NGC 1931

0.76 UTI

0.68

C_N

1.0

C_dens

0.75

C_C3

0.7

C_lit

1.0

C_dup

C3 classification AB

Number of members (P>50%) 85

Radius (P>50% members) 1.5 [arcmin]

C_N 0.68 Moderately populated
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.7 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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NGC 1931 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is moderately studied in the literature.

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

Relatively close Moderate extinction Near-solar metallicity Very young

Cavallo et al. (2024)
Bronze sample.

Data

🔍 Search references for NGC 1931 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	–	82.851	34.226	0.436	0.216	-2.028	-20.833
Hunt & Reffert	2024	82.852	34.224	0.424	0.237	-2.036	-20.834
Cavallo et al.	2024	82.843	34.224	0.425	–	–	–
Hunt & Reffert	2023	82.852	34.224	0.424	0.237	-2.036	-20.834
Jaehnig et al.	2021	82.804	34.238	0.455	0.302	-1.935	–
Sánchez et al.	2020	82.854	34.245	–	0.384	-1.813	–
Loktin & Popova	2017	82.86	34.245	–	-0.011	-1.655	–
Dias et al.	2014	82.854	34.245	–	-0.29	-3.48	–
Gozha et al.	2012	82.854	34.245	–	–	–	–
Glushkova et al.	2010	82.858	34.214	–	–	–	–
van den Bergh	2006	82.861	34.249	–	–	–	–
Dias et al.	2002	82.854	34.245	–	-0.29	-3.48	–
Dambis	1999	82.861	34.249	–	–	–	–

💡 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]	Bfr	BSS
Hunt & Reffert	2024	–	–	–	–	–	459*	–	–
Cavallo et al.	2024	1.98	1.11	–	83	0.260	–	–	–
Hunt & Reffert	2023	2.12	1.92	2.45	12	–	–	–	–
Jaehnig et al.	2021	2.26*	–	–	–	–	–	–	–
Loktin & Popova	2017	3.07	2.29	–	10	–	–	–	–
Gozha et al.	2012	3.09	–	–	10	-0.060	–	–	–
Glushkova et al.	2010	1.00	6.11	–	10	–	–	–	–
van den Bergh	2006	3.09	2.29	–	10	–	–	–	–
Dias et al.	2002	2.30	2.29	–	2	–	–	–	–
Dambis	1999	2.19	1.68	–	13	–	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 3181	90.6	82.85	34.22	0.45	0.21	-2.0	-20.83	0.06

💡 Note: The % column shows the percentage of members that NGC 1931 shares with each listed object.

Visualization

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