NGC 6494

(Melotte 184; Collinder 356; MWSC 2757; M 23; OCL 30; ESO 589 22; FoF 2336)

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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) 822
Stellar density (N50/rad) 65.8 [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 6494 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is very well-studied in the literature.

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

Cavallo et al. (2024)
Gold sample.

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

Richer et al. (2021)
The expected number of WDs is 35.0, 0 WD candidates found, and 0 WD candidates found in the wide search.

Ahumada & Lapasset (2007)
Only the photoelectric data of (1961PUSNO..17..343H) were examined. Stars 1= HD 163245 and 12 have spectra A4V (1969AJ.....74..375C) and A0V (1965ApJS...12..215H). The proper motion study (1980A&A....88..102S) assigns these stars the membership probabil- ities 88% and 98%.

Data
🔍 Search references for NGC 6494 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 269.24 -18.99 1.366 0.31 -1.831 -9.238
Nizovkina et al. 2025 269.232 -18.999 – – – –
Li et al. 2025 269.237 -18.987 1.354 0.284 -1.809 –
Wei et al. 2025 269.23 -18.988 1.366 0.311 -1.837 –
Almeida et al. 2025 269.241 -18.969 – – – –
Alfonso et al. 2024 269.23 -18.987 1.329 0.308 -1.843 –
Hunt & Reffert 2024 269.232 -18.999 1.368 0.314 -1.824 -10.867
Cavallo et al. 2024 269.246 -18.96 1.367 – – –
Hunt & Reffert 2023 269.232 -18.999 1.368 0.314 -1.824 -10.867
Cordoni et al. 2023 269.241 -18.969 1.359 0.284 -1.798 –
Just et al. 2023 269.219 -19.001 – – – –
He et al. 2022 269.233 -18.976 1.369 0.305 -1.844 –
Tarricq et al. 2022 269.256 -19.027 1.367 0.299 -1.837 –
Jadhav & Subramaniam 2021 269.237 -18.987 – – – –
Jaehnig et al. 2021 269.244 -18.996 1.387 0.281 -1.803 –
Rain et al. 2021 269.237 -18.987 1.354 0.284 -1.809 –
Richer et al. 2021 269.103 -18.825 1.361 0.259 -1.802 –
Dias et al. 2021 269.241 -18.969 1.359 0.284 -1.798 -7.639
Spina et al. 2021 269.237 -18.986 1.355 0.278 -1.799 –
Cantat-Gaudin et al. 2020 269.237 -18.987 1.354 0.284 -1.809 –
Cantat-Gaudin & Anders 2020 269.237 -18.987 1.354 0.284 -1.809 –
Liu & Pang 2019 269.245 -18.962 1.367 0.293 -1.786 –
Bossini et al. 2019 269.237 -18.987 – – – –
Soubiran et al. 2018 269.237 -18.987 – – – -8.37
Bica et al. 2019 269.24 -18.998 – – – –
Cantat-Gaudin et al. 2018 269.237 -18.987 1.354 0.284 -1.809 –
Loktin & Popova 2017 269.265 -18.986 – 0.72 -0.94 -8.6
Kharchenko et al. 2016 269.219 -19.001 – – – –
Dias et al. 2014 269.267 -18.985 – 0.72 -0.94 –
Kharchenko et al. 2013 269.227 -19.0 – 1.93 -1.4 -8.6
Gozha et al. 2012 269.267 -18.985 – – – –
Piskunov et al. 2008 269.254 -18.994 – – – –
Kharchenko et al. 2007 269.26 -18.99 – 0.58 – –
Piskunov et al. 2007 269.254 -18.994 – – – –
Ahumada & Lapasset 2007 269.275 -18.983 – – – –
van den Bergh 2006 269.25 -18.983 – – – –
Kharchenko et al. 2005 269.26 -18.99 – 0.65 -1.14 –
Kharchenko et al. 2003 269.25 -19.02 – 0.81 -1.18 –
Chen et al. 2003 269.239 -18.968 – -1.3 -0.67 -8.6
Dias et al. 2002 269.267 -18.985 – 0.72 -0.94 -8.18
Lynga 1987 269.229 -19.015 – – – –
Sulentic et al. 1973 269.244 -19.019 – – – –

💡 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– 0.69 1.14 0.93 331 0.090 2118 0.505 0
Nizovkina et al. 2025 0.58(4) 1.31(4) – 346(4) -0.257(4) – – –
Li et al. 2025 0.72 1.07 – 464 0.154 – – –
Wei et al. 2025 1.24 1.41 – 363 0.250 2760 0.62 –
Almeida et al. 2025 0.69 1.28 – 331 – 1875 – –
Alfonso et al. 2024 0.74 0.91 – 502 0.096 – – –
Hunt & Reffert 2024 – – – – – 4068(1) – –
Cavallo et al. 2024 0.68 1.63 – 257 -0.230 – – –
Hunt & Reffert 2023 0.69 1.13 0.93 226 – – – –
Cordoni et al. 2023 0.69 1.28 – 331 0.095 2118 0.39 0(1)
Just et al. 2023 – – – 327 – 3013 – –
He et al. 2022 – 1.45 – 282 – – – –
Tarricq et al. 2022 0.73 – – 407 – – – –
Jadhav & Subramaniam 2021 0.74 0.91 – 380 – 2715 – 0(1)
Jaehnig et al. 2021 0.72(1) – – – – – – –
Rain et al. 2021 0.72 0.85 – 479 – – – 0
Richer et al. 2021 – 1.15 – 380 – – – –
Dias et al. 2021 0.69 1.28 – 331 0.095 – – –
Spina et al. 2021 0.74 – – 380 – – – –
Cantat-Gaudin et al. 2020 0.74 0.91 – 380 – – – –
Kounkel et al. 2020 0.69 1.30 – 251 – – – –
Cantat-Gaudin & Anders 2020 0.72 – – – – – – –
Liu & Pang 2019 – – – 282 0.250 – – –
Bossini et al. 2019 0.66 0.85 – 479 -0.040 – – –
Soubiran et al. 2018 0.72 – – – – – – –
Cantat-Gaudin et al. 2018 0.72 – – – – – – –
Loktin & Popova 2017 0.63 1.12 – 300 – – – –
Kharchenko et al. 2016 0.65 1.38 – 327 – – – –
Kharchenko et al. 2013 0.65 1.38 – 327 0.090 – – –
Gozha et al. 2012 0.63 – – 300 0.040 562 – –
Piskunov et al. 2008 0.63 1.14 – 331 – 1698(1) – –
Piskunov et al. 2007 0.63 1.14 – 331 – 589 – –
Ahumada & Lapasset 2007 – 1.14 – 302 – – – 2
van den Bergh 2006 0.63 1.14 – 302 – – – –
Kharchenko et al. 2005 0.63 1.14 – 331 – – – –
Kharchenko et al. 2003 0.63 1.10 – – – – – –
Chen et al. 2003 0.63 1.12 – 290 0.090(1) – – –
Dias et al. 2002 0.63 1.12 – 300 0.040 – – –
Lynga 1987 0.66 0.82 – 224 – – – –

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

Visualization
ℹī¸
NGC 6494 UCC
NGC 6494 HUNT23
NGC 6494 CANTAT20
Galactocentric position diagram