User:Wikibob/Sandbox3

Attempt at getting Deimos transit info from JPL Horizons.

Deciphering timestamps from Mars Rover image filenames
Explains the image filename fields, and we're interested in characters:

3 to 11  Spacecraft clock This is the number of seconds since January 1, 2000 at 11:58:55.816 UTC.

So from the Sol 30 March 4 Deimos transit image filenames.

If I've not made a miscalculation, and if Opportunity's onboard clock was correct, then UTC times for the 4 Deimos transit images were: Mar 4 03:03:43 = Image 1 showing mid-transit Mar 4 03:03:53 = Image 2 still in transit Mar 4 03:04:03 = Image 3 approaching third contact Mar 4 03:04:13 = Image 4 possibly between third and fourth contact

Compare with the 3 Opportunity images mentioned in IAU circular 08298: Mar 4 03:03:56 Mar. 4.12773 UT   Mar 4 03:04:06  Mar. 4.12785 Mar 4 03:04:16 Mar. 4.12819

Some calculations, MER-0 is 0 seconds for the Rover clock:

UTC decimal      HH:MM:SS  Julian Day     secs since MER-0 --- 2000 Jan 1 noon =          2451545.0             64.184 2004 Mar 3 noon =          2453068.0      131587264.184 =1523 days +64secs 2004 Mar 4.127581 03:03:43 2453068.627581 131641487.0   = Image 1 2004 Mar 4.127697 03:03:53 2453068.627697 131641497.0   = Image 2 2004 Mar 4.127812 03:04:03 2453068.627812 131641507.0   = Image 3 2004 Mar 4.127928 03:04:13 2453068.627928 131641517.0   = Image 4

more notes... Local Time Filename                    Seconds 10:28:17   1P131641487ESF0544P2665R8M1 131641487 10:28:27   1P131641497ESF0544P2666R8M1 131641497

See Transit of Deimos from Mars and User_talk:Curps.

2 198.05 miles = 3 537.41858 kilometers 564.48 miles = 908.442501 kilometers

Using Mars Rover Spirit's coords: -175.4833, 3537.41, 908.44
Select ... [E]phemeris, [F]tp, [M]ail, [R]edisplay, ?, : 402 Revised: May 04, 1999            Deimos / (Mars)                          402

SATELLITE PHYSICAL PROPERTIES: Radius (km)            = 7.8 x 6.0 x 5.1 Density (g cm^-3)   =  1.76 +- 0.30 Mass (10^20 kg )       = 1.80 (10^-5)    Geometric Albedo    =  0.06 (+- 0.15)   V(1,0)              = +12.89

SATELLITE ORBITAL DATA: Semi-major axis, a (km) = 23.4632(10^3)  Orbital period      = 1.262441 d  Eccentricity, e         =  0.00033        Rotational period   = Synchronous Inclination, i (deg)   =  1.791 Select ... [E]phemeris, [F]tp, [M]ail, [R]edisplay, ?, : e

Observe, Elements, Vectors [o,e,v,?] : o

Coordinate center [ ,coord,geo ] : Spirit@499

#  E. Lon    DXY      DZ    Observatory Name --- --- ---       -175.4833 +219805 -056448  Spirit Landing Site (MER) / Gusev Confirm selected station   [ y/n ] --> y

Starting UT [ex: 1976-Jun-02 00:02 ] : 2004-Mar-09 15:50

Ending  UT  [ex: 2025-Jan-10 23:56 ] : 2004-Mar-09 15:58

Output interval [ex: 10m, 1h, 1d, ? ] : 1m Current output table defaults -- Reference frame      = ICRF/J2000.0 Time zone correction = UT+00:00 Time format          = CAL Time digits output   = MIN R.A. format          = HMS RA/DEC extra precision= NO           Apparent coord. type = AIRLESS Range units          = AU     Suppress range-rate   = NO     Minimum elevation     = -90.0 Maximum airmass      = 38.0000 Rise-Transit-Set only = NO  Skip daylight         = NO   Solar elong. cut-off = 0,180 CSV spreadsheet output= NO  Table quantities      = A Accept default output [ cr=(y), n, ?] :

Select table quantities [ <#,#..>, ?] : 4,5,13,23,34 Working ... Ephemeris / PORT_LOGIN Thu Jun 17 16:17:25 2004 Pasadena, USA   / Horizons Target body name: Deimos (402)                   {source: MAR033.DE405} Center body name: Mars (499)                     {source: DE-0406LE-0406} Center-site name: Spirit Landing Site (MER) / Gusev Start time     : A.D. 2004-Mar-09 15:50:00.0000 UT      Stop  time      : A.D. 2004-Mar-09 15:58:00.0000 UT      Step-size       : 1 minutes Center geodetic : -175.483300,  -14.5667,    -0.0{E-lon(deg),Lat(deg),Alt(km)} Center cylindric: -175.483300, 3288.2360,  -844.4{E-lon(deg),Dxy(km),Dz(km)} Center pole/equ : IAU_MARS                       {East-longitude -} Center radii   : 3396.2 x 3396.2 x 3376.2 km     {Equator, meridian, pole} Target pole/equ : IAU_DEIMOS                     {East-longitude -} Target radii   : 7.5 x 6.1 x 5.2 km              {Equator, meridian, pole} Target primary : Mars                            {source: DE-0406LE-0406} Interfering body: PHOBOS (Req= 13.400) km        {source: MAR033.DE405} Deflecting body : Sun                            {source: DE-0406LE-0406} Deflecting GM  : 1.3271E+11 km^3/s^2 Atmos refraction: NO (AIRLESS) RA format      : HMS

Previous attempt using DXY and DZ as KM when they were miles. telnet ssd.jpl.nasa.gov 6775 ... Horizons> 402 Revised: May 04, 1999            Deimos / (Mars)                          402

SATELLITE PHYSICAL PROPERTIES: Radius (km)            = 7.8 x 6.0 x 5.1 Density (g cm^-3)   =  1.76 +- 0.30 Mass (10^20 kg )       = 1.80 (10^-5)    Geometric Albedo    =  0.06 (+- 0.15)   V(1,0)              = +12.89

SATELLITE ORBITAL DATA: Semi-major axis, a (km) = 23.4632(10^3)  Orbital period      = 1.262441 d  Eccentricity, e         =  0.00033        Rotational period   = Synchronous Inclination, i (deg)   =  1.791 Select ... [E]phemeris, [F]tp, [M]ail, [R]edisplay, ?, : e Observe, Elements, Vectors [o,e,v,?] : o Use previous center  [ cr=(y), n, ? ] : n Coordinate center [ ,coord,geo ] : c@499 Cylindrical or Geodetic input [ c,g ] : c Input units must be DEGREES and KILOMETERS -- Specify cylindr {E. Long, DXY, DZ} : -175.4833, +3198.05, -0564.48 Starting UT [ex: 1976-Jun-02 00:02 ] : 2004-Mar-09 15:50 Ending  UT  [ex: 2025-Jan-10 23:56 ] : 2004-Mar-09 15:59 Output interval [ex: 10m, 1h, 1d, ? ] : 1m

Ephemeris / PORT_LOGIN Thu Jun 17 15:18:18 2004 Pasadena, USA   / Horizons Target body name: Deimos (402)                   {source: MAR033.DE405} Center body name: Mars (499)                     {source: DE-0406LE-0406} Center-site name: (User Defined Site) Start time     : A.D. 2004-Mar-09 15:50:00.0000 UT      Stop  time      : A.D. 2004-Mar-09 15:59:00.0000 UT      Step-size       : 1 minutes Center geodetic : -175.483300,  -10.1318,  -148.0{E-lon(deg),Lat(deg),Alt(km)} Center cylindric: -175.483300, 3198.0500,  -564.4{E-lon(deg),Dxy(km),Dz(km)} Center pole/equ : IAU_MARS                       {East-longitude -} Center radii   : 3396.2 x 3396.2 x 3376.2 km     {Equator, meridian, pole} Target pole/equ : IAU_DEIMOS                     {East-longitude -} Target radii   : 7.5 x 6.1 x 5.2 km              {Equator, meridian, pole} Target primary : Mars                            {source: DE-0406LE-0406} Interfering body: PHOBOS (Req= 13.400) km        {source: MAR033.DE405} Deflecting body : Sun                            {source: DE-0406LE-0406} Deflecting GM  : 1.3271E+11 km^3/s^2 Atmos refraction: NO (AIRLESS) RA format      : DEG < Scroll & Page: space, , ack, OR arrow keys. ends display. > 20% Time format    : CAL RTS-only print : NO       EOP file        : eop.040617.p040908 EOP coverage   : DATA-BASED 1962-JAN-20 TO 2004-JUN-17. PREDICTS-> 2004-SEP-07 Units conversion: 1 AU= 149597870.691 km, c= 299792.458 km/s, 1 day= 86400.0 s Table cut-offs 1: Elevation (-90.0deg=NO ),Airmass    n.a.   , Daylight (NO ) Table cut-offs 2: Solar Elongation ( 0.0,180.0=NO ) Date__(UT)__HR:MN:SS    Azi_(a-appr)_Elev L_Ap_Sid_Time Ang-diam    S-O-T /r $$SOE 2004-Mar-09 15:50:00 *x 235.1606 -74.2769 14.1024935262  116.462 130.0487 /T 2004-Mar-09 15:51:00 *x 235.0815 -74.3112 14.1187385252  116.459 130.2516 /T 2004-Mar-09 15:52:00 *x 235.0020 -74.3453 14.1349835243  116.456 130.4545 /T 2004-Mar-09 15:53:00 *x 234.9223 -74.3795 14.1512285233  116.454 130.6573 /T 2004-Mar-09 15:54:00 *x 234.8422 -74.4136 14.1674735223  116.451 130.8602 /T 2004-Mar-09 15:55:00 *x 234.7618 -74.4477 14.1837185213  116.448 131.0630 /T 2004-Mar-09 15:56:00 *x 234.6810 -74.4818 14.1999635203  116.446 131.2659 /T 2004-Mar-09 15:57:00 *x 234.6000 -74.5158 14.2162085193  116.443 131.4687 /T 2004-Mar-09 15:58:00 *x 234.5185 -74.5498 14.2324535183  116.441 131.6716 /T 2004-Mar-09 15:59:00 *x 234.4368 -74.5838 14.2486985174  116.438 131.8744 /T