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989 Schwassmannia (A922 WD)
Classification:
Main-belt Asteroid
SPK-ID:
2000989
[
Ephemeris
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Orbit Diagram
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Orbital Elements
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Mission Design
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Physical Parameters
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Discovery Circumstances
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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference:
JPL 36
(heliocentric ecliptic J2000)
Element
Value
Uncertainty (1-sigma)
Units
e
.2506811227357891
3.3795e-08
a
2.659105182750108
8.1706e-09
au
q
1.992517710065755
8.9821e-08
au
i
14.69719946950214
3.6672e-06
deg
node
243.3974468709455
1.694e-05
deg
peri
165.6272947406541
1.8767e-05
deg
M
220.4036076665303
1.0022e-05
deg
t
p
2459814.648500137990
(2022-Aug-23.14850014)
4.5802e-05
TDB
period
1583.80497055773
4.34
7.2998e-06
1.999e-08
d
yr
n
.2273007135930553
1.0476e-09
deg/d
Q
3.32569265543446
1.0219e-08
au
Orbit Determination Parameters
# obs. used (total)
2556
data-arc span
35713 days (97.78 yr)
first obs. used
1922-11-12
last obs. used
2020-08-22
planetary ephem.
DE431
SB-pert. ephem.
SB431-N16
condition code
0
norm. resid. RMS
.37887
source
ORB
producer
Otto Matic
solution date
2020-Nov-13 04:23:39
Additional Information
Earth MOID
= 1.00593 au
Jupiter MOID
= 2.07007 au
T_jup
= 3.296
[ show covariance matrix ]
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Physical Parameter Table
Parameter
Symbol
Value
Units
Sigma
Reference
Notes
absolute magnitude
H
11.93
n/a
E2021B10
diameter
diameter
12.630
km
0.124
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)
rotation period
rot_per
107.85
h
n/a
LCDB (Rev. 2020-October); Warner et al., 2009
Published Reference List:
[Benishek, V.; Pilcher, F.; Martinez, L. (2014) Minor Planet Bull. 41, 133.]
geometric albedo
albedo
0.306
0.064
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)
989 Schwassmannia (A922 WD)
Discovered 1922-Nov-18 by Schwassmann, A. at Bergedorf
Reference:
DISCOVERY.DB
Last Updated:
2003-08-29
Alternate Designations
A922 WD
= 1935 UE = 1935 UF
[
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2021-Mar-09 05:24 UT
(server date/time)
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