Chamaleon I

(MWSC 1897)

0.72 UTI

0.79

C_N

1.0

C_dens

1.0

C_C3

0.4

C_lit

1.0

C_dup

N₅₀ (P>50% members) 205

Stellar density (N₅₀/rad) 61.2 [N/pc²]

C3 classification AA

C_N 0.79 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.4 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Chamaleon I is a rich, very dense object of very high C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a low-mass, near-solar metallicity, very young cluster, but with a large variance across recent sources for the absorption and age parameters (see Parameters). It is poorly studied in the literature.

Note: This object shares a large percentage of members with 6 later reported entries. See table with shared members information.

Very close Low extinction Low mass Near-solar metallicity Very young

Liu et al. (2025)
Classified as primordial binary cluster 121 along with Theia_29, and as primordial binary cluster 231 along with HSC_2453, and of multiple system 41 along with Theia_29 and HSC_2453.

Palma et al. (2025)
Part of multiple system G243, along with Theia_29, HSC_2464, HSC_2458, HSC_2453 and HSC_2407.

Cavallo et al. (2024)
Silver sample.

Data

🔍 Search references for Chamaleon I 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–	167.162	-77.197	5.246	-22.534	0.286	13.923
Liu et al.	2025	167.12	-77.5	5.26	-22.56	0.44	15.56
Hunt & Reffert	2024	167.117	-77.499	5.261	-22.555	0.438	15.556
Cavallo et al.	2024	167.21	-76.927	5.268	–	–	–
Hunt & Reffert	2023	167.117	-77.499	5.261	-22.555	0.438	15.556
Just et al.	2023	165.892	-77.337	–	–	–	–
Kharchenko et al.	2016	165.892	-77.337	–	–	–	–
Kharchenko et al.	2013	165.9	-77.34	–	-6.5	8.89	–

💡 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–	0.3	0.97	2.27	4	0.370	46	–	–
Liu et al.	2025	0.30	0.55	–	10	–	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	80⁽¹⁾	–	–
Cavallo et al.	2024	0.20	2.89	–	8	0.370	–	–	–
Hunt & Reffert	2023	0.19	2.16	2.27	6	–	–	–	–
Just et al.	2023	–	–	–	1	–	11	–	–
Kharchenko et al.	2016	0.38	0.97	–	1	–	–	–	–
Kharchenko et al.	2013	0.38	0.97	–	1	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv
FoF 2435	99.5	167.16	-77.2	5.25	-22.53	0.28	13.92
OCSN 188	47.8	167.09	-77.49	5.29	-23.05	0.59	14.59
CWWDL 14679	41.0	167.44	-76.55	5.2	-22.07	-0.25	14.71
OC 0579	29.8	167.09	-77.56	5.27	-23.03	0.59	17.54
OCSN 187	27.3	167.49	-76.53	5.2	-21.84	-0.45	12.25
OC 0578	24.4	167.51	-76.51	5.19	-21.83	-0.52	12.25

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

Visualization

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