Cyg OB2

0.15 UTI

0.8

C_N

1.0

C_dens

1.0

C_C3

0.13

C_lit

0.25

C_dup

N₅₀ (P>50% members) 231

Stellar density (N₅₀/rad) 45.4 [N/pc²]

C3 classification AA

C_N 0.8 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.13 Rarely studied
C_dup 0.25 Possibly duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Cyg OB2 is a rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by high extinction. It is catalogued as an extremely massive, very young cluster (see Parameters). It is rarely studied in the literature, with no articles listed in the last 8 years.

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

Relatively close High extinction Extremely massive Very young

Data

🔍 Search references for Cyg OB2 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–	308.307	41.3	0.58	-2.72	-4.407	-8.189
Dib et al.	2018	308.317	41.32	–	–	–	–
Joshi et al.	2016	308.317	41.32	–	–	–	–
Piskunov et al.	2008	308.299	41.304	–	–	–	–
Kharchenko et al.	2007	308.1	41.28	–	0.6	–	-28.0
Piskunov et al.	2007	308.299	41.304	–	–	–	–
Kharchenko et al.	2005	308.31	41.31	–	-1.6	-4.72	-28.0

💡 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–	1.5	4.1	–	5	–	25645	–	–
Dib et al.	2018	1.59	–	–	5	–	–	–	–
Joshi et al.	2016	1.59	5.78	–	5	–	30903	–	–
Piskunov et al.	2008	1.50	4.10	–	5	–	25645⁽¹⁾	–	–
Piskunov et al.	2007	1.50	4.10	–	5	–	3532	–	–
Kharchenko et al.	2005	1.50	4.10	–	5	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
Bica 2	74.9	308.31	41.3	0.58	-2.68	-4.41	-13.56	0.71
FSR 0238	19.0	308.63	41.39	0.59	-2.84	-4.53	-27.33	0.75
G80.35+0.72 IR Cl	4.8	308.42	41.38	0.54	-2.81	-4.12	-4.79	0.23
G 80.35+0.72	4.3	308.43	41.38	0.54	-2.83	-4.13	-4.79	0.04
FSR 0236	3.9	308.15	41.43	0.57	-2.41	-4.11	55.7	0.63
OC 0129	1.3	308.06	41.46	0.58	-2.53	-4.04	57.08	0.25
OC 0128	0.9	307.98	40.8	0.58	-2.97	-4.4	38.32	0.6

💡 Note: The % column shows the percentage of members that Cyg OB2 shares with each listed object.

Visualization

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