Numbers generated using the Solar System Dynamics Group, Horizons On-Line Ephemeris System at: http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=mb&sstr=8 Ephemeris Type: OBSERVER Target Body: Neptune Barycenter [8] Observer Location: Geocentric [500] QUANTITIES=1,20,23,29 Key: ==== delta deldot = A positive "deldot" means the target center is moving away from the observer. 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; If negative, the target center is behind the Sun /T indicates target trails Sun (evening sky) /L indicates target leads Sun (morning sky) (In this case, S-O-T = Sun-Earth-Neptune angle; where 180 = opposition, 0 = Conjunction) Cnst = Constellation ID * = listed on Neptune Wikipedia article (subsection: Observation) since 10 September 2004. ** = listed on Neptune Wikipedia article (subsection: Observation) since 9 February 2007. (These dates do not appear to match the discovery date RA 22 01 / Dec -12 39 very well.) ** Neptune ** Date__(UT)__HR:MN R.A._(ICRF/J2000.0)_DEC delta (AU) deldot KM/S S-O-T /r Cnst 1845-Sep-23 00:00 21 52 46.86 -13 22 29.6 29.2084199576160 17.7552317 143.8251 /T Cap (See * and ** entries) 1846-Feb-15 00:00 22 00 32.49 -12 41 08.0 31.0068910117967 0.1286555 0.5749 /L Aqr (Conjunction) 1846-Aug-20 00:00 22 04 54.71 -12 21 42.0 29.0011894072862 0.1938266 179.4285 /L Aqr (Opposition) 1846-Sep-23 00:00 22 01 35.69 -12 39 54.4 29.1718102079027 16.7265035 146.3266 /T Aqr (Discovery Date) <== REFERENCE POINT 2009-Apr-11 00:00 21 52 28.15 -13 17 37.9 30.5894102206372 -24.0594923 55.3831 /L Cap* 2009-Jul-17 00:00 21 52 35.13 -13 19 20.5 29.1560824218148 -15.1045352 148.6739 /L Cap* 2009-Aug-17 00:00 21 49 31.50 -13 35 47.3 29.0158748177736 -0.1616191 179.0424 /L Cap (Opposition) 2010-Feb-07 00:00 21 52 29.00 -13 20 36.0 31.0003433949618 4.3002198 7.7765 /T Cap* (near conjunction) 2010-Feb-15 00:00 21 53 39.48 -13 14 30.8 31.0109269376095 0.2739738 0.4234 /T Cap (Conjunction; see 1846) 2010-Apr-19 00:00 22 01 34.84 -12 33 27.7 30.5012576411481 -25.5083198 60.6273 /L Aqr (Good RA/DEC) 2010-Jul-21 00:00 22 01 04.76 -12 38 34.9 29.1338341096144 -14.4507005 150.0719 /L Aqr (Pre-opposition / Good RA/DEC) 2010-Aug-20 00:00 21 58 06.74 -12 54 58.6 29.0060792427173 0.0949608 179.3599 /L Cap (Opposition; see 1846) 2010-Sep-23 00:00 21 54 46.75 -13 12 53.0 29.1744057240735 16.5963927 146.5703 /T Cap (Discovery Sun-Earth-Nept angle) 2010-Nov-07 00:00 21 52 43.88 -13 23 30.5 29.8032792910654 29.3173907 101.4451 /T Cap** 2011-Feb-17 00:00 22 02 11.80 -12 33 02.1 31.0003709674113 0.5032376 0.6306 /T Aqr (Conjunction) 2011-Jul-12 00:00 22 10 34.20 -11 50 45.1 29.2355348257667 -19.1728866 138.7934 /L Aqr (Heliocentric Birthday; see below) 2011-Aug-23 00:00 22 06 39.28 -12 13 06.6 28.9952632639746 0.3128290 179.4459 /L Aqr (Opposition) 2011-Sep-26 00:00 22 03 20.76 -12 31 20.0 29.1681941200172 16.8250808 146.0857 /T Aqr (Discovery Sun-Earth-Nept angle) 2011-Oct-21 00:00 22 01 45.80 -12 39 48.3 29.4798959687686 25.6737083 121.0014 /T Aqr (Good RA/DEC) 2011-Nov-27 00:00 22 01 40.39 -12 39 59.0 30.0934245656863 29.7457200 83.8444 /T Aqr (Good RA/DEC) Observer Location: Sun (body center) [500@10] (Heliocentric) QUANTITIES=1,20,29 Date__(UT)__HR:MN R.A._(ICRF/J2000.0)_DEC delta (AU) deldot KM/S Cnst 1846-Sep-23 00:00 22 05 39.10 -12 16 54.3 30.0114878939835 -0.0576715 Aqr (Discovery Date) 2011-Jul-12 00:00 22 05 39.22 -12 16 55.0 30.0079478455979 -0.0545865 Aqr (1st Complete Orbit!) 2176-May-04 00:00 22 05 39.33 -12 16 56.6 30.0109537617283 -0.0521759 Aqr File created: 16-Nov-2007