OC 0681

0.04 UTI

0.43

C_N

0.67

C_dens

0.75

C_C3

0.06

C_lit

0.09

C_dup

N_m (P>50%) 43

Core radius and density 1.4 [pc], 3.4 [pc^-2]

C3 classification BA

C_N 0.43 Poorly populated
C_dens 0.67 Moderately dense
C_C3 0.75 High quality
C_lit 0.06 Rarely studied
C_dup 0.09 Very likely duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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OC 0681 is a poorly populated, moderately dense object of high 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, young cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is rarely studied in the literature.

⚠️ Warning: This is very likely a duplicate object, which shares a large percentage of members with at least one previously reported entry. See table with shared members information.

Relatively close High extinction Near-solar metallicity Young

Palma et al. (2025)
Part of multiple system G169, along with CWNU_1279 and HSC_2894.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.74 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.74 (50th percentile).

Data

🔍 Search references for OC 0681 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–	259.829	-39.063	0.58	0.987	-1.135	–
Hunt & Reffert	2024	259.859	-39.058	0.569	0.96	-1.137	–
Cavallo et al.	2024	259.844	-39.07	0.575	–	–	–
Hunt & Reffert	2023	259.859	-39.058	0.569	0.96	-1.137	–
Hao et al.	2022	259.813	-39.054	0.58	1.002	-1.108	–

💡 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–	1.62	3.36	2.79	26	0.087	805	–	–
Hunt & Reffert	2024	1.62	3.06	2.79	26	–	805⁽¹⁾	–	–
Cavallo et al.	2024	1.71	3.66	–	12	-0.090	–	–	–
Hunt & Reffert	2023	1.62	3.06	2.79	26	–	–	–	–
Hao et al.	2022	–	4.94	–	158	0.265	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 4	100.0	259.85	-39.07	0.59	0.99	-1.14	–	0.14
CWWDL 13634	97.7	259.84	-39.06	0.59	0.99	-1.13	–	0.03
VVV 100	90.7	259.83	-39.06	0.58	0.99	-1.13	–	0.37

💡 Note: The % column shows the percentage of members that OC 0681 shares with each listed object.

Visualization

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