Saurer 1

(MWSC 1184)

0.28 UTI

0.0

C_N

0.05

C_dens

0.38

C_C3

0.48

C_lit

1.0

C_dup

N_m (P>50%) 22

Core radius and density 3.2 [pc], 0.2 [pc^-2]

C3 classification CB

C_N 0.0 Sparse
C_dens 0.05 Very loose
C_C3 0.38 Low quality
C_lit 0.48 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Saurer 1 is a sparse, very loose object of low C3 quality. Its parallax locates it at a very large distance, well above the mid-plane, affected by low extinction. It is catalogued as an extremely massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is poorly studied in the literature.

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

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

Perren et al. (2022)
First reported in Saurer 1994; analyzed by Carraro 2003 as Saurer A, who placed the TO at V=19 and estimated ~5 Gyr and 13.8 kpc. Our CMD also shows the TO at G=19, with a visible RGB and a handful of likely RC stars. ASteCA gives 12.4 kpc and 6.6 Gyr — the distance is in close agreement with Carraro 2003 given the uncertainties. Frinchaboy 2006 gives 13.1 kpc and 4.5 Gyr. Saurer 1 was previously thought to hold the record for largest galactocentric distance; this work finds Berkeley 29 to be ~2 kpc farther out.

Data

🔍 Search references for Saurer 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–	110.229	1.811	0.083	-0.305	-0.352	103.402
Cui et al.	2025	110.232	1.811	0.07	-0.26	-0.33	–
He et al.	2023	110.232	1.813	0.072	-0.263	-0.332	103.4
Just et al.	2023	110.226	1.802	–	–	–	–
Perren et al.	2022	110.225	1.8	–	–	–	–
Netopil et al.	2022	110.233	1.808	–	–	–	104.6
Donor et al.	2020	110.234	1.8	–	-0.36	-0.39	105.0
Bica et al.	2019	110.237	1.809	–	–	–	–
Kharchenko et al.	2016	110.226	1.802	–	–	–	–
Netopil et al.	2016	110.225	1.8	–	–	–	–
Kharchenko et al.	2013	110.233	1.8	–	3.46	-6.73	95.3
Gozha et al.	2012	110.233	1.808	–	–	–	–
Bukowiecki et al.	2011	110.237	1.839	–	–	–	–
Kharchenko et al.	2007	110.23	1.81	–	0.02	–	–
van den Bergh	2006	110.225	1.8	–	–	–	–
Dias et al.	2002	110.233	1.808	–	3.46	-6.73	98.0

💡 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–	13.46	0.395	–	4496	-0.380	10081	0.81	1
Cui et al.	2025	–	0.43	–	6310	–	–	–	1⁽¹⁾
He et al.	2023	15.85	0.65	–	2512	–	–	–	–
Just et al.	2023	–	–	–	3981	–	10162	–	–
Perren et al.	2022	12.36	0.41	–	6607	-0.080	10000	0.81	–
Spina et al.	2022	–	–	–	–	-0.420	–	–	–
Netopil et al.	2022	13.18⁽¹⁾	–	–	5012	-0.420⁽¹⁾	–	–	–
Donor et al.	2020	–	–	–	–	-0.420	–	–	–
Kharchenko et al.	2016	13.72	0.13	–	3981	–	–	–	–
Netopil et al.	2016	21.38	–	–	3490	-0.380⁽²⁾	–	–	–
Heiter et al.	2014	–	–	–	–	-0.380	–	–	–
Kharchenko et al.	2013	13.72	0.13	–	3981	-0.380	–	–	–
Gozha et al.	2012	13.20	–	–	5012	-0.380	–	–	–
Bukowiecki et al.	2011	16.49⁽¹⁾	0.22	–	1995	–	–	–	–
van den Bergh	2006	11.97	0.38	–	7079	–	–	–	–
Dias et al.	2002	13.20	0.44	–	5012	-0.380	–	–	–

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

Visualization

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