Pfleiderer 4

(MWSC 3764; PWM 4)

0.53 UTI

0.75

C_N

0.36

C_dens

0.75

C_C3

0.39

C_lit

1.0

C_dup

N_m (P>50%) 109

Core radius and density 2.9 [pc], 1.8 [pc^-2]

C3 classification AB

C_N 0.75 Rich
C_dens 0.36 Loose
C_C3 0.75 High quality
C_lit 0.39 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Pfleiderer 4 is a rich, loose object of high C3 quality. Its parallax locates it at a very large distance, above the mid-plane, affected by moderate extinction. It is catalogued as a massive, old cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is poorly studied in the literature.

Note: This object contains blue stragglers according to at least one source.

Very distant Moderate extinction Massive Old Contains BSS

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.90 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.90 (50th percentile).

Data

🔍 Search references for Pfleiderer 4 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–	357.722	62.317	0.097	-1.332	-0.497	-94.445
Cui et al.	2025	357.722	62.319	0.12	-1.3	-0.5	–
Hunt & Reffert	2024	357.734	62.318	0.043	-1.342	-0.486	–
He et al.	2023	357.721	62.319	0.118	-1.304	-0.503	-121.01
Hunt & Reffert	2023	357.734	62.318	0.043	-1.342	-0.486	–
Just et al.	2023	357.719	62.316	–	–	–	–
Bica et al.	2019	357.713	62.319	–	–	–	–
Loktin & Popova	2017	357.72	62.316	–	1.638	-5.62	-125.9
Sampedro et al.	2017	357.729	62.321	–	2.11	5.25	–
Kharchenko et al.	2016	357.719	62.316	–	–	–	–
Dias et al.	2014	357.729	62.321	–	2.84	5.67	–
Kharchenko et al.	2013	357.727	62.32	–	1.6	-5.53	-125.9
Kharchenko et al.	2012	357.79	62.315	–	1.52	-5.21	–
Bukowiecki et al.	2011	357.733	62.313	–	–	–	–
Dias et al.	2002	357.729	62.321	–	2.84	5.67	–

💡 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–	7.72	2.605	1.12	2818	–	2995	–	15
Cui et al.	2025	–	2.68	–	2818	–	–	–	15⁽¹⁾
Hunt & Reffert	2024	13.13	3.71	1.12	452	–	2188⁽¹⁾	–	–
He et al.	2023	7.08	2.95	–	1585	–	–	–	–
Hunt & Reffert	2023	13.13	3.71	1.12	452	–	–	–	–
Just et al.	2023	–	–	–	4467	–	3802	–	–
Loktin & Popova	2017	2.97	1.64	–	380	–	–	–	–
Kharchenko et al.	2016	7.72	2.56	–	4467	–	–	–	–
Kharchenko et al.	2013	7.72	2.56	–	4467	–	–	–	–
Kharchenko et al.	2012	8.00	2.52	–	6310	–	–	–	–
Bukowiecki et al.	2011	7.28⁽¹⁾	2.65	–	1585	–	–	–	–
Dias et al.	2002	7.90	1.96	–	6310	–	–	–	–

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

Visualization

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