IOTA/IOTA-ES occultation update for (283) Emma / 2UCAC 20725814 event on 2008 Jul 08, 17:27 UT Visible from Australia, Africa Summary ------- On 2008 Jul 08 UT, the 148 km diameter asteroid (283) Emma will occult a 13.0 mag star in the constellation Sagittarius for observers along a path across Australia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.6 mag to 12.6 mag (the magnitude of the asteroid) for at most 12.7 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 94 * date and approx. time of event: 2008 Jul 08, 17:18 - 2008 Jul 08, 17:37 UT * magnitude of target star: 13.0 * magnitude drop [mag]: 0.6 * estimated maximum duration [s]: 12.7 * Moon: 35 % sunlit, 101° distance * Sun: 173° distance * rough path description: Australia, Africa The occultation path -------------------- * approximate projected width [km]: 148 * 1 sigma uncertainty interval [path widths]: +/- 0.45 * 1 sigma uncertainty interval [seconds]: +/- 5.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .052 +/- .049) * 1 sigma uncertainty ellipse (major, minor, PA): ( .052", .049", 88° ) * approx speed of asteroid's shadow [km/s]: 11.7070 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 20725814 by 283 Emma on 2008 Jul 8 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 10 0 0 7 1 12 17 37 1 4 118 0 7 46 46 6 15 40 8 27 50 5 34 44 11 0 0 6 29 26 17 37 0 5 118 -1 7 15 1 5 43 53 7 56 6 5 2 56 12 0 0 5 57 35 17 36 59 6 118 -2 6 43 11 5 12 2 7 24 17 4 31 4 13 0 0 5 25 41 17 36 58 7 118 -3 6 11 18 4 40 7 6 52 23 3 59 9 14 0 0 4 53 44 17 36 56 8 119 -5 5 39 21 4 8 11 6 20 27 3 27 12 15 0 0 4 21 46 17 36 55 9 119 -6 5 7 23 3 36 12 5 48 29 2 55 14 16 0 0 3 49 47 17 36 53 11 119 -7 4 35 23 3 4 13 5 16 29 2 23 15 17 0 0 3 17 48 17 36 51 12 119 -8 4 3 24 2 32 15 4 44 29 1 51 17 18 0 0 2 45 50 17 36 49 13 119 -9 3 31 25 2 0 18 4 12 29 1 19 21 19 0 0 2 13 54 17 36 46 14 119 -10 2 59 28 1 28 22 3 40 31 0 47 26 20 0 0 1 42 0 17 36 43 15 119 -11 2 27 33 0 56 30 3 8 36 0 15 35 21 0 0 1 10 10 17 36 41 16 119 -12 1 55 42 0 24 42 2 36 43 - 0 16 12 22 0 0 0 38 25 17 36 38 17 119 -13 1 23 55 - 0 7 2 2 4 55 - 0 47 54 23 0 0 0 6 45 17 36 34 18 119 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27 29 - 8 17 57 -178 0 0 - 6 23 10 17 18 58 7 243 -11 - 5 38 13 - 7 8 5 - 4 57 42 - 7 48 28 -177 0 0 - 5 53 16 17 18 57 6 243 -10 - 5 8 14 - 6 38 15 - 4 27 40 - 7 18 42 -176 0 0 - 5 23 6 17 18 56 5 243 -9 - 4 37 59 - 6 8 9 - 3 57 21 - 6 48 40 -175 0 0 - 4 52 40 17 18 55 4 243 -8 - 4 7 30 - 5 37 47 - 3 26 48 - 6 18 22 -174 0 0 - 4 22 0 17 18 55 2 243 -7 - 3 36 46 - 5 7 11 - 2 56 0 - 5 47 49 -173 0 0 - 3 51 6 17 18 54 1 243 -6 - 3 5 48 - 4 36 21 - 2 24 59 - 5 17 3 -172 0 0 - 3 20 0 17 18 54 0 243 -5 .. .. .. - 4 5 18 .. .. .. - 4 46 3 Uncertainty in time = +/- 6 secs [Prediction of 2008 Jul 3.0] Data for the target star ------------------------ * name: 2UCAC 20725814 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 52 29.5779 DE: -27 21 26.694 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .047, .047 ) * V mag [mag]: 13.0 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (283) Emma approx. diameter [km]: 148 approx. diameter ["]: .110 distance from Earth [AU]: 1.85000 * orbital information: orbit source: Preston date of fit: 2008 Jul 02 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 833 number of rejected observations: 101 time covered by the observations: 1913 Sep 25 - 2008 Jun 12 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.016, 78° remarks: * orbital elements for (283) Emma : Mean anomaly = 301.73318388 deg Arg. of pericenter = 53.28703878 deg Long. of node = 304.42128240 deg Inclination = 7.99638117 deg Eccentricity = 0.15121617 Semimajor axis = 3.04819855 AU Perihelion dist = 2.58726164 AU Mag: H = 8.46, G = 0.15 Epoch of elements : MJD 54655.72800000 TDT (2008 Jul 08.728) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 8 283 Emma 17h 28.0m UT 13.0 18 52 29.578-27 21 26.692UCAC 20725814 0.0 12.6 148 12.7 1.850 -2.341 3.70 94.0928 -27.358 -80.69 22.37 17.4662 0.00633 0.05429 -6.56182 0.77774 0.00049 0.00048 2000 300.6723632008 7 3.00000 53.287039304.421282 7.9963810.15121617 3.0481986 2.5872616 8.7 5.00.15 RATE 1.8519920 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.052 0.049 88 1.45 0.049 1 12 510 54650.5020080708_725814 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jul 03, 00:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org