NGC 2451

(NGC 2451A; Collinder 161; VDBH 9; MWSC 1308; OCL 716; vdBergh-Hagen 9; ESO 311 08; Escorial 24; FoF 2437; OCSN 230)

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0.98 UTI
0.9
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 492
Stellar density (N50/rad) 35.4 [N/pc2]
C3 classification AA
  • CN 0.9 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 2451 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, young cluster, but with a large variance across recent sources for the absorption 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: good fit.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Rain et al. (2021)
This cluster was include in (Dias et al., 2002A&A...389..871D, Cat. B/ocl) however, parameters log(t)=7.647, Av=0.000, [Fe/H]=0.00 were taken from Bossini et al. (2019A&A...623A.108B, Cat. J/A+A/623/A108). Ahumada & Lapasset (2007A&A...463..789A, Cat. J/A+A/463/789) cite star DR2 5585285049228526080=HD 61831 as a possible blue straggler; however, according to Cantat-Gaudin et al. (2018A&A...618A..93C, Cat. J/A+A18/A93), it is not a member. The same study considered this cluster and NGC 2451B as a single one. In this catalogue, instead, we separate both clusters.

Ahumada & Lapasset (2007)
The diagrams in (1976ApJS...30...97D) and (1967MNSSA..26...30W) were examined. Star 175 is HD 61831, star 283 is HD 63465. Adopted cluster centre: star 962 (1967MNSSA..26...30W). The ubvy-beta study (1983AJ.....88..197E) casts doubt on the physical reality of this cluster. Star 283 is cited as a blue straggler in (1985A&A...153..260K). Reference (1975MSS...C01....0H) gives the spectra B3V (star 175), and B2IV/V (star 283).

Data
🔍 Search references for NGC 2451 in: SciX Simbad
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Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 115.775 -38.26 5.198 -21.001 15.361 23.453
Li et al. 2025 115.736 -38.264 5.165 -21.116 15.328 –
Almeida et al. 2025 115.752 -38.278 – – – –
Alfonso et al. 2024 115.781 -38.151 5.145 -20.891 15.211 –
Swiggum et al. 2024 115.971 -38.241 5.196 -20.987 15.327 23.418
Hunt & Reffert 2024 115.971 -38.241 5.196 -20.987 15.327 25.247
Cavallo et al. 2024 115.751 -38.24 5.197 – – –
Hunt & Reffert 2023 115.971 -38.241 5.196 -20.987 15.327 25.247
Almeida et al. 2023 115.954 -38.234 – – – –
Qin et al. 2023 115.65 -38.29 5.16 -20.93 15.12 23.89
Just et al. 2023 115.33 -38.518 – – – –
He et al. 2022 115.762 -38.277 5.202 -20.956 15.393 –
Rain et al. 2021 115.736 -38.264 5.165 -21.116 15.328 –
Richer et al. 2021 115.824 -38.383 5.157 -21.053 15.328 –
Dias et al. 2021 115.752 -38.278 5.15 -21.058 15.332 23.266
Cantat-Gaudin et al. 2020 115.736 -38.264 5.165 -21.116 15.328 –
Cantat-Gaudin & Anders 2020 115.736 -38.264 5.165 -21.116 15.328 –
Liu & Pang 2019 115.735 -38.2 5.146 -20.919 15.265 –
Bossini et al. 2019 115.736 -38.264 – – – –
Soubiran et al. 2018 115.736 -38.264 – – – 23.59
Bica et al. 2019 116.311 -37.953 – – – –
Cantat-Gaudin et al. 2018 115.736 -38.264 5.165 -21.116 15.328 –
Yen et al. 2018 115.636 -38.329 5.27 -21.21 15.42 –
Loktin & Popova 2017 115.8 -38.4 – -22.93 13.39 22.6
Kharchenko et al. 2016 115.33 -38.518 – – – –
Dias et al. 2014 115.8 -38.4 – -0.2 3.18 –
Kharchenko et al. 2013 115.335 -38.52 – -21.8 15.13 22.6
Gozha et al. 2012 115.8 -38.4 – – – –
Piskunov et al. 2008 115.316 -38.523 – – – –
Kharchenko et al. 2007 115.8 -38.4 – 1.65 – 22.63
Piskunov et al. 2007 115.316 -38.523 – – – –
Ahumada & Lapasset 2007 116.125 -37.667 – – – –
Kharchenko et al. 2005 115.32 -38.53 – -21.8 15.09 21.71
Kharchenko et al. 2003 116.2 -38.04 – -22.93 13.39 –
Dias et al. 2002 115.8 -38.4 – -22.93 13.39 22.7
Dambis 1999 116.35 -37.967 – – – –
Lynga 1987 116.341 -37.974 – – – 27.0
van den Bergh & Hagen 1975 115.875 -37.85 – – – –
Sulentic et al. 1973 116.348 -37.978 – – – –

💡 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– 0.19 0.055 0.45 52 0.000 240 0.24 1
Li et al. 2025 0.18 0.11 – 53 -0.156 – – –
Almeida et al. 2025 0.19 0.07 – 55 – 222 – –
Alfonso et al. 2024 0.20 0.00 – 43 0.050 – – –
Swiggum et al. 2024 0.19 – – 26 – 287 – –
Hunt & Reffert 2024 – – – – – 185(1) – –
Cavallo et al. 2024 0.19 0.36 – 30 -0.060 – – –
Hunt & Reffert 2023 0.19 0.04 0.45 26 – – – –
Almeida et al. 2023 0.19 0.07 – 52 0.045 342(1) 0.24 –
Qin et al. 2023 0.19 0.03 – 56 – – – –
Just et al. 2023 – – – 58 – 31 – –
He et al. 2022 – 0.45 – 63 – – – –
Spina et al. 2022 – – – – -0.068 – – –
Rain et al. 2021 0.19 0.00 – 44 – – – 0
Richer et al. 2021 – 0.09 – 35 – – – –
Dias et al. 2021 0.19 0.07 – 55 0.050 – – –
Cantat-Gaudin et al. 2020 0.20 0.00 – 35 – – – –
Kounkel et al. 2020 0.20 0.27 – 52 – – – –
Cantat-Gaudin & Anders 2020 0.19 – – – – – – –
Liu & Pang 2019 – – – 40 0.000 – – –
Bossini et al. 2019 0.19 0.00 – 44 0.000 – – –
Soubiran et al. 2018 0.19 – – – – – – –
Cantat-Gaudin et al. 2018 0.19 – – – – – – –
Yen et al. 2018 0.20 0.04 – 148 – – – –
Loktin & Popova 2017 0.21 0.15 – 34 – – – –
Kharchenko et al. 2016 0.19 0.00 – 58 – – – –
Kharchenko et al. 2013 0.19 0.00 – 58 -0.531 – – –
Gozha et al. 2012 0.19 – – 60 0.000 219 – –
Piskunov et al. 2008 0.19 0.00 – 58 – 405(1) – –
Piskunov et al. 2007 0.19 0.00 – 58 – 258 – –
Ahumada & Lapasset 2007 – 0.19 – 45 – – – 2
Kharchenko et al. 2005 0.19 0.00 – 58 – – – –
Kharchenko et al. 2003 0.22 0.32 – – – – – –
Dias et al. 2002 0.19 0.03 – 60 0.000 – – –
Dambis 1999 0.15 0.20 – 50 – – – –
Lynga 1987 0.22 0.13 – 36 -0.450 – – –

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

Visualization
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NGC 2451 UCC
NGC 2451 HUNT23
NGC 2451 CANTAT20
Galactocentric position diagram