OC 0030

0.18 UTI

0.28

C_N

0.26

C_dens

0.25

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 28

Core radius and density 1.6 [pc], 1.3 [pc^-2]

C3 classification DB

C_N 0.28 Poorly populated
C_dens 0.26 Loose
C_C3 0.25 Low quality
C_lit 0.06 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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OC 0030 is a poorly populated, loose object of low C3 quality. Its parallax locates it at a relatively close distance, above 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 parameter (see Parameters). It is rarely studied in the literature.

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

⚠️ 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.

Relatively close High extinction Near-solar metallicity Young

Palma et al. (2025)
Classified as optical pair P557, along with Trumpler_32.

Cavallo et al. (2024)
Wood sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.51 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.51 (50th percentile).

Data

🔍 Search references for OC 0030 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–	273.796	-12.549	0.58	-0.409	-0.845	-26.789
Hunt & Reffert	2024	273.796	-12.551	0.582	-0.412	-0.857	-26.801
Cavallo et al.	2024	273.794	-12.577	0.584	–	–	–
Hunt & Reffert	2023	273.796	-12.551	0.582	-0.412	-0.857	-26.801
Hao et al.	2022	273.801	-12.56	0.606	-0.473	-0.794	–

💡 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	3.51	2.17	77	0.233	337	–	–
Hunt & Reffert	2024	1.62	3.51	2.17	77	–	337⁽¹⁾	–	–
Cavallo et al.	2024	2.22	2.91	–	117	0.200	–	–	–
Hunt & Reffert	2023	1.62	3.51	2.17	77	–	–	–	–
Hao et al.	2022	–	3.60	–	13	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 493	82.1	273.8	-12.56	0.58	-0.4	-0.86	-26.79	0.01

💡 Note: The % column shows the percentage of members that OC 0030 shares with each listed object.

Visualization

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