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Asteroid (99942) Apophis (orig:2004 MN4)
Posted: 24.02.2007, 01:49
by starfleetengineer
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WIKI page for Apothis, so is likely to be inaccurate or out of date.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.
Posted: 24.02.2007, 05:13
by Reiko
cool!
Posted: 24.02.2007, 07:21
by LordFerret
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
*******************************************************************************
Posted: 23.03.2007, 20:06
by divitiacus
i tried this add on from the OP and its way off, does anyone have an acurate path of this asteriod?
Posted: 23.03.2007, 20:21
by t00fri
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
Posted: 23.03.2007, 21:46
by selden
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.
Posted: 23.03.2007, 22:08
by selden
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.
Posted: 23.03.2007, 22:40
by t00fri
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
Posted: 23.03.2007, 22:59
by Chuft-Captain
Posted: 23.03.2007, 23:14
by divitiacus
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?
Posted: 23.03.2007, 23:17
by t00fri
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
Posted: 24.03.2007, 02:52
by Chuft-Captain
t00fri wrote: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...
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
