NGC 6705

(Melotte 213; Collinder 391; MWSC 3008; M 11; OCL 76; FSR 0082; FoF 155)

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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) 1899
Stellar density (N50/rad) 228.1 [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
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
NGC 6705 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate extinction. It is catalogued as a very massive, near-solar metallicity, intermediate-age 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.

Note: This object shares a very small percentage of members with 2 later reported entries. See table with shared members information.

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).

Ahumada & Lapasset (2007)
The colour-magnitude diagram in (1980AJ.....85..432S) was examined. It displays stars with p>=90% according to the proper motion study (1977A&AS...27..117M). Star 1095 is given in (1977A&AS...27..117M) a membership probability of 61%. Adopted cluster centre: star 1066 (ref. 277). The apparent diameter is from (1980AJ.....85..432S). References (1985ApJ...294L.103A) and (1982A&A...109...37M) cite star 1095 as a blue straggler; in (1985ApJ...294L.103A) this star is given a spectrum B3p.

Data
🔍 Search references for NGC 6705 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 282.768 -6.272 0.413 -1.547 -4.164 35.362
Otto et al. 2026 282.766 -6.275 – -1.57 -4.14 35.1
Li et al. 2025 282.766 -6.272 0.427 -1.568 -4.144 –
Guerco et al. 2025 283.0 -6.27 0.41 -1.49 -4.2 34.8
Almeida et al. 2025 282.765 -6.269 – – – –
Hunt & Reffert 2024 282.766 -6.275 0.411 -1.536 -4.166 35.65
Cavallo et al. 2024 282.768 -6.274 0.411 – – –
Hunt & Reffert 2023 282.766 -6.275 0.411 -1.536 -4.166 35.65
Cordoni et al. 2023 282.765 -6.269 0.436 -1.574 -4.149 –
Just et al. 2023 282.74 -6.282 – – – –
Jaehnig et al. 2021 282.763 -6.277 0.469 -1.581 -4.134 –
Rain et al. 2021 282.766 -6.272 0.427 -1.568 -4.144 –
Dias et al. 2021 282.765 -6.269 0.436 -1.574 -4.149 35.681
Spina et al. 2021 282.766 -6.27 0.434 -1.573 -4.144 –
Cantat-Gaudin et al. 2020 282.766 -6.272 0.427 -1.568 -4.144 –
Donor et al. 2020 282.747 -6.28 – -1.56 -4.17 35.4
Cantat-Gaudin & Anders 2020 282.766 -6.272 0.427 -1.568 -4.144 –
Liu & Pang 2019 282.772 -6.272 0.453 -1.582 -4.125 –
Soubiran et al. 2018 282.766 -6.272 – – – 36.01
Bica et al. 2019 282.762 -6.274 – – – –
Cantat-Gaudin et al. 2018 282.766 -6.272 0.427 -1.568 -4.144 –
Loktin & Popova 2017 282.765 -6.271 – -2.205 -6.536 32.5
Kharchenko et al. 2016 282.74 -6.282 – – – –
Dias et al. 2014 282.771 -6.27 – -1.23 1.31 –
Kharchenko et al. 2013 282.747 -6.28 – -4.92 -3.23 32.5
Gozha et al. 2012 282.771 -6.27 – – – –
Bukowiecki et al. 2011 282.771 -6.268 – – – –
Piskunov et al. 2008 282.762 -6.274 – – – –
Kharchenko et al. 2007 282.76 -6.27 – 0.19 – 29.49
Ahumada & Lapasset 2007 282.775 -6.267 – – – –
van den Bergh 2006 282.75 -6.267 – – – –
Kharchenko et al. 2005 282.76 -6.27 – -6.51 -0.48 29.49
Kharchenko et al. 2003 282.76 -6.27 – -5.81 -1.2 –
Chen et al. 2003 282.782 -6.278 – -4.63 -1.1 34.4
Dias et al. 2002 282.771 -6.27 – -1.23 1.31 35.08
Lynga 1987 282.767 -6.265 – – – 25.0
Sulentic et al. 1973 282.76 -6.27 – – – –

💡 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– 1.89 1.36 0.67 282 0.110 6167 0.63 1
Otto et al. 2026 – – – 309 0.110(15) – – –
Li et al. 2025 2.06 1.14 – 476 0.152 – – –
Guerco et al. 2025 – – – 310 0.110 – – –
Almeida et al. 2025 1.89 1.46 – 294 – 5738 – –
Hunt & Reffert 2024 – – – – – 13330(1) – –
Cavallo et al. 2024 1.85 1.67 – 251 -0.260 – – –
Hunt & Reffert 2023 2.24 1.31 0.67 132 – – – –
Cordoni et al. 2023 1.89 1.46 – 294 0.043 10292 0.63 0(1)
Just et al. 2023 – – – 320 – 2198 – –
Spina et al. 2022 – – – – 0.120 – – –
Jaehnig et al. 2021 2.19(1) – – – – – – –
Rain et al. 2021 2.19 1.32 – 251 – – – 2
Dias et al. 2021 1.89 1.46 – 294 0.043 – – –
Spina et al. 2021 2.34 – – 309 0.103(20) – – –
Cantat-Gaudin et al. 2020 2.21 1.20 – 309 – – – –
Kounkel et al. 2020 2.34 1.19 – 251 – – – –
Donor et al. 2020 – – – – 0.120 – – –
Cantat-Gaudin & Anders 2020 2.19 – – – – – – –
Liu & Pang 2019 – – – 576 0.250 – – –
Soubiran et al. 2018 2.19 – – – – – – –
Cantat-Gaudin et al. 2018 2.19 – – – – – – –
Loktin & Popova 2017 1.89 1.34 – 202 – – – –
Kharchenko et al. 2016 1.75 1.49 – 320 – – – –
Perren et al. 2015 1.45(1) 1.42(1) – 398(1) -0.100(1) – – –
Kharchenko et al. 2013 1.75 1.49 – 320 0.136 – – –
Bukowiecki et al. 2012 – – – – – 6596 – –
Gozha et al. 2012 1.88 – – 251 0.140 661 – –
Bukowiecki et al. 2011 1.87(1) 1.23 – 282 – – – –
Piskunov et al. 2008 1.88 1.36 – 117 – – – –
Ahumada & Lapasset 2007 – 1.36 – 200 – – – 1
van den Bergh 2006 1.88 1.36 – 200 – – – –
Kharchenko et al. 2005 1.88 1.36 – 117 – – – –
Kharchenko et al. 2003 1.88 1.36 – – – – – –
Chen et al. 2003 1.88 1.34 – 200 0.140(1) – – –
Dias et al. 2002 1.88 1.35 – 251 0.000 – – –
Lynga 1987 1.72 1.14 – 224 0.100 – – –

(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 0048 9.8 282.78 -6.27 0.45 -1.56 -4.12 34.65 0.0
OC 0049 1.3 282.77 -6.27 0.26 -1.54 -4.21 -15.54 0.01

💡 Note: The % column shows the percentage of members that NGC 6705 shares with each listed object.

Visualization
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NGC 6705 UCC
NGC 6705 HUNT23
NGC 6705 CANTAT20
Galactocentric position diagram