Trumpler 31

(MWSC 2769)

0.43 UTI

0.5

C_N

0.59

C_dens

0.38

C_C3

0.35

C_lit

1.0

C_dup

N₅₀ (P>50% members) 51

Stellar density (N₅₀/rad) 2.9 [N/pc²]

C3 classification CB

C_N 0.5 Moderately populated
C_dens 0.59 Moderately dense
C_C3 0.38 Low quality
C_lit 0.35 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Trumpler 31 is a moderately populated, moderately dense object of low C3 quality. Its parallax locates it at a moderate^* distance, below the mid-plane, affected by moderate extinction. It is catalogued as an intermediate-age cluster (see Parameters). It is poorly studied in the literature, with no articles listed in the last 10 years.

(*): The parallax distance estimate (~3.26 kpc) differs significantly from the median photometric distance (~0.99 kpc).

Close Moderate extinction Intermediate age

Data

🔍 Search references for Trumpler 31 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–	269.949	-28.235	0.307	-7.446	-6.052	–
Kharchenko et al.	2016	269.923	-28.208	–	–	–	–
Dias et al.	2014	269.954	-28.167	–	-1.08	-4.47	–
Kharchenko et al.	2013	269.932	-28.207	–	-2.77	-4.03	–
van den Bergh	2006	269.975	-28.183	–	–	–	–
Kharchenko et al.	2003	269.91	-28.18	–	-1.22	-2.09	–
Dias et al.	2002	269.954	-28.167	–	-1.21	-4.59	–

💡 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–	0.99	1.08	–	586	–	–	–	–
Kharchenko et al.	2016	0.83	1.48	–	432	–	–	–	–
Kharchenko et al.	2013	0.83	1.48	–	432	–	–	–	–
van den Bergh	2006	0.99	1.08	–	741	–	–	–	–
Kharchenko et al.	2003	1.00	0.62	–	–	–	–	–	–
Dias et al.	2002	0.99	1.08	–	741	–	–	–	–

Visualization

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