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12923 Zephyr (1999 GK4)
Classification: Apollo [NEO, PHA]          SPK-ID: 2012923
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 335 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .492172649121202 3.4459e-08  
a 1.961659130138497 2.932e-09 au
q .9961841593854404 6.8134e-08 au
i 5.305363268761547 3.4702e-06 deg
node 168.1878593297555 3.3506e-05 deg
peri 147.0928934210929 3.3833e-05 deg
M 339.9203829127941 6.0881e-06 deg
tp 2459452.474041917120
(2021-Aug-25.97404192)
1.7035e-05 TDB
period 1003.537816615159
2.75
2.2499e-06
6.16e-09
d
yr
n .3587308759467052 8.0428e-10 deg/d
Q 2.927134100891554 4.3751e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2013  
   data-arc span      24203 days (66.26 yr)  
   first obs. used      1955-04-21  
   last obs. used      2021-07-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45151  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-28 05:48:49  

Additional Information
 Earth MOID = .0208539 au 
 Jupiter MOID = 2.41011 au 
 T_jup = 3.717 
[ 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 15.75   n/a E2021B10  
diameter diameter 2.060 km 0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  
rotation period rot_per 3.891 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (1999) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.199   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  
SMASSII spectral type spec_B S:   n/a Binzel et al. (2004) Icarus 170, 259-294 SMASSIR data only, classification consistent with specified type, but uncertain

12923 Zephyr           Discovered 1999 Apr. 11 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
The word zephyr derives from the name of the ancient Greek god of the west wind, Zephyros. The name was suggested by M. Smitherman.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040928/MPCPages.arcLast Updated: 2004-09-28

[ 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
1903-Jun-17 19:35 < 00:01 Earth 0.221276553410157 0.221274849194472 0.221278257627778 13.8650495105549 13.8641810119283 2416283.316262055 0.173502432725911 91.1284069911548 10.2520928693195 -21.3137336891443 1052287.37060244 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
1914-Jun-13 13:07 < 00:01 Earth 0.269201948354081 0.26919980305687 0.269204093653037 15.4788767963065 15.478237350586 2420297.046845082 0.193486613433839 112.331113469324 10.3316954227115 -17.8462758102615 1076132.97295046 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
1925-Jun-07 04:47 < 00:01 Earth 0.359999187034109 0.359996876844109 0.360001497224969 18.2829424055321 18.2825375784541 2424308.699025941 0.175077721187049 118.505938935532 10.533791804996 -13.626375146611 1128228.65414055 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
1936-Jun-02 07:05 < 00:01 Earth 0.446480814917265 0.446478538786774 0.446483091048188 20.8035114922811 20.8032246283789 2428321.795194403 0.157415134393246 115.715301115875 10.8129212289156 -11.2803700340631 1189209.36141688 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
1988-Oct-06 19:47 < 00:01 Earth 0.429618395534486 0.429617405869709 0.429619385199264 20.8603412737939 20.8600439626597 2447441.324089556 0.0930191008951392 49.3558216551454 8.6314253845901 0.912303973579853 1155741.69339954 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
1999-Oct-01 20:13 < 00:01 Earth 0.320676260321372 0.320675483168277 0.320677037474467 17.7236756351271 17.7232068244469 2451453.342583193 0.0712612701000373 38.7620759789316 8.62369901604857 1.30162318653076 1102543.88828751 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
2010-Sep-27 12:41 < 00:01 Earth 0.254583217926978 0.254582474943663 0.254583960910293 15.749596349017 15.7489318071917 2455467.028742964 0.0593174603225504 37.0646798923102 8.59263204909277 1.74064021826943 927884.384698794 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
2021-Sep-25 03:24 < 00:01 Earth 0.217383081726099 0.217382176385992 0.217383987066205 14.684492610196 14.6836578917437 2459482.641984520 0.0701860000652427 45.1581212864046 8.5392351418586 1.46254013077352 646833.20943874 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
2032-Sep-22 21:12 < 00:01 Earth 0.186018462012806 0.186017388594203 0.18601953543141 13.7914157995784 13.7903771625323 2463498.383676657 0.0940684964891187 53.5290190015671 8.51969833943317 0.763023186094646 461281.767079753 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
2043-Sep-24 15:21 < 00:01 Earth 0.202999380801518 0.202998313329941 0.203000448273095 14.2266497636349 14.2257271304175 2467517.139327105 0.0971702567749964 53.2347437205433 8.53412696466792 0.92440661670403 503425.462101796 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
2054-Sep-29 20:21 < 00:01 Earth 0.284299051171729 0.284298116119154 0.284299986224321 16.6168121624362 16.6162481397058 2471540.348214125 0.0864857987401162 46.649949551325 8.51789655363906 1.873084029818 810001.860422598 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
2065-Oct-04 20:42 < 00:01 Earth 0.369006993480653 0.369006118161619 0.369007868799688 19.1569643694492 19.1565874441044 2475563.362845074 0.0898337926319517 43.6732534381857 8.48633876467227 1.99973328502424 1122438.51319357 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
2076-Oct-08 19:59 < 00:01 Earth 0.448239057300004 0.448238169341414 0.448239945258594 21.4205492550188 21.4202717474253 2479585.332950427 0.0978982762782112 44.2978923453769 8.47520426343818 1.74304816657935 1341036.05971842 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
2123-Jun-05 06:23 < 00:01 Earth 0.471522827940832 0.471520862209152 0.471524793672728 21.531261920346 21.5309994726306 2496624.765897947 0.109260135962287 99.4522898310228 10.550040261359 -9.78555736367549 1193476.1293742 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
2134-Jun-11 04:12 < 00:01 Earth 0.364457937727911 0.364455788782219 0.364460086674266 18.4196757744932 18.4192788685143 2500648.675096728 0.142596588379547 109.986982271256 10.5688146585834 -13.0876424604098 1111089.91042501 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
2145-Jun-14 17:18 < 00:01 Earth 0.303293515596734 0.303291368311894 0.303295662882762 16.5988609181037 16.5983316473828 2504670.221108085 0.161326804106638 111.226451105149 10.5788699079048 -15.7806759113331 1071677.83976354 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
2156-Jun-17 06:15 < 00:01 Earth 0.268744269044324 0.268742364890257 0.268746173199706 15.4525888741878 15.4519472497281 2508690.760581892 0.152234485034374 99.5573865202008 10.6178988413034 -17.6054591726821 1047640.84838153 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
2167-Jun-22 15:14 < 00:01 Earth 0.220243327613771 0.220241892728675 0.220244762500208 13.7729127341607 13.7720343233938 2512713.134831244 0.129457258979541 76.6162681521782 10.6600421570075 -21.1731310246132 1027144.34134209 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
2178-Jun-24 18:32 < 00:01 Earth 0.19592809294234 0.195927201507952 0.195928984377441 12.9839219031104 12.982874467659 2516733.272395812 0.0851412273139785 48.4476004708199 10.7099576936901 -24.07237783276 1092818.86143767 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
2189-Jun-21 01:30 < 00:01 Earth 0.232195980394112 0.232195574682434 0.232196386105923 14.2387893861602 14.237983456973 2520747.562481593 0.0761432250720319 22.5210651033693 10.4877389254838 -29.7730149648668 1842613.23711477 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
2200-Jun-17 18:26 < 00:01 Earth 0.288240855472759 0.288240087935301 0.28824162301061 15.9991006298174 15.998522841055 2524761.268076682 0.135074132218543 41.9576311934014 9.91442664777995 -24.9471282234882 1687064.7776174 T 335 CATAB v2.0g-lin.ifort 2021-Jul-28 05:48:53 2021-Jul-28 05:48
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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