Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
1990 Pilcher (1956 EE)
Classification: Main-belt Asteroid          SPK-ID: 2001990
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ hide orbit diagram ]

For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0507891814655256 1.7377e-08  
a 2.17389639395773 4.2992e-09 au
q 2.063485975517759 3.8239e-08 au
i 3.131890482507119 9.8516e-07 deg
node 193.6189460740935 1.1481e-05 deg
peri 12.35528772384311 1.571e-05 deg
M 39.9627414312388 1.4646e-05 deg
tp 2459070.540071914978
(2020-Aug-09.04007191)
4.7528e-05 TDB
period 1170.729845726641
3.21
3.4729e-06
9.508e-09
d
yr
n .3075004889591394 9.1219e-10 deg/d
Q 2.284306812397701 4.5176e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3308  
   data-arc span      30636 days (83.88 yr)  
   first obs. used      1937-05-03  
   last obs. used      2021-03-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40091  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:54:26  

Additional Information
 Earth MOID = 1.05785 au 
 Jupiter MOID = 2.67209 au 
 T_jup = 3.683 
[ 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 12.96   n/a E2021B10  
diameter diameter 6.754 km 0.167 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 2.842 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:
[Brincat, S.M. (2017) Minor Planet Bull. 44, 1-2.]
geometric albedo albedo 0.215   0.039 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.850   0.036 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=2.05, mean=2.80, max.=3.55) deg.
U-B UB 0.504   0.073 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=2.05, mean=2.80, max.=3.55) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices

1990 Pilcher (1956 EE)          Discovered 1956-Mar-09 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1956 EE = 1937 JL = 1940 FA = 1959 CE1 = 1964 VS2 = 1972 EC = 1972 GO = 1973 QM 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-May-08 02:43 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin