Upgren 1

0.19 UTI

0.0

C_N

0.71

C_dens

0.25

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 7

Stellar density (N₅₀/rad) 3.6 [N/pc²]

C3 classification BD

C_N 0.0 Sparse
C_dens 0.71 Moderately dense
C_C3 0.25 Low quality
C_lit 0.0 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Upgren 1 is a sparse, moderately dense object of low C3 quality. Its parallax locates it at a very close^* distance, above the mid-plane, affected by low extinction. It is catalogued as a cluster (see Parameters). It is rarely studied in the literature, with no articles listed in the last 39 years.

(*): The parallax distance estimate (~0.26 kpc) differs significantly from the median photometric distance (~0.14 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.

Very close Low extinction

Dias et al. (2002)
Asterism (Baumgardt, H. 1998, A&A 340, 402; Orellana, R. B.; De Biasi, M. S. 2008, RevMexAA 34, 111); cat V3.5 (Jan 2016)

Data

🔍 Search references for Upgren 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–	188.818	36.254	3.843	-40.167	-17.749	-7.371
Lynga	1987	188.758	36.311	–	–	–	–

💡 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–	0.14	0.25	–	–	–	–	–	–
Lynga	1987	0.14	0.25	–	–	–	–	–	–

Visualization

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