NGC 1976

(Trapezium; Ori Trapezium; Trapezium-FG)

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UTI:
UCC Trust Index

C_N C_dens C_C3 C_lit C_dup
1.0 1.0 0.62 0.69 1.0
C3
N_50
r_50
AC 597 5.0
Summary

NGC 1976 is a very 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 moderately studied in the literature.

This object shares a significant percentage of members with 9 later reported entries.

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Positions

Reference RA DEC Plx pmRA pmDE Rv
Dambis (1999) 83.822 -5.391 – – – –
Dias et al. (2002) 83.817 -5.39 – 2.05 1.56 31.98
Kharchenko et al. (2003) 83.85 -5.38 – 2.02 -0.19 –
Kharchenko et al. (2005) 83.82 -5.39 – 1.96 -0.77 28.94
Piskunov et al. (2007) 83.813 -5.392 – – – –
Kharchenko et al. (2007) 83.82 -5.39 – 0.4 – 28.94
Piskunov et al. (2008) 83.813 -5.392 – – – –
Loktin & Popova (2017) 83.82 -5.39 – 2.05 1.56 28.9
Dias et al. (2021) 83.835 -5.41 2.557 1.262 0.274 23.841
Jaehnig et al. (2021) 83.829 -5.417 2.57 1.276 0.176 –
Almeida et al. (2025) 83.835 -5.41 – – – –
           
UCC 83.821 -5.392 2.493 1.23 0.492 19.918
Galactocentric position Galactocentric position diagram

How are the galactocentric plots generated?

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Estimated members

NGC 1976 UCC

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Fundamental parameters

Reference Values
Dambis (1999) E_B-V_=0.06, DM0=7.81, log_age_=6.5
Dias et al. (2002) E(B-V)=0.05, Dist=414.0, Age=7.11
Kharchenko et al. (2003) E(B-V)=0.06, Dist=450
Kharchenko et al. (2005) E(B-V)=0.05, Dist=399, logt=7.71
Piskunov et al. (2007) E(B-V)=0.05, Dist=399, logt=7.71, logM=1.762
Piskunov et al. (2008) E(B-V)=0.05, Dist=399, logt=7.71, logM=2.222, logMA=1.988
Loktin & Popova (2017) E(B-V)=0.31, Dist=488, logt=7.01
Dias et al. (2021) Av=0.246, Dist=381, logage=6.778, [Fe/H]=-0.146
Jaehnig et al. (2021) dmode=0.388
Almeida et al. (2025) AV=0.246, Dist=381, logAge=6.778, MassRk=237.5

Search coordinates in Bayestar19

Cluster region map

Objects with shared members

Cluster % RA DEC Plx pmRA pmDE Rv UTI
OCSN 244 62.8 83.82 -5.42 2.54 1.31 0.34 22.67 0.33
OCSN 225 20.1 83.84 -4.96 2.55 1.25 -0.08 22.73 0.36
NGC 1977 5.9 83.84 -4.86 2.53 1.26 -0.71 23.87 0.65
UBC 621 5.2 83.83 -4.86 2.53 1.25 -0.72 22.95 0.05
UBC 208 4.7 83.81 -5.95 2.6 1.24 0.54 23.25 0.06
NGC 1980 3.5 83.82 -5.96 2.6 1.24 0.55 20.88 0.84
OCSN 226 3.0 83.82 -5.96 2.61 1.26 0.55 23.02 0.02
OC 0345 0.7 83.77 -5.87 2.58 1.06 0.21 19.86 0.03
UBC 207 0.3 83.87 -4.61 2.57 1.11 0.57 20.54 0.52