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19486 (1998 HW122)
Classification: Main-belt Asteroid          SPK-ID: 2019486
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04540756880863506 9.1638e-09  
a 2.763292578361027 1.2373e-08 au
q 2.637818180470708 2.3485e-08 au
i 9.603608041416441 2.995e-07 deg
node 89.7074483931528 5.4417e-06 deg
peri 35.53788087161866 4.0446e-05 deg
M 64.79618192994013 3.8529e-05 deg
tp 2458898.514807652502
(2020-Feb-19.01480765)
0.00017963 TDB
period 1677.794370085654
4.59
1.1269e-05
3.085e-08
d
yr
n .2145674144690456 1.4411e-09 deg/d
Q 2.888766976251346 1.2935e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2122  
   data-arc span      13962 days (38.23 yr)  
   first obs. used      1982-12-23  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45824  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:54:57  

Additional Information
 Earth MOID = 1.65978 au 
 Jupiter MOID = 2.18855 au 
 T_jup = 3.319 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457264.5 (2015-Aug-30.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04568849049237799 9.0781e-09  
q 2.638398503693711 2.3505e-08 au
tp 2457230.969381415898
(2015-Jul-27.46938142)
0.00017878 TDB
node 89.79638616594684 5.4379e-06 deg
peri 37.85437486746624 4.009e-05 deg
i 9.603910859531204 2.9965e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2122  
   data-arc span      13962 days (38.23 yr)  
   first obs. used      1982-12-23  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45824  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:54:57  

Additional Information
 Jupiter MOID = 2.18855 au 
 T_jup = 3.319 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.24124103820271E-17 -1.886614373439299E-16 1.448434660992647E-14 1.377633655131581E-14 -1.2860142757639E-14 7.803224495617871E-16
q -1.886614373439299E-16 5.525069826325232E-16 -2.996115122757304E-13 -4.024631769760787E-14 -2.110863554074903E-14 -2.074624054790445E-15
tp 1.448434660992647E-14 -2.996115122757304E-13 3.196109554006977E-8 1.679339778042361E-10 7.100242131748206E-9 -7.352417000617274E-12
node 1.377633655131581E-14 -4.024631769760787E-14 1.679339778042361E-10 2.95710719712393E-11 8.318942619071142E-12 4.009238252533918E-13
peri -1.2860142757639E-14 -2.110863554074903E-14 7.100242131748206E-9 8.318942619071142E-12 1.607186486467367E-9 -1.999304844138841E-12
i 7.803224495617871E-16 -2.074624054790445E-15 -7.352417000617274E-12 4.009238252533918E-13 -1.999304844138841E-12 8.978753030542298E-14

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 13.32   n/a E2021B10  
diameter diameter 6.607 km 0.140 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 184.437 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.161   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19486 (1998 HW122)          Discovered 1998-Apr-23 by LINEAR at Socorro
Reference: 20001211/Numbers.arcLast Updated: 2004-04-19

[ 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
2060-Nov-23 06:59 00:01 Psych 0.0441020909170483 0.044096827894032 0.044107356666992 3.74164419049071 3.74164411716919 2473786.790787692 1.19131101767285 613.219588519313 44.625636197989 65.0115137450568 133941.134980409 T 32 CATAB v2.0f-lin.ifort 2021-Apr-13 02:55:57 2021-Apr-13 02:55

Alternate Designations
 1998 HW122 = 1982 YE4 = 2000 UB26 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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