Tombaugh 4

(MWSC 199; OCL 349; FSR 0585)

0.96 UTI

0.8

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 222

Stellar density (N₅₀/rad) 70.7 [N/pc²]

C3 classification AA

C_N 0.8 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 1.0 Very well-studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Tombaugh 4 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by high extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

Distant High extinction Massive Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for Tombaugh 4 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–	37.298	61.788	0.295	-1.059	-0.207	-42.478
Hu & Soubiran	2025	37.317	61.791	–	–	–	–
Almeida et al.	2025	37.333	61.78	–	–	–	–
Hunt & Reffert	2024	37.294	61.79	0.3	-1.066	-0.224	-43.66
Cavallo et al.	2024	37.317	61.791	0.297	–	–	–
Hunt & Reffert	2023	37.294	61.79	0.3	-1.066	-0.224	-43.66
Just et al.	2023	37.277	61.783	–	–	–	–
Dias et al.	2021	37.333	61.78	0.255	-1.035	-0.144	-74.103
Spina et al.	2021	37.302	61.789	0.258	-1.05	-0.157	–
Cantat-Gaudin et al.	2020	37.305	61.787	0.275	-1.057	-0.163	–
Cantat-Gaudin & Anders	2020	37.305	61.787	0.275	-1.057	-0.163	–
Bica et al.	2019	37.288	61.783	–	–	–	–
Cantat-Gaudin et al.	2018	37.305	61.787	0.275	-1.057	-0.163	–
Loktin & Popova	2017	37.29	61.784	–	0.184	-3.132	–
Kharchenko et al.	2016	37.277	61.783	–	–	–	–
Dias et al.	2014	37.225	61.783	–	2.05	-5.23	–
Kharchenko et al.	2013	37.29	61.785	–	0.91	-2.72	–
Kharchenko et al.	2012	37.29	61.785	–	0.91	-2.72	–
Bukowiecki et al.	2011	37.308	61.79	–	–	–	–
Dias et al.	2002	37.225	61.783	–	2.05	-5.23	–

💡 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–	3.435	3.62	2.29	682	-0.475	1254	–	–
Hu & Soubiran	2025	–	–	–	–	-0.490⁽⁵⁾	–	–	–
Almeida et al.	2025	3.01	3.36	–	841	–	1296	–	–
Hunt & Reffert	2024	–	–	–	–	–	2390⁽¹⁾	–	–
Cavallo et al.	2024	2.72	3.70	–	912	-0.110	–	–	–
Hunt & Reffert	2023	2.96	3.54	2.29	682	–	–	–	–
Just et al.	2023	–	–	–	437	–	532	–	–
Dias et al.	2021	3.01	3.36	–	841	-0.475	–	–	–
Spina et al.	2021	3.59	–	–	1585	–	–	–	–
Cantat-Gaudin et al.	2020	3.58	2.69	–	1585	–	–	–	–
Cantat-Gaudin & Anders	2020	3.29	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	3.29	–	–	–	–	–	–	–
Loktin & Popova	2017	1.95	3.62	–	417	–	–	–	–
Kharchenko et al.	2016	3.70	3.87	–	437	–	–	–	–
Kharchenko et al.	2013	3.70	3.87	–	437	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	1211	–	–
Kharchenko et al.	2012	3.70	3.87	–	437	–	–	–	–
Bukowiecki et al.	2011	4.09⁽¹⁾	2.73	–	1122	–	–	–	–
Dias et al.	2002	3.85	3.88	–	501	–	–	–	–

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

Visualization

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