Cep OB3

0.14 UTI

0.31

C_N

0.13

C_dens

0.25

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 31

Stellar density (N₅₀/rad) 0.6 [N/pc²]

C3 classification CC

C_N 0.31 Poorly populated
C_dens 0.13 Very loose
C_C3 0.25 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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Cep OB3 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a moderate^* distance, above the mid-plane, affected by moderate extinction. It is catalogued as a very massive, young cluster (see Parameters). It is rarely studied in the literature, with no articles listed in the last 18 years.

(*): The parallax distance estimate (~3.66 kpc) differs significantly from the median photometric distance (~0.70 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.

Close Moderate extinction Very massive Young

Data

🔍 Search references for Cep OB3 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–	346.089	63.341	0.273	-3.421	-1.161	-90.83
Piskunov et al.	2008	346.044	63.395	–	–	–	–
Piskunov et al.	2007	346.044	63.395	–	–	–	–
Kharchenko et al.	2005	346.05	63.4	–	-1.46	-1.98	-15.12

💡 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–	0.7	1.71	–	28	–	7888	–	–
Piskunov et al.	2008	0.70	1.71	–	28	–	11803⁽¹⁾	–	–
Piskunov et al.	2007	0.70	1.71	–	28	–	3972	–	–
Kharchenko et al.	2005	0.70	1.71	–	28	–	–	–	–

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

Visualization

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