Tombaugh 2

(Haffner 2; MWSC 1076; OCL 605; ESO 558 07; FSR 1250)

0.95 UTI

1.0

C_N

1.0

C_dens

0.75

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 796

Stellar density (N₅₀/rad) 42.3 [N/pc²]

C3 classification AB

C_N 1.0 Very rich
C_dens 1.0 Very dense
C_C3 0.75 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 2 is a very rich, very dense object of high C3 quality. Its parallax locates it at a large distance, well below the mid-plane, affected by low extinction. It is catalogued as a very massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the metallicity and mass parameters (see Parameters). It is very well-studied in the literature.

Note: This object contains blue stragglers according to at least one source.

Very distant Low extinction Very massive Near-solar metallicity Old Contains BSS

Almeida et al. (2025)
Mass determination: invalid due to poor quality CMD. Isochrone match: worst fit.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Tombaugh 2 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–	105.777	-20.818	0.107	-0.511	1.401	122.805
Hu & Soubiran	2025	105.778	-20.814	–	–	–	–
Almeida et al.	2025	105.772	-20.819	–	–	–	–
Hunt & Reffert	2024	105.777	-20.817	0.114	-0.511	1.409	119.628
Cavallo et al.	2024	105.778	-20.814	0.112	–	–	–
Hunt & Reffert	2023	105.777	-20.817	0.114	-0.511	1.409	119.628
Just et al.	2023	105.766	-20.813	–	–	–	–
Perren et al.	2022	105.773	-20.82	–	–	–	–
Jaehnig et al.	2021	105.773	-20.82	0.107	-0.508	1.366	–
Rain et al.	2021	105.773	-20.82	0.079	-0.464	1.349	–
Dias et al.	2021	105.772	-20.819	0.085	-0.457	1.351	114.337
Cantat-Gaudin et al.	2020	105.773	-20.82	0.079	-0.464	1.349	–
Cantat-Gaudin & Anders	2020	105.773	-20.82	0.079	-0.464	1.349	–
Bica et al.	2019	105.77	-20.815	–	–	–	–
Cantat-Gaudin et al.	2018	105.773	-20.82	0.079	-0.464	1.349	–
Kharchenko et al.	2016	105.766	-20.813	–	–	–	–
Dias et al.	2014	105.771	-20.817	–	-1.72	3.86	–
Kharchenko et al.	2013	105.771	-20.815	–	1.7	2.01	125.0
Gozha et al.	2012	105.771	-20.817	–	–	–	–
Kharchenko et al.	2007	105.76	-20.82	–	0.03	–	–
van den Bergh	2006	105.85	-20.85	–	–	–	–
Chen et al.	2003	105.77	-20.815	–	–	–	–
Dias et al.	2002	105.771	-20.817	–	-1.72	3.86	120.9

💡 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–	8.845	0.93	1.82	1322	-0.340	6326	0.45	27.0
Hu & Soubiran	2025	–	–	–	–	-0.400⁽⁵⁾	–	–	–
Almeida et al.	2025	8.98	0.89	–	2265	–	8478	–	–
Hunt & Reffert	2024	–	–	–	–	–	4173⁽¹⁾	–	–
Cavallo et al.	2024	6.37	0.93	–	2570	-0.370	–	–	–
Hunt & Reffert	2023	7.68	0.57	1.82	1698	–	–	–	–
Just et al.	2023	–	–	–	1023	–	2239	–	–
Perren et al.	2022	8.71	1.21	–	2138	-0.480	21000	0.45	–
Jaehnig et al.	2021	9.81⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	9.27	0.93	–	1023	–	–	–	27
Dias et al.	2021	8.98	0.89	–	2265	-0.178	–	–	–
Cantat-Gaudin et al.	2020	9.33	0.83	–	1622	–	–	–	–
Cantat-Gaudin & Anders	2020	9.27	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	9.27	–	–	–	–	–	–	–
Kharchenko et al.	2016	6.57	1.10	–	1023	–	–	–	–
Kharchenko et al.	2013	6.57	1.10	–	1023	-0.310	–	–	–
Gozha et al.	2012	6.08	–	–	1023	-0.310	–	–	–
van den Bergh	2006	13.26	0.25	–	1023	–	–	–	–
Chen et al.	2003	6.30	1.24	–	4000	-0.450⁽¹⁾	–	–	–
Dias et al.	2002	6.08	0.93	–	1023	-0.310	–	–	–

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

Visualization

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