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18 Melpomene (A852 MA)
Classification: Main-belt Asteroid          SPK-ID: 2000018
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 109 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2175053246209367 2.9243e-08  
a 2.295708701267524 2.2794e-09 au
q 1.796379834963223 6.6931e-08 au
i 10.1315904948773 3.5548e-06 deg
node 150.3651857267417 1.9113e-05 deg
peri 228.0776830537478 2.0795e-05 deg
M 20.46210043542977 9.4932e-06 deg
tp 2458928.286015474634
(2020-Mar-19.78601547)
3.345e-05 TDB
period 1270.496863758834
3.48
1.8922e-06
5.181e-09
d
yr
n .2833537100870289 4.2201e-10 deg/d
Q 2.795037567571826 2.7752e-09 au
  Orbit Determination Parameters
   # obs. used (total)      5174  
   data-arc span      61483 days (168.33 yr)  
   first obs. used      1852-06-29  
   last obs. used      2020-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43543  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:34:20  

Additional Information
 Earth MOID = .813814 au 
 Jupiter MOID = 2.69803 au 
 T_jup = 3.543 
[ hide covariance matrix ]
Orbital Elements at Epoch 2450565.5 (1997-Apr-27.0) TDB
Reference: JPL 109 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2177410754543482 2.9163e-08  
q 1.795848750392275 6.6756e-08 au
tp 2450034.200722099878
(1995-Nov-12.70072210)
2.9407e-05 TDB
node 150.5890982182804 1.911e-05 deg
peri 227.7748138593477 2.0802e-05 deg
i 10.13009374755729 3.5561e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      5174  
   data-arc span      61483 days (168.33 yr)  
   first obs. used      1852-06-29  
   last obs. used      2020-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43543  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:34:20  

Additional Information
 Jupiter MOID = 2.69803 au 
 T_jup = 3.543 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.505070109259954E-16 -1.946149045617182E-15 -5.248283249205262E-14 3.981894393261327E-15 -2.132154670097381E-14 8.259311093287942E-16
q -1.946149045617182E-15 4.456414327588509E-15 1.244815933165383E-13 -8.962547594940665E-15 4.965663513612114E-14 -1.844807918701247E-15
tp -5.248283249205262E-14 1.244815933165383E-13 8.647774508714429E-10 -6.35942475506129E-12 2.522660457608291E-10 -6.989062724159626E-14
node 3.981894393261327E-15 -8.962547594940665E-15 -6.35942475506129E-12 3.65199106235387E-10 -3.607333973983088E-10 -3.317483797262165E-12
peri -2.132154670097381E-14 4.965663513612114E-14 2.522660457608291E-10 -3.607333973983088E-10 4.327334203611084E-10 3.280072472233627E-12
i 8.259311093287942E-16 -1.844807918701247E-15 -6.989062724159626E-14 -3.317483797262165E-12 3.280072472233627E-12 1.264589759523572E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 6.6   n/a MPO492748 IRAS observations used: 15
magnitude slope G 0.25   n/a PDS3 (MPC 17257) Fit
diameter diameter 139.594 km 2.452 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 11.570 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Binzel, R.P.; Harris, A.W. (1980) Icarus 42, 43-45.]
[Zeigler, K.W.; Florence, W.B. (1985) Icarus 62, 512-517.]
[Lagerkvist, C.I.; Magnusson, P.; Williams, I.P.; Buontempo, M.E.; et al. (1988) Astron. Astrophys. Suppl. Ser. 73, 395-405.]
[Hoffmann, M.; Geyer, E.H. (1990) in Asteroids, Comets, Meteors III. C.-I. Lagerkvist, H. Rickman, B.A. Lindblad, M. Lindgren, eds. Uppsala, p. 111-114.]
[Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pilcher, F. (2013) Minor Planet Bull. 40, 33.]
[Pilcher, F. (2014) Minor Planet Bull. 41, 155-156.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
[Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.]
geometric albedo albedo 0.181   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.854   0.013 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=9; phase (min.=2.60, mean=19.31, max.=27.48) deg.
U-B UB 0.425   0.041 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=8; phase (min.=2.60, mean=18.73, max.=27.48) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B S   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)

18 Melpomene (A852 MA)          Discovered 1852-Jun-24 by Hind, J. R. at London
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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