Cir OB1

0.04 UTI

0.0

C_N

0.07

C_dens

0.12

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 13

Stellar density (N₅₀/rad) 0.3 [N/pc²]

C3 classification DC

C_N 0.0 Sparse
C_dens 0.07 Very loose
C_C3 0.12 Very low quality
C_lit 0.0 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Cir OB1 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a moderate^* distance, below the mid-plane, affected by very high extinction. It is catalogued as a very young cluster (see Parameters). It is rarely studied in the literature, with no articles listed in the last 8 years.

(*): The parallax distance estimate (~3.53 kpc) differs significantly from the median photometric distance (~1.78 kpc).

⚠️ 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 Very high extinction Very young

Data

🔍 Search references for Cir OB1 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–	221.15	-62.917	0.283	-6.122	-3.639	-51.039
Dib et al.	2018	221.25	-62.925	–	–	–	–
Joshi et al.	2016	221.25	-62.925	–	–	–	–

💡 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–	1.78	7.29	–	6	–	–	–	–
Dib et al.	2018	1.78	–	–	6	–	–	–	–
Joshi et al.	2016	1.78	7.29	–	6	–	–	–	–

Visualization

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