NGC 5998

0.08 UTI

0.0

C_N

0.03

C_dens

0.25

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 22

Core radius and density 3.4 [pc], 0.2 [pc^-2]

C3 classification CC

C_N 0.0 Sparse
C_dens 0.03 Very loose
C_C3 0.25 Low quality
C_lit 0.06 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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NGC 5998 is a sparse, very loose object of low C3 quality. Its parallax locates it at a large^* distance, well above the mid-plane, affected by low extinction. It is catalogued as an old cluster (see Parameters). It is rarely studied in the literature, with no articles listed in the last 9 years.

(*): The parallax distance estimate (~5.79 kpc) differs significantly from the median photometric distance (~1.07 kpc).

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Relatively close Low extinction Old

Cantat-Gaudin & Anders (2020)
Non-existent per Revised NGC. Catalogue distances vary widely; no clear observational confirmation. More details in Appendix A of the article.

Data

🔍 Search references for NGC 5998 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–	237.353	-28.577	0.173	-5.416	-3.198	-4.271
Sampedro et al.	2017	237.392	-28.588	–	-3.96	-1.09	–
Tadross	2014	237.392	-28.588	–	–	–	–
Dias et al.	2014	237.392	-28.588	–	-3.07	-0.98	–
Dias et al.	2002	237.392	-28.588	–	-3.58	-0.89	–

💡 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–	1.075	0.345	–	1892	–	–	–	–
Tadross	2014	0.98	0.50	–	2200	–	–	–	–
Dias et al.	2002	1.17	0.19	–	1585	–	–	–	–

Visualization

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