 -2.275 –
Bossini et al. 2019 290.221 37.778 – – – –
Soubiran et al. 2018 290.221 37.778 – – – -45.85
Bica et al. 2019 290.221 37.763 – – – –
Cantat-Gaudin et al. 2018 290.221 37.778 0.192 -0.421 -2.269 –
Loktin & Popova 2017 290.22 37.772 – -1.217 -5.578 -52.3
Kharchenko et al. 2016 290.216 37.778 – – – –
Dias et al. 2014 290.221 37.772 – -0.83 -4.91 –
Kharchenko et al. 2013 290.22 37.78 – -0.31 -4.1 -52.3
Gozha et al. 2012 290.221 37.772 – – – –
Bukowiecki et al. 2011 290.225 37.774 – – – –
Kharchenko et al. 2007 290.22 37.77 – 0.08 – –
Ahumada & Lapasset 2007 290.225 37.767 – – – –
van den Bergh 2006 290.221 37.772 – – – –
Chen et al. 2003 290.231 37.791 – -3.17 -7.74 -57.0
Dias et al. 2002 290.221 37.772 – -0.83 -4.91 -47.4
Lynga 1987 290.185 37.842 – – – -68.0
Sulentic et al. 1973 290.194 37.848 – – – –

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– 4.48 0.41 0.36 6310 0.324 14253 0.25 35
Bijavara Seshashayana et al. 2025 – 0.70 – 8310 0.280(14) – – –
Otto et al. 2026 – – – 6310 0.300(15) – – –
Li et al. 2025 4.24 0.46 – 8138 0.327 – – –
Guerco et al. 2025 – – – 6310 0.330 – – –
Hu & Soubiran 2025 – – – – -0.040(5) – – –
Carrasco-Varela et al. 2025 4.45 0.39 – 7228 0.500 – – 35(1)
Almeida et al. 2025 4.45 0.31 – 7228 – 24429 – –
Zhang et al. 2024 – – – – 0.233(1) – – –
Hunt & Reffert 2024 – – – – – 19407(1) – –
Cavallo et al. 2024 3.44 0.98 – 9550 -0.400 – – –
Hunt & Reffert 2023 4.22 0.65 0.36 3802 – – – –
Angelo et al. 2023 4.15 0.41 – 7943 0.410 86(1) – –
Cordoni et al. 2023 4.45 0.31 – 7228 0.399 5037 0.25 35(1)
Just et al. 2023 – – – 4416 – 9099 – –
Spina et al. 2022 – – – – 0.350 – – –
Jadhav & Subramaniam 2021 4.23 0.70 – 6310 – 54394 – 24(1)
Jaehnig et al. 2021 4.51(1) – – – – – – –
Rain et al. 2021 4.53 0.50 – 8318 – – – 48
Dias et al. 2021 4.45 0.31 – 7228 0.399 – – –
Spina et al. 2021 4.41 – – 6310 0.332(20) – – –
Cantat-Gaudin et al. 2020 4.23 0.70 – 6310 – – – –
Kounkel et al. 2020 4.06 0.74 – 2399 – – – –
Donor et al. 2020 – – – – 0.350 – – –
Zhong et al. 2020 4.53(1) 0.31 – 9927 0.249 – – –
Cantat-Gaudin & Anders 2020 4.53 – – – – – – –
Liu & Pang 2019 – – – 1950 0.250 – – –
Bossini et al. 2019 4.14 0.30 – 8453 0.400 – – –
Soubiran et al. 2018 4.53 – – – – – – –
Cantat-Gaudin et al. 2018 4.53 – – – – – – –
Loktin & Popova 2017 5.47 0.41 – 4560 – – – –
Kharchenko et al. 2016 4.93 0.37 – 4416 – – – –
Kharchenko et al. 2013 4.93 0.37 – 4416 0.320 – – –
Gozha et al. 2012 5.85 – – 4395 0.320 – – –
Bukowiecki et al. 2011 4.06(1) 0.66 – 3548 – – – –
Ahumada & Lapasset 2007 – 0.38 – 4365 – – – 75
van den Bergh 2006 5.85 0.38 – 4365 – – – –
Chen et al. 2003 5.85 0.37 – 4390 0.150(1) – – –
Dias et al. 2002 5.04 0.50 – 8318 0.420 – – –
Lynga 1987 5.20 0.66 – 7079 0.040 – – –

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

Visualization
ℹ️
NGC 6791 UCC
NGC 6791 HUNT23
NGC 6791 CANTAT20
Galactocentric position diagram