Grasdalen 1

(rho Oph; rho Oph Dark Cloud; OCl-1015.1)

0.45 UTI

0.25

C_N

1.0

C_dens

0.62

C_C3

0.19

C_lit

1.0

C_dup

N_m (P>50%) 25

Core radius and density 0.3 [pc], 37 [pc^-2]

C3 classification AC

C_N 0.25 Poorly populated
C_dens 1.0 Very dense
C_C3 0.62 Intermediate quality
C_lit 0.19 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Grasdalen 1 is a poorly populated, very dense object of intermediate C3 quality. Its parallax locates it at a very close^* distance, above the mid-plane, affected by very high extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It is rarely studied in the literature.

(*): The parallax distance estimate (~0.14 kpc) differs significantly from the median photometric distance (~0.94 kpc).

Note: This object shares a large percentage of members with 2 later reported entries. See table with shared members information.

Close Very high extinction Near-solar metallicity Young

Bica et al. (2003)
Classified as infrared cluster (IRC).

Lada & Lada (2003)
Embedded cluster within ∼2 Kpc of the Sun.

Dias et al. (2002)
IR-only cluster (Archinal, B. A. & Hynes, S. J. 2003); cat V3.5 (Jan 2016)

Data

🔍 Search references for Grasdalen 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–	246.769	-24.654	7.256	-6.466	-26.022	-8.147
Joshi et al.	2016	245.917	-24.455	–	–	–	–
Lada & Lada	2003	246.757	-24.611	–	–	–	–
Bica et al.	2003	246.594	-24.402	–	–	–	–
Lynga	1987	246.492	-24.448	–	–	–	–

💡 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–	0.94	6.57	–	79	-0.106	53	–	–
Spina et al.	2022	–	–	–	–	-0.106	–	–	–
Joshi et al.	2016	1.76	6.57	–	79	–	–	–	–
Lada & Lada	2003	0.12	–	–	–	–	53	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OCSN 245	100.0	246.4	-24.04	7.2	-7.05	-25.65	-7.74	0.53
HSC 2919	88.0	246.54	-24.02	7.21	-6.81	-25.98	-8.44	0.0

💡 Note: The % column shows the percentage of members that Grasdalen 1 shares with each listed object.

Visualization

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