Ruprecht 44

(MWSC 1398; OCL 681; ESO 430 05)

0.95 UTI

0.77

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 166

Stellar density (N₅₀/rad) 8.4 [N/pc²]

C3 classification AA

C_N 0.77 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 1.0 Very well-studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Ruprecht 44 is a rich, very dense object of very high C3 quality. Its parallax locates it at a large distance, above the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, very young cluster, but with a large variance across recent sources for the mass parameter (see Parameters). It is very well-studied in the literature.

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

Distant Moderate extinction Massive Near-solar metallicity Very young

Almeida et al. (2025)
Mass determination: good fit. Isochrone match: intermediate fit.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Ruprecht 44 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–	119.704	-28.558	0.176	-2.352	2.934	114.157
Li et al.	2025	119.708	-28.558	0.152	-2.381	2.935	–
Almeida et al.	2025	119.713	-28.569	–	–	–	–
Hunt & Reffert	2024	119.692	-28.547	0.181	-2.334	2.917	–
Celli et al.	2024	119.708	-28.558	–	–	–	–
Cavallo et al.	2024	119.697	-28.562	0.181	–	–	–
Hunt & Reffert	2023	119.692	-28.547	0.181	-2.334	2.917	–
Almeida et al.	2023	119.712	-28.569	–	–	–	–
Just et al.	2023	119.717	-28.583	–	–	–	–
Jaehnig et al.	2021	119.709	-28.563	0.183	-2.366	2.918	–
Rain et al.	2021	119.708	-28.558	0.152	-2.381	2.935	–
Dias et al.	2021	119.713	-28.569	0.156	-2.378	2.938	–
Cantat-Gaudin et al.	2020	119.708	-28.558	0.152	-2.381	2.935	–
Cantat-Gaudin & Anders	2020	119.708	-28.558	0.152	-2.381	2.935	–
Dias et al.	2019	119.713	-28.583	0.172	-2.338	2.843	64.017
Bossini et al.	2019	119.708	-28.558	–	–	–	–
Bica et al.	2019	119.711	-28.566	–	–	–	–
Cantat-Gaudin et al.	2018	119.708	-28.558	0.152	-2.381	2.935	–
Loktin & Popova	2017	119.715	-28.582	–	-2.618	-0.892	93.7
Kharchenko et al.	2016	119.717	-28.583	–	–	–	–
Dias et al.	2014	119.713	-28.583	–	-2.17	0.17	93.7
Kharchenko et al.	2013	119.722	-28.585	–	-1.58	1.02	–
Piskunov et al.	2008	119.707	-28.58	–	–	–	–
van den Bergh	2006	119.725	-28.583	–	–	–	–
Kharchenko et al.	2005	119.71	-28.58	–	-5.4	0.17	–
Dias et al.	2002	119.713	-28.583	–	-2.17	0.17	93.7
Dambis	1999	119.725	-28.583	–	–	–	–

💡 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–	4.67	1.9	1.87	14	-0.173	1171	0.57	0.0
Li et al.	2025	4.77	1.84	–	22	-0.056	–	–	–
Almeida et al.	2025	4.50	1.96	–	12	–	34	–	–
Hunt & Reffert	2024	–	–	–	–	–	1948⁽¹⁾	–	–
Celli et al.	2024	–	–	–	14	–	731	–	–
Cavallo et al.	2024	3.58	1.86	–	27	-0.290	–	–	–
Hunt & Reffert	2023	5.14	1.79	1.87	20	–	–	–	–
Almeida et al.	2023	4.14	1.97	–	16	-0.232	1171⁽¹⁾	0.57	–
Just et al.	2023	–	–	–	6	–	3698	–	–
Jaehnig et al.	2021	5.53⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	5.54	1.86	–	13	–	–	–	0
Dias et al.	2021	4.50	1.96	–	12	-0.115	–	–	–
Cantat-Gaudin et al.	2020	5.75	1.64	–	14	–	–	–	–
Cantat-Gaudin & Anders	2020	5.54	–	–	–	–	–	–	–
Dias et al.	2019	4.34	1.36	–	23	-0.642	–	–	–
Bossini et al.	2019	5.89	1.89	–	14	0.000	–	–	–
Cantat-Gaudin et al.	2018	5.54	–	–	–	–	–	–	–
Loktin & Popova	2017	4.64	1.91	–	9	–	–	–	–
Kharchenko et al.	2016	4.67	1.87	–	6	–	–	–	–
Kharchenko et al.	2013	4.67	1.87	–	6	–	–	–	–
Piskunov et al.	2008	4.66	1.92	–	21	–	–	–	–
van den Bergh	2006	4.73	1.92	–	9	–	–	–	–
Kharchenko et al.	2005	4.66	1.92	–	21	–	–	–	–
Dias et al.	2002	4.73	1.92	–	9	–	–	–	–
Dambis	1999	3.89	2.00	–	3	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
FoF 1429	9.6	119.42	-28.54	0.21	-2.31	2.89	76.8	0.41

💡 Note: The % column shows the percentage of members that Ruprecht 44 shares with each listed object.

Visualization

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