+ View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Small-Body Database Browser
Search:
[
help
]
1657 Roemera (1961 EA)
Classification:
Main-belt Asteroid
SPK-ID:
2001657
[
Ephemeris
|
Orbit Diagram
|
Orbital Elements
|
Mission Design
|
Physical Parameters
|
Discovery Circumstances
]
[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference:
JPL 32
(heliocentric ecliptic J2000)
Element
Value
Uncertainty (1-sigma)
Units
e
.2373136319102141
3.6572e-08
a
2.347372022775341
7.3952e-09
au
q
1.790308642606099
8.4774e-08
au
i
23.38298749309499
4.3054e-06
deg
node
105.3068708523852
1.0007e-05
deg
peri
54.42360048243458
1.3162e-05
deg
M
221.8959070930752
1.0474e-05
deg
t
p
2459704.435973942347
(2022-May-04.93597394)
3.9584e-05
TDB
period
1313.624721763394
3.60
6.2077e-06
1.7e-08
d
yr
n
.274050871634587
1.2951e-09
deg/d
Q
2.904435402944583
9.1502e-09
au
Orbit Determination Parameters
# obs. used (total)
1954
data-arc span
32513 days (89.02 yr)
first obs. used
1932-01-10
last obs. used
2021-01-15
planetary ephem.
DE431
SB-pert. ephem.
SB431-N16
condition code
0
norm. resid. RMS
.38026
source
ORB
producer
Otto Matic
solution date
2021-Feb-24 00:57:09
Additional Information
Earth MOID
= .877538 au
Jupiter MOID
= 2.34313 au
T_jup
= 3.414
[ show covariance matrix ]
[
Ephemeris
|
Orbit Diagram
|
Orbital Elements
|
Mission Design
|
Physical Parameters
|
Discovery Circumstances
]
Physical Parameter Table
Parameter
Symbol
Value
Units
Sigma
Reference
Notes
absolute magnitude
H
12.82
n/a
E2021B10
diameter
diameter
7.665
km
0.219
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)
rotation period
rot_per
34.0
h
n/a
LCDB (Rev. 2020-October); Warner et al., 2009
Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Warner, B.D. (2009) Minor Planet Bull. 36, 7-13.]
geometric albedo
albedo
0.220
0.030
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)
Tholen spectral type
spec_T
S
n/a
EAR-A-5-DDR-TAXONOMY-V4.0
used 7 color indices
1657 Roemera (1961 EA)
Discovered 1961-Mar-06 by Wild, P. at Zimmerwald
Reference:
DISCOVERY.DB
Last Updated:
2003-08-29
Alternate Designations
1961 EA
= 1932 AB
[
Ephemeris
|
Orbit Diagram
|
Orbital Elements
|
Mission Design
|
Physical Parameters
|
Discovery Circumstances
]
2021-Mar-05 14:08 UT
(server date/time)
Site Manager:
Ryan S. Park
Webmaster
:
Alan B. Chamberlin