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227978 (2007 HD81)
Classification: Main-belt Asteroid          SPK-ID: 2227978
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .118461675137676 4.9435e-08  
a 3.111797991236285 2.7387e-08 au
q 2.74316918850438 1.4913e-07 au
i 5.98861930812292 5.5877e-06 deg
node 31.0832977966923 3.9197e-05 deg
peri 325.4147451506107 4.498e-05 deg
M 75.26108072320497 1.9509e-05 deg
tp 2458977.336487860871
(2020-May-07.83648786)
0.00010992 TDB
period 2005.005281880841
5.49
2.6469e-05
7.247e-08
d
yr
n .1795506491944469 2.3703e-09 deg/d
Q 3.48042679396819 3.0631e-08 au
  Orbit Determination Parameters
   # obs. used (total)      304  
   data-arc span      6379 days (17.46 yr)  
   first obs. used      2003-07-25  
   last obs. used      2021-01-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55051  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 00:41:54  

Additional Information
 Earth MOID = 1.74113 au 
 Jupiter MOID = 1.97477 au 
 T_jup = 3.200 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457757.5 (2017-Jan-04.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1229896265468524 5.0136e-08  
q 2.726844968721603 1.5225e-07 au
tp 2456966.155367820246
(2014-Nov-04.65536782)
0.00011202 TDB
node 31.20436910318464 3.9019e-05 deg
peri 324.3396708209874 4.427e-05 deg
i 6.008954035753598 5.6012e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      304  
   data-arc span      6379 days (17.46 yr)  
   first obs. used      2003-07-25  
   last obs. used      2021-01-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55051  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 00:41:54  

Additional Information
 Jupiter MOID = 1.97477 au 
 T_jup = 3.200 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.51359941681129E-15 -7.546711601763183E-15 3.048444812653047E-13 6.261571840428617E-15 7.046312496954901E-15 -7.772121257674976E-16
q -7.546711601763183E-15 2.317904716659195E-14 -2.098658029504841E-12 -2.388111617992242E-14 -1.992385075823443E-13 3.333169403674329E-15
tp 3.048444812653047E-13 -2.098658029504841E-12 1.254780508374116E-8 8.436907891694939E-12 2.346485257460521E-9 -1.631473325472757E-12
node 6.261571840428617E-15 -2.388111617992242E-14 8.436907891694939E-12 1.52245418756689E-9 -1.51217090947482E-9 -1.880144491304719E-11
peri 7.046312496954901E-15 -1.992385075823443E-13 2.346485257460521E-9 -1.51217090947482E-9 1.959800089671838E-9 1.842967936099455E-11
i -7.772121257674976E-16 3.333169403674329E-15 -1.631473325472757E-12 -1.880144491304719E-11 1.842967936099455E-11 3.137377648793487E-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 15.90   n/a E2021B55  

227978 (2007 HD81)          Discovered 2007-Apr-25 by Mt. Lemmon Survey at Mount Lemmon
Reference: 20091202/Numbers.arcLast Updated: 2009-12-04

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1957-May-30 08:00 00:02 Jupiter 1.97802686564306 1.97802630990935 1.97802742137689 2.88241034142447 2.72980908127255 2435988.833499106 2.25653272739299 121.245400664711 18.3553935370459 -88.4172018942558 2529617.36950698 T 15 CATAB v2.0f-lin.ifort 2021-Apr-14 00:41:54 2021-Apr-14 00:41
2028-Oct-21 19:14 < 00:01 Jupiter 1.98140383335832 1.98140336118048 1.98140430553615 2.92132232388754 2.77112829132277 2462066.301511473 0.655847488026406 87.8144543681489 14.6335990874215 84.3195806525745 2658127.46678946 T 15 CATAB v2.0f-lin.ifort 2021-Apr-14 00:41:54 2021-Apr-14 00:41
2038-Dec-11 05:57 00:01 Jupiter 1.99651226133229 1.99651166801437 1.99651285465009 2.84951795613262 2.69652561535151 2465768.747898431 1.06474699177623 63.1276715153639 19.672599949991 89.7336596384473 2683299.00366694 T 15 CATAB v2.0f-lin.ifort 2021-Apr-14 00:41:54 2021-Apr-14 00:41
2100-Mar-16 01:46 00:03 Jupiter 1.98726130195269 1.98726077581405 1.98726182809156 2.95473059551669 2.80677409425037 2488143.573830733 3.43425046217664 154.839949501299 18.3853602006969 -89.1174284603393 2652650.57003522 T 15 CATAB v2.0f-lin.ifort 2021-Apr-14 00:41:54 2021-Apr-14 00:41
2110-May-07 16:36 00:04 Jupiter 1.98784298207956 1.98784219584643 1.98784376831416 2.83866762777839 2.68436794581699 2491848.191357023 3.94401016046697 131.684746869149 19.8342593281234 82.0570509733699 2862605.3470785 T 15 CATAB v2.0f-lin.ifort 2021-Apr-14 00:41:54 2021-Apr-14 00:41
2171-Aug-08 07:14 00:06 Jupiter 1.99600349012706 1.99600266721315 1.99600431304438 2.98734576682364 2.84174528477886 2514220.801483783 6.25256100930145 196.549083481582 22.8827084100955 -84.2618850239875 2592949.8123185 T 15 CATAB v2.0f-lin.ifort 2021-Apr-14 00:41:54 2021-Apr-14 00:41
2181-Oct-01 07:18 00:07 Jupiter 1.98637902935057 1.98637808074656 1.98637997796225 2.85486932451985 2.70137893639033 2517927.804158714 6.80170587572568 240.569579490248 18.040552388683 82.8446558455823 2951517.2876176 T 15 CATAB v2.0f-lin.ifort 2021-Apr-14 00:41:54 2021-Apr-14 00:41

Alternate Designations
 2007 HD81 = 2009 TS4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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