Asteroid (99942) Apophis (orig:2004 MN4)

starfleetengineer · Post #1by **starfleetengineer** » 24.02.2007, 01:49

I've created an SSC for Apophis:
Click HEREto download it (1Kb), then just unzip it into your extras folder:

This should be "taken with a grain of salt" as it is based on the data published at the WIKI page for Apothis, so is likely to be inaccurate or out of date.
Updated data from more reliable or recent sources would be welcomed. Please post it here, if you know of better data.

Reiko · Post #2by **Reiko** » 24.02.2007, 05:13

cool!

LordFerret · Post #3by **LordFerret** » 24.02.2007, 07:21

You should check out NASA's HORIZONS site:
http://ssd.jpl.nasa.gov/?horizons

Code: Select all

HORIZONS Web-Interface
This tool provides a web-based limited interface to JPL's HORIZONS system which can be used to generate ephemerides for solar-system bodies. Full access to HORIZONS features is available via the primary telnet interface. HORIZONS system news shows recent changes and improvements. A web-interface tutorial is available to assist new users.  

Current Settings
Ephemeris Type [change] :  ELEMENTS 
Target Body [change] :  Asteroid 99942 Apophis (2004 MN4) 
Center [change] :  Sun (body center) [500@10] 
Time Span [change] :  Start=2007-02-24, Stop=2007-03-06, Step=1 d 
Table Settings [change] :  output units=KM-S 
Display/Output [change] :  default (formatted HTML) 

--------------------------------------------------------------------------------

Object Data Page
JPL/HORIZONS              99942 Apophis (2004 MN4)         2007-Feb-23 23:18:07
Rec #: 99942 (+COV)   Soln.date: 2006-Sep-01_00:50:35    # obs: 738 (2004-2006)
 
FK5/J2000.0 helio. ecliptic osc. elements (AU, DAYS, DEG, period=Julian yrs):  
 
  EPOCH=  2453442.5 ! 2005-Mar-13.00 (CT)         Residual RMS= .30901         
    EC= .191054853916459   QR= .7461531666439291  TP= 2453600.734981114        
    OM= 204.4721548004914  W= 126.3839706419199   IN= 3.330920734685656        
    A= .9223779514054623   MA= 183.94709163245    ADIST= 1.098602736166995     
    PER= .88587            N= 1.112604224         ANGMOM= .016216656           
    DAN= 1.0023            DDN= .7982399999999999 L= 330.9024012               
    B= 2.6810584                                  TP= 2005-Aug-18.2349811      
 
Physical parameters (KM, SEC, rotational period in hours):
    GM= n.a.               RAD= .125              ROTPER= n.a.                 
    H= 19.7                G= .250                B-V= n.a.                    
                           ALBEDO= n.a.           STYP= n.a.                   
 
ASTEROID comments: 
1: soln ref.= JPL#139, PHA  OCC=0       radar( 2 delay, 5 Dop.)
2: source=ORB
 

Results
*******************************************************************************
Ephemeris / WWW_USER Fri Feb 23 23:18:07 2007  Pasadena, USA     / Horizons    
*******************************************************************************
Target body name: 99942 Apophis (2004 MN4)        {source: JPL#139}
Center body name: Sun (10)                        {source: DE405}
Center-site name: BODY CENTER
*******************************************************************************
Start time      : A.D. 2007-Feb-24 00:00:00.0000 CT 
Stop  time      : A.D. 2007-Mar-06 00:00:00.0000 CT 
Step-size       : 1440 minutes
*******************************************************************************
Center geodetic : .000000000,.000000000,.00000000 {E-lon(deg),Lat(deg),Alt(km)}
Center cylindric: .000000000,.000000000,.00000000 {E-lon(deg),Dxy(km),Dz(km)}
Center radii    : 696000.0 x 696000.0 x 696000.0 k{Equator, meridian, pole}    
System GM       : 1.3271244001798691E+11 km^3/s^2
Small perturbers: Ceres, Pallas, Vesta            {source: SB405-CPV-2}
Small body GMs  : 6.32E+01, 1.43E+01, 1.78E+01 km^3/s^2                        
Output units    : KM-S, deg, Julian day number (Tp)                            
Output format   : 10
Reference frame : ICRF/J2000.0                                                 
Output type     : GEOMETRIC osculating elements
Coordinate systm: Ecliptic and Mean Equinox of Reference Epoch                 
*******************************************************************************
Initial FK5/J2000.0 heliocentric ecliptic osculating elements (AU, DAYS, DEG):
  EPOCH=  2453442.5 ! 2005-Mar-13.00 (CT)         Residual RMS= .30901         
    EC= .191054853916459   QR= .7461531666439291  TP= 2453600.734981114        
    OM= 204.4721548004914  W= 126.3839706419199   IN= 3.330920734685656        
Asteroid physical parameters (KM, SEC, rotational period in hours):
    GM= n.a.               RAD= .125              ROTPER= n.a.                 
    H= 19.7                G= .250                B-V= n.a.                    
                           ALBEDO= n.a.           STYP= n.a.                   
*******************************************************************************
JDCT 
   EC    QR   IN
   OM    W    Tp
   N     MA   TA
   A     AD   PR
*******************************************************************************
$$SOE
2454155.500000000 = A.D. 2007-Feb-24 00:00:00.0000 (CT)
 EC= 1.910682546061348E-01 QR= 1.116061525875464E+08 IN= 3.331344329708996E+00
 OM= 2.044594454147039E+02 W = 1.263880699237133E+02 Tp=  2454247.801540238317
 N = 1.287994660539988E-05 MA= 2.572843181875057E+02 TA= 2.373984312087452E+02
 A = 1.379673294107229E+08 AD= 1.643285062338994E+08 PR= 2.795042642871446E+07
2454156.500000000 = A.D. 2007-Feb-25 00:00:00.0000 (CT)
 EC= 1.910680222394542E-01 QR= 1.116062236050638E+08 IN= 3.331343771370815E+00
 OM= 2.044594446987226E+02 W = 1.263879740322582E+02 Tp=  2454247.801509974524
 N = 1.287993986137483E-05 MA= 2.583972324524258E+02 TA= 2.383482271395173E+02
 A = 1.379673775711468E+08 AD= 1.643285315372298E+08 PR= 2.795044106374989E+07
2454157.500000000 = A.D. 2007-Feb-26 00:00:00.0000 (CT)
 EC= 1.910677925195183E-01 QR= 1.116062938470563E+08 IN= 3.331343208427863E+00
 OM= 2.044594438146700E+02 W = 1.263878787353242E+02 Tp=  2454247.801479607821
 N = 1.287993318839601E-05 MA= 2.595101451126370E+02 TA= 2.393037483742223E+02
 A = 1.379674252242568E+08 AD= 1.643285566014572E+08 PR= 2.795045554462479E+07
2454158.500000000 = A.D. 2007-Feb-27 00:00:00.0000 (CT)
 EC= 1.910675653890100E-01 QR= 1.116063632791538E+08 IN= 3.331342640951901E+00
 OM= 2.044594427585272E+02 W = 1.263877841395616E+02 Tp=  2454247.801449197810
 N = 1.287992659378179E-05 MA= 2.606230560627577E+02 TA= 2.402651055898891E+02
 A = 1.379674723177895E+08 AD= 1.643285813564251E+08 PR= 2.795046985545724E+07
2454159.500000000 = A.D. 2007-Feb-28 00:00:00.0000 (CT)
 EC= 1.910673407930387E-01 QR= 1.116064318682921E+08 IN= 3.331342068826169E+00
 OM= 2.044594415257719E+02 W = 1.263876903451049E+02 Tp=  2454247.801418799907
 N = 1.287992008456644E-05 MA= 2.617359652085241E+02 TA= 2.412324104271422E+02
 A = 1.379675188015102E+08 AD= 1.643286057347284E+08 PR= 2.795048398098180E+07
2454160.500000000 = A.D. 2007-Mar-01 00:00:00.0000 (CT)
 EC= 1.910671186810762E-01 QR= 1.116064995819777E+08 IN= 3.331341491790425E+00
 OM= 2.044594401112562E+02 W = 1.263875974473258E+02 Tp=  2454247.801388463471
 N = 1.287991366758124E-05 MA= 2.628488724649646E+02 TA= 2.422057754651059E+02
 A = 1.379675646266338E+08 AD= 1.643286296712899E+08 PR= 2.795049790637343E+07
2454161.500000000 = A.D. 2007-Mar-02 00:00:00.0000 (CT)
 EC= 1.910668990076666E-01 QR= 1.116065663878414E+08 IN= 3.331340909477982E+00
 OM= 2.044594385091243E+02 W = 1.263875055382449E+02 Tp=  2454247.801358235069
 N = 1.287990734951478E-05 MA= 2.639617777548399E+02 TA= 2.431853141931160E+02
 A = 1.379676097453937E+08 AD= 1.643286531029460E+08 PR= 2.795051161711672E+07
2454162.500000000 = A.D. 2007-Mar-03 00:00:00.0000 (CT)
 EC= 1.910666817322178E-01 QR= 1.116066322534272E+08 IN= 3.331340321445388E+00
 OM= 2.044594367127562E+02 W = 1.263874147076192E+02 Tp=  2454247.801328158006
 N = 1.287990113695450E-05 MA= 2.650746810073601E+02 TA= 2.441711409790085E+02
 A = 1.379676541107458E+08 AD= 1.643286759680644E+08 PR= 2.795052509891573E+07
2454163.500000000 = A.D. 2007-Mar-04 00:00:00.0000 (CT)
 EC= 1.910664668181049E-01 QR= 1.116066971461622E+08 IN= 3.331339727195973E+00
 OM= 2.044594347147321E+02 W = 1.263873250437517E+02 Tp=  2454247.801298272330
 N = 1.287989503641331E-05 MA= 2.661875821571479E+02 TA= 2.451633710337120E+02
 A = 1.379676976761780E+08 AD= 1.643286982061937E+08 PR= 2.795053833763617E+07
2454164.500000000 = A.D. 2007-Mar-05 00:00:00.0000 (CT)
 EC= 1.910662542312971E-01 QR= 1.116067610334596E+08 IN= 3.331339126198750E+00
 OM= 2.044594325068107E+02 W = 1.263872366340624E+02 Tp=  2454247.801268617157
 N = 1.287988905434452E-05 MA= 2.673004811434187E+02 TA= 2.461621203718632E+02
 A = 1.379677403956036E+08 AD= 1.643287197577476E+08 PR= 2.795055131927306E+07
2454165.500000000 = A.D. 2007-Mar-06 00:00:00.0000 (CT)
 EC= 1.910660439386819E-01 QR= 1.116068238829078E+08 IN= 3.331338517904167E+00
 OM= 2.044594300799201E+02 W = 1.263871495654798E+02 Tp=  2454247.801239230670
 N = 1.287988319714922E-05 MA= 2.684133779093257E+02 TA= 2.471675057681318E+02
 A = 1.379677822233090E+08 AD= 1.643287405637103E+08 PR= 2.795056402993476E+07
$$EOE
*******************************************************************************
Coordinate system description:

  Ecliptic and Mean Equinox of Reference Epoch

    Reference epoch: J2000.0
    xy-plane: plane of the Earth's orbit at the reference epoch
    x-axis  : out along ascending node of instantaneous plane of the Earth's
              orbit and the Earth's mean equator at the reference epoch
    z-axis  : perpendicular to the xy-plane in the directional (+ or -) sense
              of Earth's north pole at the reference epoch.

Symbol meaning  

    JDCT     Epoch Julian Date, Coordinate Time
      EC     Eccentricity, e                                                   
      QR     Periapsis distance, q (km)                                        
      IN     Inclination w.r.t xy-plane, i (degrees)                           
      OM     Longitude of Ascending Node, OMEGA, (degrees)                     
      W      Argument of Perifocus, w (degrees)                                
      Tp     Time of periapsis (Julian day number)                             
      N      Mean motion, n (degrees/sec)                                      
      MA     Mean anomaly, M (degrees)                                         
      TA     True anomaly, nu (degrees)                                        
      A      Semi-major axis, a (km)                                           
      AD     Apoapsis distance (km)                                            
      PR     Orbital period (sec)                                              

Geometric states/elements have no aberration corrections applied.

 Computations by ...
     Solar System Dynamics Group, Horizons On-Line Ephemeris System
     4800 Oak Grove Drive, Jet Propulsion Laboratory
     Pasadena, CA  91109   USA
     Information: http://ssd.jpl.nasa.gov/
     Connect    : telnet://ssd.jpl.nasa.gov:6775  (via browser)
                  telnet ssd.jpl.nasa.gov 6775    (via command-line)
     Author     : Jon.Giorgini@jpl.nasa.gov
*******************************************************************************

divitiacus · Post #4by **divitiacus** » 23.03.2007, 20:06

i tried this add on from the OP and its way off, does anyone have an acurate path of this asteriod?

Post #5by **t00fri** » 23.03.2007, 20:21

divitiacus wrote:i tried this add on from the OP and its way off, does anyone have an acurate path of this asteriod?

WHICH addon from WHICH OP?

Who is the OP?

Sorry but some Europeans are rather slow with understanding undefined acronyms...

Bye Fridger

Post #6by **selden** » 23.03.2007, 21:46

Often OP is used on Web forums to mean "Original Post" or "Original Poster" -- the first article in a thread or its author.

In this case it was "starfleetengineer", and he wrote

This should be "taken with a grain of salt" as it is based on the data published at the WIKI page for Apothis, so is likely to be inaccurate or out of date.

A reasonably accurate xyz trajectory should be available from JPL's Horizons ephemeris service and can be obtained by using its e'mail interface.

Post #7by **selden** » 23.03.2007, 22:08

Horizons has these Keplerian orbital parameters for Apophis:

Code: Select all

JPL/HORIZONS              99942 Apophis (2004 MN4)         2007-Mar-23 14:47:56
Rec #: 99942 (+COV)   Soln.date: 2006-Sep-01_00:50:35    # obs: 738 (2004-2006)

FK5/J2000.0 helio. ecliptic osc. elements (AU, DAYS, DEG, period=Julian yrs):

  EPOCH=  2453442.5 ! 2005-Mar-13.00 (CT)         Residual RMS= .30901
    EC= .191054853916459   QR= .7461531666439291  TP= 2453600.734981114
    OM= 204.4721548004914  W= 126.3839706419199   IN= 3.330920734685656
    A= .9223779514054623   MA= 183.94709163245    ADIST= 1.098602736166995
    PER= .88587            N= 1.112604224         ANGMOM= .016216656
    DAN= 1.0023            DDN= .7982399999999999 L= 330.9024012
    B= 2.6810584                                  TP= 2005-Aug-18.2349811

Physical parameters (KM, SEC, rotational period in hours):
    GM= n.a.               RAD= .135              ROTPER= n.a.
    H= 19.7                G= .250                B-V= n.a.
                           ALBEDO= .330           STYP= n.a.

ASTEROID comments:
1: soln ref.= JPL#139, PHA  OCC=0       radar( 2 delay, 5 Dop.)
2: source=ORB

Which translates into this SSC

Code: Select all

"99942 Apophis" "Sol" {
   Class "asteroid"
   Mesh "asteroid.cms"
   Texture "asteroid.*"

   Radius 0.135

   EllipticalOrbit {
      Epoch         2453442.5 # 2005-Mar-13.00 (CT)
      MeanAnomaly       183.94709163245

      SemiMajorAxis       0.9223779514054623
      Period              0.88587 

      Eccentricity        0.191054853916459
      Inclination         3.330920734685656
      AscendingNode     204.4721548004914
      ArgOfPericenter   126.3839706419199
   }

   Albedo 0.33
}

Of course, this does not take into account the changes in the orbit due to gravitational effects between now and the next close call.

It is left as an excercise for the student to obtain the xyz trajectory from Horizons and translate it for use with Celestia.

Post #8by **t00fri** » 23.03.2007, 22:40

selden wrote:Often OP is used on Web forums to mean "Original Post" or "Original Poster" -- the first article in a thread or its author.

+++++++++++++++++++
Sorry I don't "traffic" in WEB forums...
+++++++++++++++++++

I could easily come up with "techno talking" that few would understand... So my plea is to leave acronyms at home. In Europe acronyms are far less popular than in the US.

Thanks anyway for your explanation.

Bye Fridger

Chuft-Captain · Post #9by **Chuft-Captain** » 23.03.2007, 22:59

fridger,

Bookmark this website: http://www.acronymfinder.com/af-query.a ... ring=exact

divitiacus · Post #10by **divitiacus** » 23.03.2007, 23:14

yea i took that horizons link earlier and entered the data and got a more accurate model

im curious, does anyone think it possible to somehow get google earth as the skin for earth in this program?

Post #11by **t00fri** » 23.03.2007, 23:17

Chuft-Captain wrote:fridger,

Bookmark this website: http://www.acronymfinder.com/af-query.a ... ring=exact

No need:

While DESY only has 3 meanings OP has 91!

And incidentally, I always write out in my professional emails the full address, despite everyone of my correspondents would surely know what DESY means. It's just BAD writing style.

Bye Fridger

Chuft-Captain · Post #12by **Chuft-Captain** » 24.03.2007, 02:52

t00fri wrote:
Chuft-Captain wrote:fridger,

Bookmark this website: http://www.acronymfinder.com/af-query.a ... ring=exact

No need:

While DESY only has 3 meanings OP has 91!

And incidentally, I always write out in my professional emails the full address, despite everyone of my correspondents would surely know what DESY means. It's just BAD writing style.

Bye Fridger

Well of course OP would have more meanings as it has only 2 characters... :lol:

desy = 3
des = 62
de = 91
d = 110

[url=http://www.acronymfinder.com/acronym.aspx?rec={B6F61D72-56FD-11D5-8382-00C04FC2C2BF}]EMFJI[/url]...SICR... TTP

:twisted: