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 ]  
18738 (1998 SN22)
Classification: Main-belt Asteroid          SPK-ID: 2018738
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09971373061332252 3.5491e-08  
a 2.685695456976584 1.2845e-08 au
q 2.417894743670197 9.6156e-08 au
i 13.03872288844817 5.0257e-06 deg
node 191.1992052597885 1.7758e-05 deg
peri 309.4878168859812 3.113e-05 deg
M 210.7076665443738 2.5326e-05 deg
tp 2459667.181768903105
(2022-Mar-28.68176890)
0.00011346 TDB
period 1607.620640991951
4.40
1.1534e-05
3.158e-08
d
yr
n .22393342734009 1.6066e-09 deg/d
Q 2.953496170282971 1.4126e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1405  
   data-arc span      23735 days (64.98 yr)  
   first obs. used      1954-09-06  
   last obs. used      2019-08-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48862  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 22:33:33  

Additional Information
 Earth MOID = 1.44963 au 
 Jupiter MOID = 2.09213 au 
 T_jup = 3.330 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456257.5 (2012-Nov-26.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09853234456056544 3.535e-08  
q 2.423012721527022 9.5548e-08 au
tp 2456445.850192054084
(2013-Jun-02.35019205)
0.00011575 TDB
node 191.3520073859252 1.7731e-05 deg
peri 308.4879176303295 3.1508e-05 deg
i 13.04430078384568 5.0293e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1405  
   data-arc span      23735 days (64.98 yr)  
   first obs. used      1954-09-06  
   last obs. used      2019-08-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48862  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 22:33:33  

Additional Information
 Jupiter MOID = 2.09213 au 
 T_jup = 3.330 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.249620052136404E-15 -3.352956038875276E-15 7.91385619345837E-13 3.669971068870567E-15 1.670808278404782E-13 1.139009992830781E-15
q -3.352956038875276E-15 9.129398462428004E-15 -2.219780812065903E-12 -1.097912147963041E-14 -4.730588888155115E-13 -3.036876332664051E-15
tp 7.91385619345837E-13 -2.219780812065903E-12 1.339813838117073E-8 -1.485438429783585E-12 3.029599393313466E-9 -4.819651320112665E-14
node 3.669971068870567E-15 -1.097912147963041E-14 -1.485438429783585E-12 3.143991562579023E-10 -3.06219720264331E-10 1.516641600298973E-11
peri 1.670808278404782E-13 -4.730588888155115E-13 3.029599393313466E-9 -3.06219720264331E-10 9.927502799891144E-10 -1.474718265219791E-11
i 1.139009992830781E-15 -3.036876332664051E-15 -4.819651320112665E-14 1.516641600298973E-11 -1.474718265219791E-11 2.529365088033911E-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 13.6   n/a MPO435873  
diameter diameter 4.508 km 0.475 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.316   0.073 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18738 (1998 SN22)          Discovered 1998-Sep-23 by Visnjan at Visnjan
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 SN22 = 1992 HN4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Mar-29 00:59 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin