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1585 Union (1947 RG)
Classification:
Main-belt Asteroid
SPK-ID:
2001585
[
Ephemeris
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Orbit Diagram
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Orbital Elements
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Mission Design
|
Physical Parameters
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Discovery Circumstances
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[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference:
JPL 49
(heliocentric ecliptic J2000)
Element
Value
Uncertainty (1-sigma)
Units
e
.3091282831010794
2.7351e-08
a
2.926698949445004
9.4194e-09
au
q
2.021973528049337
7.988e-08
au
i
26.19044941350894
4.1132e-06
deg
node
150.094252962419
7.8057e-06
deg
peri
264.385260279582
1.113e-05
deg
M
180.6633317530211
9.9442e-06
deg
t
p
2460111.528788095168
(2023-Jun-16.02878810)
5.3248e-05
TDB
period
1828.79701580374
5.01
8.8288e-06
2.417e-08
d
yr
n
.1968507149175237
9.5033e-10
deg/d
Q
3.831424370840671
1.2331e-08
au
Orbit Determination Parameters
# obs. used (total)
3004
data-arc span
29915 days (81.90 yr)
first obs. used
1939-02-21
last obs. used
2021-01-16
planetary ephem.
DE431
SB-pert. ephem.
SB431-N16
condition code
0
norm. resid. RMS
.42313
source
ORB
producer
Otto Matic
solution date
2021-Feb-24 19:04:41
Additional Information
Earth MOID
= 1.20528 au
Jupiter MOID
= 2.26351 au
T_jup
= 3.058
[ show covariance matrix ]
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Physical Parameter Table
Parameter
Symbol
Value
Units
Sigma
Reference
Notes
absolute magnitude
H
10.37
n/a
E2021B10
IRAS observations used: 6
diameter
diameter
55.271
km
0.243
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)
rotation period
rot_per
12.798
h
n/a
LCDB (Rev. 2020-October); Warner et al., 2009
Published Reference List:
[Polakis, T. (2019) Minor Planet Bull. 46, 287-292.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo
albedo
0.031
0.004
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)
B-V
BV
0.590
0.020
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2
#obs=1; phase=8.56 deg.
U-B
UB
0.290
0.030
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2
#obs=1; phase=8.56 deg.
1585 Union (1947 RG)
Discovered 1947-Sep-07 by Johnson, E. L. at Johannesburg (UO)
Reference:
DISCOVERY.DB
Last Updated:
2003-08-29
Alternate Designations
1947 RG
= 1929 DB = 1937 QF = 1939 CD1 = 1944 DG = 1949 EE = 1952 QA1 = 1952 SD
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2021-Mar-06 11:55 UT
(server date/time)
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