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18736 (1998 NU)
Classification: Amor [NEO]          SPK-ID: 2018736
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 268 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4895472391451068 2.5079e-08  
a 2.352132679066552 4.7235e-09 au
q 1.200652619926538 5.9595e-08 au
i 2.806883494633794 2.8285e-06 deg
node 297.4936042736643 5.3923e-05 deg
peri 222.8392756136656 5.4088e-05 deg
M 176.6741791591116 1.6775e-06 deg
tp 2458553.861241482554
(2019-Mar-11.36124148)
6.3334e-06 TDB
period 1317.622949625432
3.61
3.969e-06
1.087e-08
d
yr
n .2732192848510563 8.2301e-10 deg/d
Q 3.503612738206566 7.0359e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1659  
   data-arc span      24226 days (66.33 yr)  
   first obs. used      1954-05-25  
   last obs. used      2020-09-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44409  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:36:08  

Additional Information
 Earth MOID = .212507 au 
 Jupiter MOID = 1.50123 au 
 T_jup = 3.383 
[ show covariance matrix ]

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 15.94   n/a E2021B10  
rotation period rot_per 2.4753 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Carreno, A.; Arce, E.; Fornas, G.; Mas, V. (2019) Minor Planet Bull. 46, 200-203.]
[Polakis, T. (2019) Minor Planet Bull. 46, 287-292.]
[Pravec, P.; Wolf, M.; Sarounova, L. (2019) http://www.asu.cas.cz/~ppravec/neo.htm]
[Warner, B.D.; Stephens, R.D. (2019) Minor Planet Bull. 46, 304-314.]
SMASSII spectral type spec_B Sk   n/a Binzel et al. (2004) Icarus 170, 259-294  

18736 (1998 NU)          Discovered 1998-Jul-02 by Spacewatch at Kitt Peak
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 NU = 1999 TB323 = 1999 TT52 = 1999 US60 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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