FSR 0251

(MWSC 3391)

0.57 UTI

0.44

C_N

1.0

C_dens

0.5

C_C3

0.45

C_lit

1.0

C_dup

N₅₀ (P>50% members) 44

Stellar density (N₅₀/rad) 32.3 [N/pc²]

C3 classification BB

C_N 0.44 Poorly populated
C_dens 1.0 Very dense
C_C3 0.5 Intermediate quality
C_lit 0.45 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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FSR 0251 is a poorly populated, very dense object of intermediate C3 quality. Its parallax locates it at a relatively close^* distance, near the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and mass parameters (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~1.60 kpc) differs significantly from the median photometric distance (~0.86 kpc).

Note: This object shares a significant percentage of members with a later reported entry. See table with shared members information.

Close High extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as genetic pair P213, along with HSC_640.

Cavallo et al. (2024)
Wood sample.

Data

🔍 Search references for FSR 0251 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–	310.013	42.971	0.624	-2.508	-3.62	-29.084
Hunt & Reffert	2024	310.001	42.967	0.626	-2.52	-3.616	-29.074
Cavallo et al.	2024	309.955	42.98	0.623	–	–	–
Hunt & Reffert	2023	310.001	42.967	0.626	-2.52	-3.616	-29.074
Just et al.	2023	310.097	42.947	–	–	–	–
Kharchenko et al.	2016	310.097	42.947	–	–	–	–
Kharchenko et al.	2013	310.102	42.95	–	-1.77	-3.28	–
Froebrich et al.	2007	310.058	42.976	–	–	–	–
Dias et al.	2002	310.058	42.976	–	-1.77	-3.28	–

💡 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–	0.86	3.23	2.85	501	0.040	166	–	–
Hunt & Reffert	2024	–	–	–	–	–	313⁽¹⁾	–	–
Cavallo et al.	2024	2.01	4.92	–	19	0.040	–	–	–
Hunt & Reffert	2023	1.51	5.21	2.85	11	–	–	–	–
Just et al.	2023	–	–	–	501	–	19	–	–
Kharchenko et al.	2016	0.86	3.23	–	501	–	–	–	–
Kharchenko et al.	2013	0.86	3.23	–	501	–	–	–	–
Dias et al.	2002	0.86	3.23	–	501	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OC 0132	56.8	310.01	42.97	0.65	-2.5	-3.64	-29.08	0.0

💡 Note: The % column shows the percentage of members that FSR 0251 shares with each listed object.

Visualization

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