Ra and dec, delta 5sec

Object Data Page

Results

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Ephemeris / WWW_USER Sat Jan 16 07:53:56 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 12:45:00.0000 UT

Stop time : A.D. 2010-Jan-13 12:47:00.0000 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 12:45:00.000 01 53 02.70 +12 41 34.1 14.50 0.00086251239914 -0.0294868 97.6727 /T 82.2778

2010-Jan-13 12:45:03.772 01 52 58.64 +12 41 25.0 14.50 0.00086251169103 -0.0266825 97.6563 /T 82.2942

2010-Jan-13 12:45:08.531 01 52 53.53 +12 41 13.5 14.50 0.00086251089834 -0.0231438 97.6356 /T 82.3148

2010-Jan-13 12:45:13.290 01 52 48.42 +12 41 02.0 14.50 0.00086251021827 -0.0196054 97.6150 /T 82.3355

2010-Jan-13 12:45:18.049 01 52 43.30 +12 40 50.5 14.50 0.00086250965083 -0.0160672 97.5943 /T 82.3561

2010-Jan-13 12:45:22.808 01 52 38.19 +12 40 39.0 14.50 0.00086250919528 -0.0125292 97.5737 /T 82.3768

2010-Jan-13 12:45:27.566 01 52 33.08 +12 40 27.4 14.50 0.00086250885369 -0.0089914 97.5530 /T 82.3974

2010-Jan-13 12:45:32.324 01 52 27.97 +12 40 15.9 14.50 0.00086250862395 -0.0054539 97.5324 /T 82.4181

2010-Jan-13 12:45:37.082 01 52 22.86 +12 40 04.4 14.50 0.00086250850674 -0.0019166 97.5117 /T 82.4387

2010-Jan-13 12:45:41.839 01 52 17.75 +12 39 52.9 14.50 0.00086250850204 0.0016205 97.4911 /T 82.4593

2010-Jan-13 12:45:46.596 01 52 12.63 +12 39 41.3 14.50 0.00086250860981 0.0051574 97.4704 /T 82.4800

2010-Jan-13 12:45:51.353 01 52 07.53 +12 39 29.8 14.50 0.00086250883005 0.0086941 97.4498 /T 82.5006

2010-Jan-13 12:45:56.109 01 52 02.42 +12 39 18.2 14.50 0.00086250916273 0.0122306 97.4292 /T 82.5213

2010-Jan-13 12:46:00.866 01 51 57.31 +12 39 06.7 14.51 0.00086250960785 0.0157669 97.4085 /T 82.5419

2010-Jan-13 12:46:05.622 01 51 52.20 +12 38 55.1 14.51 0.00086251016538 0.0193030 97.3879 /T 82.5626

2010-Jan-13 12:46:10.378 01 51 47.09 +12 38 43.6 14.51 0.00086251083531 0.0228390 97.3672 /T 82.5832

2010-Jan-13 12:46:15.133 01 51 41.98 +12 38 32.0 14.51 0.00086251161763 0.0263748 97.3466 /T 82.6038

2010-Jan-13 12:46:19.889 01 51 36.87 +12 38 20.4 14.51 0.00086251251232 0.0299104 97.3259 /T 82.6245

2010-Jan-13 12:46:24.644 01 51 31.77 +12 38 08.8 14.51 0.00086251351937 0.0334459 97.3053 /T 82.6451

2010-Jan-13 12:46:29.399 01 51 26.66 +12 37 57.2 14.51 0.00086251463877 0.0369812 97.2847 /T 82.6657

2010-Jan-13 12:46:34.154 01 51 21.55 +12 37 45.6 14.51 0.00086251587050 0.0405164 97.2640 /T 82.6864

2010-Jan-13 12:46:38.909 01 51 16.45 +12 37 34.0 14.51 0.00086251721456 0.0440515 97.2434 /T 82.7070

2010-Jan-13 12:46:43.663 01 51 11.34 +12 37 22.4 14.51 0.00086251867096 0.0475864 97.2228 /T 82.7276

2010-Jan-13 12:46:48.418 01 51 06.24 +12 37 10.8 14.51 0.00086252023965 0.0511212 97.2021 /T 82.7483

2010-Jan-13 12:46:53.172 01 51 01.13 +12 36 59.2 14.51 0.00086252192066 0.0546559 97.1815 /T 82.7689

2010-Jan-13 12:46:57.926 01 50 56.03 +12 36 47.6 14.51 0.00086252371396 0.0581905 97.1609 /T 82.7895

$$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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