NGC 1977

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UTI:
UCC Trust Index

C_N C_dens C_C3 C_lit C_dup
0.79 1.0 0.62 0.79 0.82
C3
N_50
r_50
AC 195 14.8
Summary

NGC 1977 is a rich, very dense object of intermediate C3 quality. It is located at a very close distance from the Sun, below the mid-plane. It is well-studied in the literature.

This is very likely a unique object, which shares a small percentage of members with at least one previously reported entry.

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Positions

Reference RA DEC Plx pmRA pmDE Rv
Dias et al. (2002) 83.817 -4.82 – 3.24 1.34 8.97
Piskunov et al. (2008) 83.844 -4.814 – – – –
Loktin & Popova (2017) 83.82 -4.819 – 3.24 1.34 26.4
Donor et al. (2020) 83.888 -4.83 – 1.09 -0.91 29.6
Cantat-Gaudin et al. (2020) 83.815 -4.819 2.521 1.271 -0.753 –
Dias et al. (2021) 83.77 -4.787 2.523 1.218 -0.701 29.36
He et al. (2022) 83.846 -5.273 2.495 1.417 -0.189 –
Alfonso et al. (2024) 83.807 -4.792 2.507 1.263 -0.446 –
Almeida et al. (2025) 83.77 -4.787 – – – –
           
UCC 83.838 -4.862 2.53 1.262 -0.712 23.871
Galactocentric position Galactocentric position diagram

How are the galactocentric plots generated?

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Estimated members

NGC 1977 UCC
NGC 1977 CANTAT20

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Fundamental parameters

Reference Values
Dias et al. (2002) E(B-V)=0.05, Dist=500.0, Age=7.08
Piskunov et al. (2008) E(B-V)=0.05, Dist=500, logt=7.08, logMA=1.441
Loktin & Popova (2017) E(B-V)=0.1, Dist=435, logt=6.83
Donor et al. (2020) Fe/H=-0.21
Cantat-Gaudin et al. (2020) AVNN=1.64, DistPc=407.0, AgeNN=7.99
Dias et al. (2021) Av=0.344, Dist=381, logage=6.721, [Fe/H]=-0.184
Tarricq et al. (2022) Dist=401, logAgeNN=7.99
He et al. (2022) A0=0.05, logAge=6.55
Alfonso et al. (2024) AV=1.63994, MOD=8.03465, logAge=7.97590, Z=-0.1834
Almeida et al. (2025) AV=0.344, Dist=381, logAge=6.721, MassRk=132.9

Search coordinates in Bayestar19

Cluster region map

Objects with shared members

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
OCSN 244 41.5 83.82 -5.42 2.54 1.31 0.34 22.67 0.33
NGC 1976 17.9 83.82 -5.39 2.49 1.23 0.49 19.92 0.79