Tombaugh 1

(Haffner 1; MWSC 1060; OCL 603; ESO 558 04; FSR 1246; FoF 18)

1.0 UTI

1.0

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 692

Stellar density (N₅₀/rad) 26.7 [N/pc²]

C3 classification AA

C_N 1.0 Very 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 1 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by low extinction. It is catalogued as a 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.

Relatively close Low extinction Massive Near-solar metallicity Old Contains BSS

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Ahumada & Lapasset (2007)
The V vs (B-V) diagram in (1983JRASC..77...31T) and the V vs. (V-I) diagram in (1995MNRAS.276..563C) were examined. Star 2 is cited as a probable straggler in (1983JRASC..77...31T).

Data

🔍 Search references for Tombaugh 1 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–	105.126	-20.576	0.388	-2.556	3.843	81.931
Li et al.	2025	105.126	-20.569	0.371	-2.564	3.833	–
Hu & Soubiran	2025	105.125	-20.588	–	–	–	–
Almeida et al.	2025	105.131	-20.576	–	–	–	–
Hunt & Reffert	2024	105.122	-20.576	0.394	-2.56	3.837	82.139
Cavallo et al.	2024	105.125	-20.588	0.394	–	–	–
Hunt & Reffert	2023	105.122	-20.576	0.394	-2.56	3.837	82.139
Almeida et al.	2023	105.129	-20.578	–	–	–	–
Cordoni et al.	2023	105.131	-20.576	0.371	-2.574	3.83	–
Just et al.	2023	105.119	-20.563	–	–	–	–
Jadhav & Subramaniam	2021	105.126	-20.569	–	–	–	–
Jaehnig et al.	2021	105.122	-20.578	0.403	-2.569	3.831	–
Rain et al.	2021	105.126	-20.569	0.371	-2.564	3.833	–
Dias et al.	2021	105.131	-20.576	0.371	-2.574	3.83	82.397
Cantat-Gaudin et al.	2020	105.126	-20.569	0.371	-2.564	3.833	–
Cantat-Gaudin & Anders	2020	105.126	-20.569	0.371	-2.564	3.833	–
Liu & Pang	2019	105.121	-20.584	0.368	-2.565	3.808	–
Bossini et al.	2019	105.126	-20.569	–	–	–	–
Soubiran et al.	2018	105.126	-20.569	–	–	–	82.77
Bica et al.	2019	105.123	-20.561	–	–	–	–
Cantat-Gaudin et al.	2018	105.126	-20.569	0.371	-2.564	3.833	–
Dias et al.	2018	–	–	–	-2.04	3.39	–
Loktin & Popova	2017	105.12	-20.567	–	-0.4	0.901	81.1
Sampedro et al.	2017	105.121	-20.567	-3.6	4.76	–	–
Kharchenko et al.	2016	105.119	-20.563	–	–	–	–
Dias et al.	2014	105.121	-20.567	–	-5.31	5.17	–
Kharchenko et al.	2013	105.124	-20.565	–	-0.99	3.97	–
Bukowiecki et al.	2011	105.112	-20.589	–	–	–	–
Ahumada & Lapasset	2007	105.125	-20.567	–	–	–	–
van den Bergh	2006	105.121	-20.567	–	–	–	–
Dias et al.	2002	105.121	-20.567	–	-5.31	5.17	81.1
Lynga	1987	105.062	-20.468	–	–	–	–

💡 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–	2.5	0.9	1.09	1161	-0.119	1075	0.525	1
Li et al.	2025	2.76	0.84	–	1078	0.039	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.260⁽⁵⁾	–	–	–
Almeida et al.	2025	2.25	0.91	–	1279	–	989	–	–
Hunt & Reffert	2024	–	–	–	–	–	2445⁽¹⁾	–	–
Cavallo et al.	2024	2.32	0.71	–	1380	0.110	–	–	–
Hunt & Reffert	2023	2.30	0.40	1.09	1253	–	–	–	–
Almeida et al.	2023	2.37	0.87	–	1321	-0.095	810⁽¹⁾	0.51	–
Cordoni et al.	2023	2.26	0.91	–	1279	-0.119	1075	0.54	1⁽¹⁾
Just et al.	2023	–	–	–	1161	–	726	–	–
Jadhav & Subramaniam	2021	2.56	0.66	–	1259	–	1458	–	1⁽¹⁾
Jaehnig et al.	2021	2.48⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	2.50	0.95	–	955	–	–	–	0
Dias et al.	2021	2.25	0.91	–	1279	-0.119	–	–	–
Cantat-Gaudin et al.	2020	2.56	0.66	–	1259	–	–	–	–
Kounkel et al.	2020	2.60	0.99	–	955	–	–	–	–
Cantat-Gaudin & Anders	2020	2.50	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	1450	-0.250	–	–	–
Bossini et al.	2019	2.74	0.79	–	979	0.000	–	–	–
Soubiran et al.	2018	2.50	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.50	–	–	–	–	–	–	–
Loktin & Popova	2017	4.76	1.17	–	724	–	–	–	–
Kharchenko et al.	2016	2.64	0.89	–	1161	–	–	–	–
Perren et al.	2015	3.30⁽¹⁾	1.89⁽¹⁾	–	398⁽¹⁾	-0.200⁽¹⁾	–	–	–
Kharchenko et al.	2013	2.64	0.89	–	1161	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	1917	–	–
Bukowiecki et al.	2011	2.39⁽¹⁾	0.76	–	1000	–	–	–	–
Ahumada & Lapasset	2007	–	1.26	–	1000	–	–	–	4
van den Bergh	2006	3.00	1.26	–	1000	–	–	–	–
Dias et al.	2002	4.17	0.96	–	955	–	–	–	–

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

Visualization

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