Gaia 1

(Siriusly)

0.71 UTI

1.0

C_N

1.0

C_dens

0.75

C_C3

0.4

C_lit

1.0

C_dup

N₅₀ (P>50% members) 843

Stellar density (N₅₀/rad) 11.7 [N/pc²]

C3 classification AB

C_N 1.0 Very rich
C_dens 1.0 Very dense
C_C3 0.75 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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Gaia 1 is a very rich, very dense object of high C3 quality. Its parallax locates it at a large distance, well below the mid-plane, affected by moderate extinction. It is catalogued as a very massive, near-solar metallicity, old cluster (see Parameters). It is poorly studied in the literature.

Note: This object shares a small percentage of members with 3 later reported entries. See table with shared members information.

Very distant Moderate extinction Very massive Near-solar metallicity Old

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Gaia 1 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–	101.473	-16.735	0.168	-0.048	1.241	56.928
Hu & Soubiran	2025	101.471	-16.73	–	–	–	–
Hunt & Reffert	2024	101.467	-16.74	0.167	-0.041	1.229	59.565
Cavallo et al.	2024	101.471	-16.73	0.164	–	–	–
Hunt & Reffert	2023	101.467	-16.74	0.167	-0.041	1.229	59.565
Cantat-Gaudin et al.	2020	101.474	-16.733	0.145	-0.079	1.249	–
Cantat-Gaudin & Anders	2020	101.474	-16.733	0.145	-0.079	1.249	–
Bica et al.	2019	101.468	-16.753	–	–	–	–

💡 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–	5.31	1.39	2.09	3162	-0.295	6010	–	–
Hu & Soubiran	2025	–	–	–	–	-0.240⁽⁵⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	6010⁽¹⁾	–	–
Cavallo et al.	2024	4.37	1.39	–	3890	-0.350	–	–	–
Hunt & Reffert	2023	4.86	1.69	2.09	1330	–	–	–	–
Cantat-Gaudin et al.	2020	6.46	0.59	–	3162	–	–	–	–
Cantat-Gaudin & Anders	2020	5.76	–	–	–	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv
OC 0384	13.4	101.47	-16.73	0.17	-0.05	1.25	56.33
OC 0386	7.6	101.47	-16.75	0.18	-0.04	1.24	56.92
OC 0385	4.9	101.47	-16.75	0.19	-0.05	1.24	55.88

💡 Note: The % column shows the percentage of members that Gaia 1 shares with each listed object.

Visualization

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