Matson, Robert D. Aug 31, 2013
--- In find_orb@yahoogroups.com, "Matson, Robert D." <matsonr@...> wrote:
>
> Looks like you're missing the oldest astrometry from 9/30/2011
> through 1/28/2012. That might explain the discrepancy.
>
> --Rob
>
> -----Original Message-----
> From: find_orb@yahoogroups.com on behalf of cbellh47
> Sent: Sat 8/31/2013 8:11 AM
> To: find_orb@yahoogroups.com
> Subject: [find_orb] Planet MOIDs
>
> Someone asked me what the planet MOIDs for comet C/2012 S1 (ISON) are. I ran Find_Orb with latest set of MPC observations. Find_Orb gives a good solution but surprisingly it gives an MOID for Mars
>
> all perturbers on
> Ma 0.1487
> all perturbers off
> Ma 0.1519
>
> These values are much larger than Mars close approach nominal distance of about 0.0725 AU.
>
> I'm stuck trying to resolve this.
>
>
> Orbital elements:
>
> C/2012 S1
>
> Perihelion 2013 Nov 28.776713 TT = 18:38:28 (JD 2456625.276713)
>
> Epoch 2013 Nov 4.0 TT = JDT 2456600.5 Earth MOID: 0.0578 Ve: 0.0800
>
> q 0.01244157 (2000.0) P Q
>
> M(N) 6.3 K 10.0 Peri. 345.56518 0.31514246 -0.51236211
>
> Node 295.65268 -0.75893961 0.36934200
>
> e 1.0000019 Incl. 62.40011 -0.56982092 -0.77528803
>
> From 3943 observations 2012 Sept. 21-2013 Aug. 23; mean residual 0".586.
>
> # State vector (heliocentric ecliptic J2000):
>
> # -0.392016068734 0.835201958865 0.015674428334 AU
>
> # 9.434225390851 -23.306814310270 -3.032845430140 mAU/day
>
> # MOIDs: Me 0.1702 Ve 0.0800 Ea 0.0578 Ma 0.1487
>
> # MOIDs: Ju 1.4676 Sa 3.1126 Ur 6.9083 Ne 12.1867
>
> # Elements written: 31 Aug 2013 14:54:56 (JD 2456536.121481)
>
> # Full range of obs: 2011 Sept. 30-2013 Aug. 23 (3960 observations)
>
> # Find_Orb ver: Jul 29 2012 19:28:55
>
> # Perturbers: 007007fe (Merc-Pluto plus Luna)
>
> # Tisserand relative to Earth: 0.14601
>
> # Tisserand relative to Jupiter: 0.06326
>
> # Tisserand relative to Neptune: 0.02193
>
> # %20$Name=C/2012%20S1 $Ty=2013 $Tm=11 $Td=28.776712 $MA=359.99995
>
> # $ecc=1.0000020 $Eqnx=2000.
>
> # $a=-6363.7856344 $Peri=345.56518 $Node=295.65268 $Incl=62.40011
>
> # $EpJD=2456600.500 $q=0.012442 $T=2456625.276713 $H=6.2
>
>
>
> [Non-text portions of this message have been removed]
>
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