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1272 Gefion (1931 TZ1)
Classification:
Main-belt Asteroid
SPK-ID:
2001272
[
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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Close-Approach Data
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[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference:
JPL 33
(heliocentric ecliptic J2000)
Element
Value
Uncertainty (1-sigma)
Units
e
.1505442091012239
4.2088e-08
a
2.784346916873382
1.0764e-08
au
q
2.365179612409248
1.1696e-07
au
i
8.415794065562105
4.5196e-06
deg
node
321.4117743582179
2.3098e-05
deg
peri
3.780094920906182
2.6052e-05
deg
M
67.40667707404742
1.0869e-05
deg
t
p
2458682.751241321281
(2019-Jul-18.25124132)
5.1413e-05
TDB
period
1697.006262431242
4.65
9.8402e-06
2.694e-08
d
yr
n
.2121382860922626
1.2301e-09
deg/d
Q
3.203514221337517
1.2384e-08
au
Orbit Determination Parameters
# obs. used (total)
2209
data-arc span
37654 days (103.09 yr)
first obs. used
1917-09-26
last obs. used
2020-10-29
planetary ephem.
DE431
SB-pert. ephem.
SB431-N16
condition code
0
norm. resid. RMS
.47423
source
ORB
producer
Otto Matic
solution date
2020-Nov-13 04:20:44
Additional Information
Earth MOID
= 1.35323 au
Jupiter MOID
= 2.1261 au
T_jup
= 3.300
[ show covariance matrix ]
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Orbital Elements
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Physical Parameter Table
Parameter
Symbol
Value
Units
Sigma
Reference
Notes
absolute magnitude
H
12.9
n/a
MPO435707
diameter
diameter
6.965
km
0.169
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)
rotation period
rot_per
3.086
h
n/a
LCDB (Rev. 2020-October); Warner et al., 2009
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Benishek, V. (2020) Minor Planet Bull. 47, 75-83.]
geometric albedo
albedo
0.252
0.041
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)
SMASSII spectral type
spec_B
Sl
n/a
EAR-A-5-DDR-TAXONOMY-V4.0
based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)
1272 Gefion (1931 TZ1)
Discovered 1931-Oct-10 by Reinmuth, K. at Heidelberg
Reference:
DISCOVERY.DB
Last Updated:
2003-08-29
[ show close-approach data ]
Alternate Designations
1931 TZ1
= A917 SF
[
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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Close-Approach Data
]
2021-Jan-28 11:14 UT
(server date/time)
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