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101891 (1999 NL55)
Classification: Main-belt Asteroid          SPK-ID: 2101891
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .144512567625185 4.6017e-08  
a 3.096481044714749 2.8914e-08 au
q 2.649000618340305 1.5211e-07 au
i 14.42525474424796 5.2071e-06 deg
node 264.2950606436037 2.4345e-05 deg
peri 5.345229889819755 3.4331e-05 deg
M 8.478496264649841 2.4216e-05 deg
tp 2459153.627577684558
(2020-Oct-31.12757768)
0.00013394 TDB
period 1990.219905375651
5.45
2.7876e-05
7.632e-08
d
yr
n .1808845339289532 2.5336e-09 deg/d
Q 3.543961471089192 3.3092e-08 au
  Orbit Determination Parameters
   # obs. used (total)      767  
   data-arc span      7682 days (21.03 yr)  
   first obs. used      1999-07-12  
   last obs. used      2020-07-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5336  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 08:34:06  

Additional Information
 Earth MOID = 1.63152 au 
 Jupiter MOID = 1.56583 au 
 T_jup = 3.159 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457061.5 (2015-Feb-08.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1425292531886951 4.6098e-08  
q 2.65440274000191 1.5221e-07 au
tp 2457163.247223276517
(2015-May-20.74722328)
0.00014098 TDB
node 264.3159817288765 2.4342e-05 deg
peri 5.185543088680062 3.4532e-05 deg
i 14.42502963915086 5.2079e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      767  
   data-arc span      7682 days (21.03 yr)  
   first obs. used      1999-07-12  
   last obs. used      2020-07-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5336  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 08:34:06  

Additional Information
 Jupiter MOID = 1.56583 au 
 T_jup = 3.159 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.12500184851332E-15 -6.930327630834116E-15 -1.237648461246394E-12 -8.524669505806067E-15 -2.179865879099714E-13 9.331156859185365E-16
q -6.930327630834116E-15 2.316671742091449E-14 2.807333638734022E-12 3.902433063291552E-14 4.887360261685106E-13 -1.039153861186499E-15
tp -1.237648461246394E-12 2.807333638734022E-12 1.987572231984554E-8 -3.973291634323971E-11 3.519343483039037E-9 -9.434711849933529E-12
node -8.524669505806067E-15 3.902433063291552E-14 -3.973291634323971E-11 5.925185309221584E-10 -5.801463915904392E-10 -3.398558783400202E-11
peri -2.179865879099714E-13 4.887360261685106E-13 3.519343483039037E-9 -5.801463915904392E-10 1.192490805032801E-9 3.130778220651624E-11
i 9.331156859185365E-16 -1.039153861186499E-15 -9.434711849933529E-12 -3.398558783400202E-11 3.130778220651624E-11 2.712196073909158E-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 14.09   n/a E2021B55  
diameter diameter 6.724 km 0.144 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.129   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

101891 (1999 NL55)          Discovered 1999-Jul-12 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

[ 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
1931-Feb-14 10:20 00:04 Jupiter 1.82585796884008 1.82585516619533 1.82586077148795 4.0541235822266 3.93803381816502 2426386.930494374 3.52103475276194 228.651824181532 108.104298784477 62.9502696697573 2913860.41855013 T 21 CATAB v2.0g-lin.ifort 2021-May-04 08:34:10 2021-May-04 08:34
1941-Mar-21 22:56 00:03 Jupiter 1.68340143221064 1.68339952495215 1.68340333950376 3.67394462085249 3.53433818530307 2430075.455543785 3.23806863096662 424.557957950366 31.5069769433494 -76.5304228257307 2318202.47342715 T 21 CATAB v2.0g-lin.ifort 2021-May-04 08:34:10 2021-May-04 08:34
2001-Sep-14 20:35 < 00:01 Jupiter 1.6188010699809 1.61880060160635 1.61880153835545 4.0907172934558 3.96074319932193 2452167.357837990 0.59794959323317 170.27894196028 22.656059419021 -89.477809757337 3317852.22770656 T 21 CATAB v2.0g-lin.ifort 2021-May-04 08:34:10 2021-May-04 08:34
2011-Sep-14 23:41 < 00:01 Jupiter 1.91817028790463 1.91816955723325 1.91817101857602 3.11596573617557 2.97087288972781 2455819.486833684 0.38645405889561 71.7961946715875 37.8600757184597 85.1423274409143 1841330.61913639 T 21 CATAB v2.0g-lin.ifort 2021-May-04 08:34:10 2021-May-04 08:34
2072-Apr-28 05:49 00:02 Jupiter 1.564379701548 1.56437913698101 1.56438026612788 4.03109289398968 3.89446065937673 2477960.742697140 2.23990172023927 405.042709213851 22.0249358093288 -87.3880519101297 2919212.59362995 T 21 CATAB v2.0g-lin.ifort 2021-May-04 08:34:10 2021-May-04 08:34
2132-Oct-24 13:52 00:05 Jupiter 1.83426188964622 1.83425773573264 1.83426604356157 3.93796444348026 3.81890130383344 2500054.077842754 5.04756171158273 240.266695924028 146.671944047389 36.8651574425854 2151996.94221105 T 21 CATAB v2.0g-lin.ifort 2021-May-04 08:34:10 2021-May-04 08:34
2142-Dec-02 01:54 00:06 Jupiter 1.67960111108642 1.67959775199711 1.67960447029899 3.8354844190144 3.70166734330481 2503744.579275814 5.60629991588414 760.982693051851 27.9392880655832 -76.6996700853388 2504561.87155622 T 21 CATAB v2.0g-lin.ifort 2021-May-04 08:34:10 2021-May-04 08:34

Alternate Designations
 1999 NL55 = 2000 WH4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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