OC 0697

0.12 UTI

0.77

C_N

1.0

C_dens

1.0

C_C3

0.06

C_lit

0.2

C_dup

N_m (P>50%) 163

Core radius and density 1.6 [pc], 6.2 [pc^-2]

C3 classification AA

C_N 0.77 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.06 Rarely studied
C_dup 0.2 Likely duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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OC 0697 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by high extinction. It is catalogued as a very massive, near-solar metallicity, very young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is rarely studied in the literature.

⚠️ Warning: This is 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 Very massive Near-solar metallicity Very young

Palma et al. (2025)
Part of multiple system G51, along with UBC_565, Collinder_333, CWNU_2274 and UBC_566.

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.05 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.05 (50th percentile).

Data

🔍 Search references for OC 0697 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–	264.075	-33.498	0.399	-0.161	-1.303	-39.514
Hunt & Reffert	2024	264.06	-33.493	0.397	-0.177	-1.293	-27.856
Cavallo et al.	2024	264.074	-33.487	0.397	–	–	–
Hunt & Reffert	2023	264.06	-33.493	0.397	-0.177	-1.293	-27.856
Hao et al.	2022	264.074	-33.502	0.389	-0.19	-1.319	-19.895

💡 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–	2.31	4.3	2.85	7	0.037	5455	–	–
Hunt & Reffert	2024	2.31	4.30	2.85	7	–	5455⁽¹⁾	–	–
Cavallo et al.	2024	2.06	4.47	–	7	-0.190	–	–	–
Hunt & Reffert	2023	2.31	4.30	2.85	7	–	–	–	–
Hao et al.	2022	–	4.08	–	2	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
Trumpler 27	79.8	264.08	-33.5	0.4	-0.19	-1.28	-60.32	0.81

💡 Note: The % column shows the percentage of members that OC 0697 shares with each listed object.

Visualization

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