Bica 2

0.82 UTI

0.78

C_N

1.0

C_dens

1.0

C_C3

0.65

C_lit

1.0

C_dup

N₅₀ (P>50% members) 181

Stellar density (N₅₀/rad) 31.0 [N/pc²]

C3 classification AA

C_N 0.78 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.65 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Bica 2 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 a massive, near-solar metallicity, very young cluster, but with a large variance across recent sources for the metallicity and mass parameters (see Parameters). It is moderately studied in the literature.

Note: This object shares a small percentage of members with at least one entry reported in the same catalogue. See table with shared members information.

Relatively close High extinction Massive Near-solar metallicity Very young

Palma et al. (2025)
Part of multiple system G187, along with HSC_625 and OC_0128.

Cavallo et al. (2024)
Silver sample.

Almeida et al. (2025)
Mass determination: invalid due to poor quality CMD. Isochrone match: worst fit.

Data

🔍 Search references for Bica 2 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–	308.311	41.299	0.578	-2.684	-4.409	-13.559
Wei et al.	2025	308.173	41.219	0.581	-2.689	-4.334	–
Almeida et al.	2025	308.315	41.307	–	–	–	–
Hunt & Reffert	2024	308.319	41.301	0.576	-2.691	-4.413	6.897
Cavallo et al.	2024	308.311	41.302	0.577	–	–	–
Hunt & Reffert	2023	308.319	41.301	0.576	-2.691	-4.413	6.897
Almeida et al.	2023	308.317	41.306	–	–	–	–
Dias et al.	2021	308.315	41.307	0.555	-2.66	-4.378	–
Loktin & Popova	2017	308.31	41.313	–	-0.179	-0.551	-28.0
Dias et al.	2014	308.312	41.312	–	-0.49	-3.56	-28.0
Bukowiecki et al.	2011	308.333	41.298	–	–	–	–
Dias et al.	2002	308.312	41.312	–	-0.49	-3.56	-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–	1.67	4.71	2.99	6	0.300	1654	0.725	–
Wei et al.	2025	1.69	4.71	–	6	0.500	11328	0.59	–
Almeida et al.	2025	1.55	4.13	–	6	–	1072	–	–
Hunt & Reffert	2024	–	–	–	–	–	1654⁽¹⁾	–	–
Cavallo et al.	2024	1.69	4.71	–	5	0.520	–	–	–
Hunt & Reffert	2023	1.67	5.59	2.99	4	–	–	–	–
Almeida et al.	2023	1.59	4.49	–	5	0.059	2150⁽¹⁾	0.86	–
Dias et al.	2021	1.55	4.13	–	6	0.100	–	–	–
Loktin & Popova	2017	1.64	3.96	–	41	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	534	–	–
Bukowiecki et al.	2011	2.34⁽¹⁾	5.05	–	9	–	–	–	–
Dias et al.	2002	1.80	5.64	–	4	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
Cyg OB2	95.6	308.31	41.3	0.58	-2.72	-4.41	-8.19	0.17
FSR 0238	18.8	308.63	41.39	0.59	-2.84	-4.53	-27.33	0.88
FSR 0236	6.1	308.15	41.43	0.57	-2.41	-4.11	55.7	0.69
G 80.35+0.72	2.8	308.43	41.38	0.54	-2.83	-4.13	-4.79	0.16
OC 0129	2.8	308.06	41.46	0.58	-2.53	-4.04	57.08	0.25
OC 0128	0.6	307.98	40.8	0.58	-2.97	-4.4	38.32	0.67

💡 Note: The % column shows the percentage of members that Bica 2 shares with each listed object.

Visualization

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