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
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
18381 Massenet (1991 YU)
Classification: Main-belt Asteroid          SPK-ID: 2018381
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1435232031345844 3.089e-08  
a 2.799462549417205 1.3998e-08 au
q 2.397674717269538 8.7978e-08 au
i 6.637120068106099 4.2852e-06 deg
node 138.0731909909418 3.6722e-05 deg
peri 324.7618702236253 4.0982e-05 deg
M 22.84080772836438 1.7496e-05 deg
tp 2458891.952612088788
(2020-Feb-12.45261209)
8.3051e-05 TDB
period 1710.844034622709
4.68
1.2832e-05
3.513e-08
d
yr
n .2104224538967928 1.5782e-09 deg/d
Q 3.201250381564872 1.6007e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1787  
   data-arc span      10762 days (29.46 yr)  
   first obs. used      1990-08-16  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48513  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 22:25:00  

Additional Information
 Earth MOID = 1.41805 au 
 Jupiter MOID = 1.94016 au 
 T_jup = 3.301 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456785.5 (2014-May-08.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1422005053269865 3.1105e-08  
q 2.401245377691487 8.849e-08 au
tp 2457184.240399053282
(2015-Jun-10.74039905)
8.3244e-05 TDB
node 138.1193554299144 3.6686e-05 deg
peri 325.3597483305116 4.099e-05 deg
i 6.639276090324327 4.287e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1787  
   data-arc span      10762 days (29.46 yr)  
   first obs. used      1990-08-16  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48513  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 22:25:00  

Additional Information
 Jupiter MOID = 1.94016 au 
 T_jup = 3.301 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.675046909683508E-16 -2.727040540905235E-15 2.733183983664524E-13 -7.515882011229784E-16 5.376202964564009E-14 -9.102668058631291E-16
q -2.727040540905235E-15 7.830408488196349E-15 -8.307546192457944E-13 2.429379278177363E-15 -1.737807707645926E-13 2.765116829049122E-15
tp 2.733183983664524E-13 -8.307546192457944E-13 6.929564341893293E-9 2.859772853916493E-11 1.543995904149205E-9 5.154837217487118E-13
node -7.515882011229784E-16 2.429379278177363E-15 2.859772853916493E-11 1.345858654007202E-9 -1.329956570143677E-9 4.687584793450923E-11
peri 5.376202964564009E-14 -1.737807707645926E-13 1.543995904149205E-9 -1.329956570143677E-9 1.680199226135423E-9 -4.647080849364822E-11
i -9.102668058631291E-16 2.765116829049122E-15 5.154837217487118E-13 4.687584793450923E-11 -4.647080849364822E-11 1.837830916051084E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.2   n/a MPO416905  
diameter diameter 8.758 km 0.236 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.145   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

18381 Massenet           Discovered 1991 Dec. 30 by E. W. Elst at Haute Provence.
Jules Massenet (1842-1912) was a prolific French composer of operas. His greatest successes were Manon (1884), Werther (1892) and Thaïs (1894). The Méditation, a violin solo with orchestra from Thaïs, became world famous. In 1878 he was elected a member of the Académie des Beaux-Arts.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20100726/MPCPages.arcLast Updated: 2010-07-28

[ show close-approach data ]
Alternate Designations
 1991 YU = 1990 QB11 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Feb-27 08:57 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin