NGC 1977

0.79 UTI

0.79

C_N

1.0

C_dens

0.62

C_C3

0.77

C_lit

1.0

C_dup

N_m (P>50%) 195

Core radius and density 1.1 [pc], 18 [pc^-2]

C3 classification AC

C_N 0.79 Rich
C_dens 1.0 Very dense
C_C3 0.62 Intermediate quality
C_lit 0.77 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 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 low-mass, near-solar metallicity, very young cluster, but with a large variance across recent sources for the absorption and age parameters (see Parameters). It is well-studied in the literature.

Note: This object shares a large percentage of members with 5 later reported entries. See table with shared members information.

Very close Low extinction Low mass Near-solar metallicity Very young

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
Sampedro et al.	2017	83.817	-4.82	–	3.75	0.75	–
Joshi et al.	2016	83.887	-4.83	–	–	–	–
Netopil et al.	2016	83.817	-4.821	–	–	–	–
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
Lynga	1987	83.844	-4.836	–	–	–	–
Sulentic et al.	1973	83.859	-4.801	–	–	–	–

💡 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–	0.41	0.27	–	12	-0.183	28	–	–
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	–	–	–	–
Spina et al.	2022	–	–	–	–	-0.339	–	–	–
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	0.32	–	7	–	–	–	–
Joshi et al.	2016	0.36	0.33	–	4	–	28	–	–
Netopil et al.	2016	8.36	–	–	10	-0.060⁽²⁾	–	–	–
Heiter et al.	2014	–	–	–	–	-0.060	–	–	–
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-1	8.7	83.82	-5.37	2.5	0.95	-0.07	-7.13	0.39
Orion Nebula	7.7	83.82	-5.36	2.51	1.23	0.18	25.16	0.34
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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