NGC 6475

(Melotte 183; Collinder 354; VDBH 254; MWSC 2739; M 7; OCL 1028; vdBergh-Hagen 254; ESO 394 09; FoF 2404; OCSN 240)

Click to load Aladin Lite
1.0 UTI
1.0
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 964
Stellar density (N50/rad) 117.0 [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 6475 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a very close distance, near 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 age parameter (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: 0.24/2.84 Msun

Yan et al. (2026)
Number of WDs: expected from single-star evolution N=21, with probability of formation through binary evolution >=0.5 N=9.

Palma et al. (2025)
Classified as optical pair P492, along with HSC_2871.

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

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 33.4, 0 WD candidates found, and 0 WD candidates found in the wide search.

Ahumada & Lapasset (2007)
Only the colour-magnitude diagram based on the photoelectric data of (1959BAN....14..265K) was examined. Adopted cluster centre: star 65 (1959BAN....14..265K). Star 26=HD 162374 is cited as a blue straggler in (1981ApJ...246..817E), where it is found to be similar to Theta Carinae. In (1985ApJ...294L.103A) and (1982A&A...109...37M) stars 26 and 56=HD 162586 are also cited as blue stragglers. In (1969ApJ...156..983A) these stars are given the spectra B6V and B8V. Membership probabilities based on proper motions (1969PASAu...1..207C): star 26, 53%; star 56, 57%. Probability based on radial velocities (1985A&AS...61...75G): star 56, 92%. This star is also a visual binary (delta=0.0 mag,rho=0.3") (1974ApJ...194..657H). The stragglers of this cluster were studied spectro- scopically by (2000A&A...356..517A).

Data
🔍 Search references for NGC 6475 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 268.471 -34.831 3.578 3.075 -5.397 -14.533
Yan et al. 2026 268.476 -34.828 3.583 3.08 -5.366 –
Malhotra et al. 2026 268.434 -34.827 – – – –
Nizovkina et al. 2025 268.476 -34.828 – – – –
Li et al. 2025 268.447 -34.841 3.572 3.099 -5.426 –
Wei et al. 2025 268.469 -34.841 3.579 3.07 -5.403 –
Almeida et al. 2025 268.397 -34.88 – – – –
Alfonso et al. 2024 268.477 -34.81 3.539 3.075 -5.389 –
Hunt & Reffert 2024 268.476 -34.828 3.583 3.08 -5.366 -14.55
Cavallo et al. 2024 268.483 -34.784 3.583 – – –
Hunt & Reffert 2023 268.476 -34.828 3.583 3.08 -5.366 -14.55
Almeida et al. 2023 268.421 -34.872 – – – –
Qin et al. 2023 268.45 -34.82 3.58 3.06 -5.38 -14.24
He et al. 2022 268.446 -34.793 3.584 3.033 -5.37 –
Tarricq et al. 2022 268.434 -34.879 3.591 3.067 -5.404 –
Jaehnig et al. 2021 268.466 -34.782 3.599 3.097 -5.316 –
Rain et al. 2021 268.447 -34.841 3.572 3.099 -5.426 –
Richer et al. 2021 268.538 -34.847 3.405 2.963 -5.268 –
Dias et al. 2021 268.397 -34.88 3.567 3.105 -5.399 -14.591
Spina et al. 2021 268.446 -34.831 3.568 3.104 -5.371 –
Cantat-Gaudin et al. 2020 268.447 -34.841 3.572 3.099 -5.426 –
Cantat-Gaudin & Anders 2020 268.447 -34.841 3.572 3.099 -5.426 –
Liu & Pang 2019 268.475 -34.804 3.593 3.105 -5.313 –
Bossini et al. 2019 268.447 -34.841 – – – –
Soubiran et al. 2018 268.447 -34.841 – – – -14.84
Bica et al. 2019 268.466 -34.807 – – – –
Cantat-Gaudin et al. 2018 268.447 -34.841 3.572 3.099 -5.426 –
Yen et al. 2018 268.373 -34.656 3.45 3.15 -5.51 –
Loktin & Popova 2017 268.455 -34.794 – 1.67 -3.6 -12.6
Kharchenko et al. 2016 268.431 -34.781 – – – –
Dias et al. 2014 268.462 -34.793 – -3.19 -4.08 –
Kharchenko et al. 2013 268.44 -34.78 – 2.58 -4.98 -12.6
Gozha et al. 2012 268.462 -34.793 – – – –
Piskunov et al. 2008 268.451 -34.789 – – – –
Kharchenko et al. 2007 268.45 -34.79 – 1.2 – -14.21
Piskunov et al. 2007 268.451 -34.789 – – – –
Ahumada & Lapasset 2007 268.475 -34.8 – – – –
van den Bergh 2006 268.45 -34.783 – – – –
Kharchenko et al. 2005 268.45 -34.79 – 2.83 -5.14 -14.21
Kharchenko et al. 2003 268.47 -34.8 – 2.82 -5.26 –
Chen et al. 2003 268.476 -34.812 – – – –
Dias et al. 2002 268.462 -34.793 – 1.67 -3.6 -14.78
Lynga 1987 268.493 -34.809 – – – -12.0
van den Bergh & Hagen 1975 267.65 -34.8 – – – –
Sulentic et al. 1973 268.493 -34.804 – – – –

💡 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– 0.28 0.32 0.65 224 0.038 791 0.285 2
Yan et al. 2026 – – – 223 – – – –
Malhotra et al. 2026 0.28 0.25 – 279 0.140 – – –
Nizovkina et al. 2025 0.24(4) 0.21(4) – 292(4) -0.044(4) – – –
Li et al. 2025 0.27 0.26 – 341 0.047 – – –
Wei et al. 2025 0.37 0.66 – 68 0.000 1247 0.14 –
Almeida et al. 2025 0.28 0.38 – 273 – 993 – –
Alfonso et al. 2024 0.29 0.30 – 271 0.020 – – –
Hunt & Reffert 2024 – – – – – 2379(1) – –
Cavallo et al. 2024 0.27 0.95 – 126 -0.040 – – –
Hunt & Reffert 2023 0.27 0.21 0.65 171 – – – –
Almeida et al. 2023 0.27 0.20 – 465 0.114 791(1) 0.43 –
Qin et al. 2023 0.32 0.38 – 200 – – – –
He et al. 2022 – 0.50 – 141 – – – –
Tarricq et al. 2022 0.28 – – 224 – – – –
Jaehnig et al. 2021 0.28(1) – – – – – – –
Rain et al. 2021 0.28 0.32 – 295 – – – 1
Richer et al. 2021 – 0.30 – 224 – – – –
Dias et al. 2021 0.28 0.38 – 273 0.019 – – –
Spina et al. 2021 0.28 – – 224 – – – –
Cantat-Gaudin et al. 2020 0.29 0.30 – 224 – – – –
Kounkel et al. 2020 0.29 0.56 – 182 – – – –
Cantat-Gaudin & Anders 2020 0.28 – – – – – – –
Liu & Pang 2019 – – – 186 -0.250 – – –
Bossini et al. 2019 0.28 0.15 – 300 0.070 – – –
Soubiran et al. 2018 0.28 – – – – – – –
Cantat-Gaudin et al. 2018 0.28 – – – – – – –
Yen et al. 2018 0.30 0.49 – 195 – – – –
Loktin & Popova 2017 0.30 0.32 – 299 – – – –
Kharchenko et al. 2016 0.30 0.69 – 178 – – – –
Kharchenko et al. 2013 0.30 0.69 – 178 0.140 – – –
Gozha et al. 2012 0.30 – – 299 0.140 661 – –
Piskunov et al. 2008 0.30 0.32 – 166 – 735(1) – –
Piskunov et al. 2007 0.30 0.32 – 166 – 436 – –
Ahumada & Lapasset 2007 – 0.32 – 302 – – – 2
van den Bergh 2006 0.30 0.32 – 302 – – – –
Kharchenko et al. 2005 0.30 0.32 – 166 – – – –
Kharchenko et al. 2003 0.28 0.32 – – – – – –
Chen et al. 2003 0.30 0.32 – 290 0.030(1) – – –
Dias et al. 2002 0.30 0.32 – 299 0.140 – – –
Lynga 1987 0.24 0.09 – 224 – – – –

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

Visualization
ℹī¸
NGC 6475 UCC
NGC 6475 HUNT23
NGC 6475 CANTAT20
Galactocentric position diagram