Re: New JPL Format for Horizons Ephemeris #APCC - Format Causes Issue #APCC


Ray Gralak
 

Hi Don,

 

The data from the web site just loaded okay for me. I think the default settings are a little different. See this screenshot for the settings I used. Also, it appears that you cannot use control-A followed by control-C to copy the data because the data doesn’t open up in a new window. You have to manually select and copy just the generated lines of the data.

-Ray

 

> -----Original Message-----

> From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of dnakic via groups.io

> Sent: Friday, October 1, 2021 2:48 PM

> To: main@ap-gto.groups.io

> Subject: [ap-gto] New JPL Format for Horizons Ephemeris #APCC - Format Causes Issue

>

> This past Monday I was using Horizons and went to JPL Website to download Ephemeris.  I did both the text

> file download and the data and the format looks a bit different.  Note, the website looks different too.  The

> data pull would not work in Horizons.  Appreciate insight into issue.

>

>

> Header format:

>

> *******************************************************************************

>  Revised: July 31, 2013             Moon / (Earth)                          301

>

>  GEOPHYSICAL DATA (updated 2018-Aug-15):

>   Vol. mean radius, km  = 1737.53+-0.03    Mass, x10^22 kg       =    7.349

>   Radius (gravity), km  = 1738.0           Surface emissivity    =    0.92

>   Radius (IAU), km      = 1737.4           GM, km^3/s^2          = 4902.800066

>   Density, g/cm^3       =    3.3437        GM 1-sigma, km^3/s^2  =  +-0.0001

>   V(1,0)                =   +0.21          Surface accel., m/s^2 =    1.62

>   Earth/Moon mass ratio = 81.3005690769    Farside crust. thick. = ~80 - 90 km

>   Mean crustal density  = 2.97+-.07 g/cm^3 Nearside crust. thick.= 58+-8 km

>   Heat flow, Apollo 15  = 3.1+-.6 mW/m^2   Mean angular diameter = 31'05.2"

>   Heat flow, Apollo 17  = 2.2+-.5 mW/m^2   Sid. rot. rate, rad/s = 0.0000026617

>   Geometric Albedo      = 0.12             Mean solar day        = 29.5306 d

>   Obliquity to orbit    = 6.67 deg         Orbit period          = 27.321582 d

>   Semi-major axis, a    = 384400 km        Eccentricity          = 0.05490

>   Mean motion, rad/s    = 2.6616995x10^-6  Inclination           = 5.145 deg

>   Apsidal period        = 3231.50 d        Nodal period          = 6798.38 d

>                                  Perihelion  Aphelion    Mean

>   Solar Constant (W/m^2)         1414+-7     1323+-7     1368+-7

>   Maximum Planetary IR (W/m^2)   1314        1226        1268

>   Minimum Planetary IR (W/m^2)      5.2         5.2         5.2

> ********************************************************************************

>

>

>

> Thanks,

> Don

>

>

>

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