Noa

Object Data Page

Results

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Ephemeris / WWW_USER Sat Jan 16 08:23:46 2010 Pasadena, USA / Horizons

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Target body name: (2010 AL30) {source: JPL#22}

Center body name: Earth (399) {source: DE405}

Center-site name: GEOCENTRIC

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Start time : A.D. 2010-Jan-13 12:31:00.0000 UT

Stop time : A.D. 2010-Jan-13 12:33:00.0000 UT

Step-size : 60 arcsec (VARIABLE TIME)

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Target pole/equ : No model available

Target radii : (unavailable)

Center geodetic : 0.00000000,0.00000000,0.0000000 {E-lon(deg),Lat(deg),Alt(km)}

Center cylindric: 0.00000000,0.00000000,0.0000000 {E-lon(deg),Dxy(km),Dz(km)}

Center pole/equ : High-precision EOP model {East-longitude +}

Center radii : 6378.1 x 6378.1 x 6356.8 km {Equator, meridian, pole}

Target primary : Sun {source: DE405}

Interfering body: MOON (Req= 1737.400) km {source: DE405}

Deflecting body : Sun, EARTH {source: DE405}

Deflecting GMs : 1.3271E+11, 3.9860E+05 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

Atmos refraction: NO (AIRLESS)

RA format : HMS

Time format : CAL

EOP file : eop.100115.p100408

EOP coverage : DATA-BASED 1962-JAN-20 TO 2010-JAN-15. PREDICTS-> 2010-APR-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 (>38.000=NO), Daylight (NO )

Table cut-offs 2: Solar Elongation ( 0.0,180.0=NO )

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Initial FK5/J2000.0 heliocentric ecliptic osculating elements (AU, DAYS, DEG):

EPOCH= 2455209.5 ! 2010-Jan-13.00 (CT) Residual RMS= .40358

EC= .3083875734758442 QR= .6938003308913113 TP= 2455280.13257531

OM= 113.0387579334109 W= 104.4962383965407 IN= 3.953951963454999

Asteroid physical parameters (KM, SEC, rotational period in hours):

GM= n.a. RAD= n.a. ROTPER= n.a.

H= 26.975 G= .150 B-V= n.a.

ALBEDO= n.a. STYP= n.a.

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Date__(UT)__HR:MN:SC.fff R.A._(ICRF/J2000.0)_DEC APmag delta deldot S-O-T /r S-T-O

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$$SOE

2010-Jan-13 12:31:00.000 02 08 05.83 +13 13 41.8 14.37 0.00086442942573 -0.6525628 101.3119 /T 78.6390

2010-Jan-13 12:31:03.789 02 08 01.76 +13 13 33.6 14.37 0.00086441293366 -0.6497649 101.2955 /T 78.6553

2010-Jan-13 12:31:08.750 02 07 56.43 +13 13 22.8 14.37 0.00086439144065 -0.6461001 101.2741 /T 78.6768

2010-Jan-13 12:31:13.711 02 07 51.10 +13 13 12.0 14.37 0.00086437007639 -0.6424363 101.2527 /T 78.6982

2010-Jan-13 12:31:18.669 02 07 45.77 +13 13 01.2 14.37 0.00086434884161 -0.6387736 101.2313 /T 78.7196

2010-Jan-13 12:31:23.626 02 07 40.45 +13 12 50.4 14.37 0.00086432773617 -0.6351120 101.2099 /T 78.7410

2010-Jan-13 12:31:28.580 02 07 35.12 +13 12 39.6 14.37 0.00086430675988 -0.6314515 101.1885 /T 78.7624

2010-Jan-13 12:31:33.533 02 07 29.80 +13 12 28.8 14.37 0.00086428591262 -0.6277921 101.1671 /T 78.7838

2010-Jan-13 12:31:38.484 02 07 24.48 +13 12 18.0 14.37 0.00086426519421 -0.6241338 101.1457 /T 78.8052

2010-Jan-13 12:31:43.433 02 07 19.16 +13 12 07.2 14.38 0.00086424460449 -0.6204766 101.1243 /T 78.8266

2010-Jan-13 12:31:48.380 02 07 13.85 +13 11 56.4 14.38 0.00086422414333 -0.6168205 101.1029 /T 78.8479

2010-Jan-13 12:31:53.326 02 07 08.53 +13 11 45.6 14.38 0.00086420381055 -0.6131654 101.0815 /T 78.8693

2010-Jan-13 12:31:58.270 02 07 03.22 +13 11 34.8 14.38 0.00086418360601 -0.6095115 101.0602 /T 78.8907

2010-Jan-13 12:32:03.211 02 06 57.91 +13 11 23.9 14.38 0.00086416352957 -0.6058586 101.0388 /T 78.9120

2010-Jan-13 12:32:08.151 02 06 52.60 +13 11 13.1 14.38 0.00086414358105 -0.6022068 101.0175 /T 78.9334

2010-Jan-13 12:32:13.090 02 06 47.29 +13 11 02.3 14.38 0.00086412376030 -0.5985560 100.9961 /T 78.9547

2010-Jan-13 12:32:18.026 02 06 41.99 +13 10 51.4 14.38 0.00086410406719 -0.5949064 100.9748 /T 78.9761

2010-Jan-13 12:32:22.961 02 06 36.69 +13 10 40.6 14.38 0.00086408450157 -0.5912578 100.9535 /T 78.9974

2010-Jan-13 12:32:27.894 02 06 31.38 +13 10 29.8 14.38 0.00086406506326 -0.5876102 100.9321 /T 79.0187

2010-Jan-13 12:32:32.825 02 06 26.08 +13 10 18.9 14.38 0.00086404575212 -0.5839637 100.9108 /T 79.0400

2010-Jan-13 12:32:37.754 02 06 20.79 +13 10 08.1 14.38 0.00086402656802 -0.5803183 100.8895 /T 79.0613

2010-Jan-13 12:32:42.682 02 06 15.49 +13 09 57.2 14.38 0.00086400751080 -0.5766739 100.8682 /T 79.0826

2010-Jan-13 12:32:47.608 02 06 10.19 +13 09 46.4 14.38 0.00086398858031 -0.5730306 100.8469 /T 79.1039

2010-Jan-13 12:32:52.532 02 06 04.90 +13 09 35.5 14.39 0.00086396977641 -0.5693883 100.8256 /T 79.1252

2010-Jan-13 12:32:57.455 02 05 59.61 +13 09 24.7 14.39 0.00086395109893 -0.5657470 100.8043 /T 79.1465

$$EOE

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Column meaning:

TIME

Prior to 1962, times are UT1. Dates thereafter are UTC. Any 'b' symbol in

the 1st-column denotes a B.C. date. First-column blank (" ") denotes an A.D.

date. Calendar dates prior to 1582-Oct-15 are in the Julian calendar system.

Later calendar dates are in the Gregorian system.

The uniform Coordinate Time scale is used internally. Conversion between

CT and the selected non-uniform UT output scale has not been determined for

UTC times after the next July or January 1st. The last known leap-second

is used over any future interval.

NOTE: "n.a." in output means quantity "not available" at the print-time.

R.A._(ICRF/J2000.0)_DEC =

J2000.0 astrometric right ascension and declination of target center.

Corrected for light-time. Units: HMS (HH MM SS.ff) and DMS (DD MM SS.f)

APmag =

Asteroid's approximate apparent visual magnitude by following definition:

APmag = H + 5*log10(delta) + 5*log10(r) - 2.5*log10((1-G)*phi1 + G*phi2).

In principle, accurate to ~ +/- 0.1 magnitude. For solar phase angles > 90 deg,

the error could exceed 1 magnitude. No values are output for phase angles

greater than 120 degrees, since the extrapolation error could be large and

unknown. Units: NONE

delta deldot =

Range ("delta") and range-rate ("delta-dot") of target center with respect

to the observer at the instant light seen by the observer at print-time would

have left the target center (print-time minus down-leg light-time); the

distance traveled by a light ray emanating from the center of the target and

recorded by the observer at print-time. "deldot" is a projection of the

velocity vector along this ray, the light-time-corrected line-of-sight from the

coordinate center, and indicates relative motion. A positive "deldot" means the

target center is moving away from the observer (coordinate center). A negative

"deldot" means the target center is moving toward the observer.

Units: AU and KM/S

S-O-T /r =

Sun-Observer-Target angle; target's apparent solar elongation seen from

observer location at print-time. If negative, the target center is behind

the Sun. Angular units: DEGREES.

The '/r' column is a Sun-relative code, output for observing sites

with defined rotation models only.

/T indicates target trails Sun (evening sky)

/L indicates target leads Sun (morning sky)

NOTE: The S-O-T solar elongation angle is the total separation in any

direction. It does not indicate the angle of Sun leading or trailing.

S-T-O =

Sun-Target-Observer (~ PHASE ANGLE) angle: the vertex angle at target center

formed by a vector to the apparent center of the Sun and a vector intersecting

the observer at print-time. This measurable angle is within 20 arcseconds

(0.006 deg) of the reduced PHASE ANGLE at observer's location at print time.

The difference is due to down-leg stellar aberration affecting measured target

position but not apparent solar illumination direction. When computing phase,

Horizons uses the true phase angle, not S-T-O, but the resulting difference

in illuminated fraction is less than 0.001%.

Units: DEGREES

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

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