Saurer 4

(MWSC 2009)

0.15 UTI

0.0

C_N

0.0

C_dens

0.25

C_C3

0.26

C_lit

1.0

C_dup

N_m (P>50%) 7

Core radius and density 14 [pc], 0.02 [pc^-2]

C3 classification CC

C_N 0.0 Sparse
C_dens 0.0 Very loose
C_C3 0.25 Low quality
C_lit 0.26 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

ℹ️

Saurer 4 is a sparse, very loose object of low C3 quality. Its parallax locates it at a very large^* distance, below the mid-plane, affected by high extinction. It is catalogued as a low-mass, old cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~10.72 kpc) differs significantly from the median photometric distance (~6.19 kpc).

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

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Very distant High extinction Low mass Old Contains BSS

Data

🔍 Search references for Saurer 4 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	183.5	-63.59	0.093	-7.218	0.815	9.537
Cui et al.	2025	183.508	-63.591	0.08	-6.89	0.8	–
He et al.	2023	183.509	-63.592	0.076	-6.893	0.798	8.81
Just et al.	2023	183.494	-63.586	–	–	–	–
Bica et al.	2019	183.515	-63.591	–	–	–	–
Sampedro et al.	2017	183.512	-63.593	–	–	–	–
Kharchenko et al.	2016	183.494	-63.586	–	–	–	–
Kharchenko et al.	2013	183.502	-63.59	–	-7.38	-0.61	–
Bukowiecki et al.	2011	183.508	-63.594	–	–	–	–
van den Bergh	2006	183.525	-63.6	–	–	–	–
Dias et al.	2002	183.512	-63.593	–	-4.98	0.59	–

💡 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–	6.19	3.91	–	1514	–	34	–	5
Cui et al.	2025	–	4.10	–	631	–	–	–	5⁽¹⁾
He et al.	2023	7.59	3.70	–	1585	–	–	–	–
Just et al.	2023	–	–	–	1514	–	34	–	–
Kharchenko et al.	2016	5.18	4.20	–	1514	–	–	–	–
Kharchenko et al.	2013	5.18	4.20	–	1514	–	–	–	–
Bukowiecki et al.	2011	9.96⁽¹⁾	2.84	–	1778	–	–	–	–
van den Bergh	2006	6.19	3.91	–	1514	–	–	–	–
Dias et al.	2002	6.19	3.91	–	1514	–	–	–	–

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

Visualization

ℹ️