NGC 1976

(Trapezium; Ori Trapezium; Trapezium-FG)

0.78 UTI

0.6

C_N

1.0

C_dens

0.62

C_C3

0.84

C_lit

1.0

C_dup

N₅₀ (P>50% members) 69

Stellar density (N₅₀/rad) 28.9 [N/pc²]

C3 classification AC

C_N 0.6 Moderately populated
C_dens 1.0 Very dense
C_C3 0.62 Intermediate quality
C_lit 0.84 Well-studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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NGC 1976 is a moderately populated, 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 metallicity and mass parameters (see Parameters). It is well-studied in the literature.

Note: This object shares a significant percentage of members with 9 later reported entries. See table with shared members information.

Very close Low extinction Near-solar metallicity Very young

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

Lada & Lada (2003)
Embedded cluster within ∼2 Kpc of the Sun.

Data

🔍 Search references for NGC 1976 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–	83.821	-5.452	2.579	1.254	0.19	19.859
Wei et al.	2025	83.823	-5.418	2.564	1.156	0.246	–
Almeida et al.	2025	83.835	-5.41	–	–	–	–
Jaehnig et al.	2021	83.829	-5.417	2.57	1.276	0.176	–
Dias et al.	2021	83.835	-5.41	2.557	1.262	0.274	23.841
Loktin & Popova	2017	83.82	-5.39	–	2.05	1.56	28.9
Dias et al.	2014	83.817	-5.39	–	2.05	1.56	–
Gozha et al.	2012	83.817	-5.39	–	–	–	–
Piskunov et al.	2008	83.813	-5.392	–	–	–	–
Kharchenko et al.	2007	83.82	-5.39	–	0.4	–	28.94
Piskunov et al.	2007	83.813	-5.392	–	–	–	–
van den Bergh	2006	83.822	-5.391	–	–	–	–
Kharchenko et al.	2005	83.82	-5.39	–	1.96	-0.77	28.94
Lada & Lada	2003	84.448	-5.363	–	–	–	–
Kharchenko et al.	2003	83.85	-5.38	–	2.02	-0.19	–
Dias et al.	2002	83.817	-5.39	–	2.05	1.56	31.98
Dambis	1999	83.822	-5.391	–	–	–	–

💡 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]	B_frac	BSS
UCC	99999–	0.4	0.19	–	13	0.177	202	0.47	–
Wei et al.	2025	0.49	0.95	–	13	0.500	2585	0.47	–
Almeida et al.	2025	0.38	0.25	–	6	–	238	–	–
Jaehnig et al.	2021	0.39⁽¹⁾	–	–	–	–	–	–	–
Dias et al.	2021	0.38	0.25	–	6	-0.146	–	–	–
Loktin & Popova	2017	0.49	0.96	–	10	–	–	–	–
Gozha et al.	2012	0.41	–	–	13	–	98	–	–
Piskunov et al.	2008	0.40	0.16	–	51	–	167⁽¹⁾	–	–
Piskunov et al.	2007	0.40	0.16	–	51	–	58	–	–
van den Bergh	2006	0.40	0.16	–	13	–	–	–	–
Kharchenko et al.	2005	0.40	0.16	–	51	–	–	–	–
Lada & Lada	2003	0.50	–	–	–	–	413	–	–
Kharchenko et al.	2003	0.45	0.19	–	–	–	–	–	–
Dias et al.	2002	0.41	0.16	–	13	–	–	–	–
Dambis	1999	0.36	0.19	–	3	–	–	–	–

(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	73.9	83.84	-4.96	2.55	1.25	-0.08	22.73	0.36
UBC 208	47.8	83.81	-5.95	2.6	1.24	0.54	23.25	0.06
NGC 1980	42.0	83.82	-5.96	2.6	1.24	0.55	20.88	0.82
OCSN 244	39.1	83.82	-5.43	2.52	1.39	0.33	25.62	0.25
OCSN 226	36.2	83.82	-5.96	2.61	1.26	0.55	23.02	0.02
OC 0345	15.9	83.77	-5.87	2.58	1.06	0.21	19.86	0.03
OC 0347	11.6	83.99	-6.36	2.6	1.01	0.32	24.19	0.31
OMC 2	11.6	83.85	-5.17	2.54	1.04	-0.02	26.69	0.17
UBC 207	1.4	83.87	-4.61	2.57	1.11	0.57	20.54	0.53

💡 Note: The % column shows the percentage of members that NGC 1976 shares with each listed object.

Visualization

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