HXHWL 21

0.46 UTI

0.35

C_N

0.58

C_dens

0.75

C_C3

0.3

C_lit

1.0

C_dup

N₅₀ (P>50% members) 35

Stellar density (N₅₀/rad) 2.9 [N/pc²]

C3 classification AB

C_N 0.35 Poorly populated
C_dens 0.58 Moderately dense
C_C3 0.75 High quality
C_lit 0.3 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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HXHWL 21 is a poorly populated, moderately dense object of high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is poorly studied in the literature.

Relatively close Low extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as optical pair P339, along with CWNU_2016.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for HXHWL 21 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–	111.346	-8.837	0.471	-0.78	-0.826	54.053
Hu & Soubiran	2025	111.349	-8.842	–	–	–	–
Hunt & Reffert	2024	111.333	-8.783	0.464	-0.811	-0.814	37.053
Cavallo et al.	2024	111.349	-8.842	0.465	–	–	–
Hunt & Reffert	2023	111.333	-8.783	0.464	-0.811	-0.814	37.053
He et al.	2021	111.36	-8.852	0.46	-0.8	-0.87	–

💡 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–	2.0	0.18	0.6	802	0.110	155	–	–
Hu & Soubiran	2025	–	–	–	–	-0.160⁽⁵⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	155⁽¹⁾	–	–
Cavallo et al.	2024	2.01	0.47	–	631	0.110	–	–	–
Hunt & Reffert	2023	2.00	0.18	0.60	802	–	–	–	–
He et al.	2021	1.66	0.12	–	1047	0.223	–	–	–

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

Visualization

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