NGC 1977

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0.88 UTI
0.79
CN
1.0
Cdens
0.62
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 195
Stellar density (N50/rad) 67.3 [N/pc2]
C3 classification AC
  • CN 0.79 Rich
  • Cdens 1.0 Very dense
  • CC3 0.62 Intermediate 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
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NGC 1977 is a rich, very dense object of intermediate C3 quality. Its parallax locates it at a very close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the absorption and age parameters (see Parameters). It is very well-studied in the literature.

Note: This object shares a large percentage of members with 3 later reported entries. See table with shared members information.

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

Data
🔍 Search references for NGC 1977 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– 83.838 -4.862 2.53 1.262 -0.712 23.871
Li et al. 2025 83.815 -4.819 2.521 1.271 -0.753 –
Almeida et al. 2025 83.77 -4.787 – – – –
Alfonso et al. 2024 83.807 -4.792 2.507 1.263 -0.446 –
He et al. 2022 83.846 -5.273 2.495 1.417 -0.189 –
Dias et al. 2021 83.77 -4.787 2.523 1.218 -0.701 29.36
Spina et al. 2021 83.814 -4.81 2.524 1.228 -0.733 –
Cantat-Gaudin et al. 2020 83.815 -4.819 2.521 1.271 -0.753 –
Donor et al. 2020 83.888 -4.83 – 1.09 -0.91 29.6
Loktin & Popova 2017 83.82 -4.819 – 3.24 1.34 26.4
Dias et al. 2014 83.817 -4.82 – 3.24 1.34 –
Gozha et al. 2012 83.817 -4.82 – – – –
Bukowiecki et al. 2011 83.838 -4.823 – – – –
Piskunov et al. 2008 83.844 -4.814 – – – –
Kharchenko et al. 2007 83.82 -4.82 – 0.21 – 25.27
Kharchenko et al. 2005 83.85 -4.82 – 2.42 -1.9 25.26
Kharchenko et al. 2003 83.85 -4.83 – 3.56 -1.72 –
Dias et al. 2002 83.817 -4.82 – 3.24 1.34 8.97

💡 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– 0.41 0.22 – 12 -0.184 80 – –
Li et al. 2025 0.35 0.22 – 7 -0.153 – – –
Almeida et al. 2025 0.38 0.34 – 5 – 133 – –
Alfonso et al. 2024 0.40 1.64 – 95 -0.183 – – –
He et al. 2022 – 0.05 – 4 – – – –
Tarricq et al. 2022 0.40 – – 98 – – – –
Dias et al. 2021 0.38 0.34 – 5 -0.184 – – –
Spina et al. 2021 0.40 – – 98 -0.338(20) – – –
Cantat-Gaudin et al. 2020 0.41 1.64 – 98 – – – –
Donor et al. 2020 – – – – -0.210 – – –
Loktin & Popova 2017 0.43 0.31 – 7 – – – –
Gozha et al. 2012 0.48 – – 12 – 28 – –
Piskunov et al. 2008 0.50 0.16 – 12 – – – –
Kharchenko et al. 2005 0.50 0.16 – 12 – – – –
Kharchenko et al. 2003 0.48 0.16 – – – – – –
Dias et al. 2002 0.50 0.16 – 12 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
OCSN 225 95.4 83.84 -4.96 2.55 1.25 -0.08 22.73 0.36
UBC 621 88.7 83.83 -4.86 2.53 1.25 -0.72 22.95 0.05
OMC 2 2.6 83.85 -5.17 2.54 1.04 -0.02 26.69 0.17

💡 Note: The % column shows the percentage of members that NGC 1977 shares with each listed object.

Visualization
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NGC 1977 UCC
NGC 1977 CANTAT20
Galactocentric position diagram