IOTA/IOTA-ES occultation update for (393) Lampetia / HIP 83738 event on 2009 Jun 09, 16:56 UT Visible from Summary ------- On 2009 Jun 09 UT, the 97 km diameter asteroid (393) Lampetia will occult a 6.4 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.2 mag to 10.6 mag (the magnitude of the asteroid) for at most 12.1 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 98 * date and approx. time of event: 2009 Jun 09, 16:42 - 2009 Jun 09, 17:07 UT * magnitude of target star: 6.4 * magnitude drop [mag]: 4.2 * estimated maximum duration [s]: 12.1 * Moon: 97 % sunlit, 34° distance * Sun: 159° distance * rough path description: Additional comments ------------------- 20" double star The occultation path -------------------- * approximate projected width [km]: 99 * 1 sigma uncertainty interval [path widths]: +/- 0.36 * 1 sigma uncertainty interval [seconds]: +/- 3.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .058 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .058", .024", 82° ) * approx speed of asteroid's shadow [km/s]: 8.0104 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 83738 by 393 Lampetia on 2009 Jun 9 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 ' " Longitude Longitude Longitude Longitude Latitude Latitude Latitude Latitude 44 0 0 50 36 26 17 7 54 19 117 0 51 5 36 50 7 21 51 26 38 49 46 26 45 0 0 50 20 27 17 7 51 19 118 -1 50 49 44 49 51 14 51 10 52 49 30 14 46 0 0 50 3 55 17 7 48 20 119 -1 50 33 20 49 34 34 50 54 33 49 13 28 47 0 0 49 46 49 17 7 44 21 119 -2 50 16 22 49 17 19 50 37 41 48 56 8 48 0 0 49 29 8 17 7 41 21 120 -3 49 58 50 48 59 31 50 20 15 48 38 13 49 0 0 49 10 53 17 7 37 22 121 -3 49 40 43 48 41 7 50 2 14 48 19 44 50 0 0 48 52 3 17 7 33 23 122 -4 49 22 1 48 22 9 49 43 39 48 0 39 51 0 0 48 32 37 17 7 29 23 122 -5 49 2 44 48 2 34 49 24 28 47 40 59 52 0 0 48 12 35 17 7 25 24 123 -6 48 42 51 47 42 24 49 4 42 47 20 42 53 0 0 47 51 57 17 7 21 25 124 -6 48 22 22 47 21 36 48 44 19 46 59 48 54 0 0 47 30 42 17 7 16 26 125 -7 48 1 16 47 0 12 48 23 19 46 38 17 55 0 0 47 8 48 17 7 11 26 125 -8 47 39 32 46 38 10 48 1 42 46 16 9 56 0 0 46 46 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-27 22 8 -28 16 49 -27 2 24 -28 36 27 -179 0 0 -27 59 15 16 43 16 16 277 -26 -27 31 56 -28 26 31 -27 12 15 -28 46 7 -178 0 0 -28 8 22 16 43 13 15 276 -25 -27 41 7 -28 35 35 -27 21 27 -28 55 8 -177 0 0 -28 16 51 16 43 10 14 276 -24 -27 49 39 -28 44 1 -27 30 1 -29 3 33 -176 0 0 -28 24 43 16 43 7 13 275 -23 -27 57 33 -28 51 50 -27 37 57 -29 11 20 -175 0 0 -28 31 57 16 43 4 12 275 -22 -28 4 49 -28 59 2 -27 45 15 -29 18 30 -174 0 0 -28 38 33 16 43 2 11 274 -22 -28 11 28 -29 5 36 -27 51 55 -29 25 3 -173 0 0 -28 44 32 16 43 0 10 274 -21 -28 17 29 -29 11 33 -27 57 58 -29 30 58 -172 0 0 -28 49 54 16 42 57 10 273 -20 -28 22 52 -29 16 53 -28 3 22 -29 36 17 -171 0 0 -28 54 38 16 42 55 9 273 -19 -28 27 38 -29 21 36 -28 8 9 -29 40 58 -170 0 0 -28 58 45 16 42 54 8 272 -18 -28 31 46 -29 25 41 -28 12 18 -29 45 3 -169 0 0 -29 2 15 16 42 52 7 272 -18 -28 35 17 -29 29 10 -28 15 50 -29 48 31 -168 0 0 -29 5 7 16 42 51 6 271 -17 -28 38 10 -29 32 1 -28 18 43 -29 51 22 -167 0 0 -29 7 22 16 42 49 5 271 -16 -28 40 25 -29 34 16 -28 21 0 -29 53 36 -166 0 0 -29 9 0 16 42 48 4 270 -15 -28 42 3 -29 35 53 -28 22 38 -29 55 13 -165 0 0 -29 10 0 16 42 48 3 270 -14 -28 43 4 -29 36 53 -28 23 38 -29 56 13 -164 0 0 -29 10 23 16 42 47 3 269 -13 -28 43 26 -29 37 16 -28 24 1 -29 56 35 -163 0 0 -29 10 8 16 42 47 2 269 -13 -28 43 11 -29 37 1 -28 23 46 -29 56 21 -162 0 0 -29 9 15 16 42 46 1 269 -12 -28 42 18 -29 36 9 -28 22 52 -29 55 30 Uncertainty in time = +/- 5 secs [Prediction of 2008 Nov 16.0] Data for the target star ------------------------ * name: HIP 83738 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 06 52.9806 DE: -01 39 22.520 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .012, .007 ) * V mag [mag]: 6.4 * B mag [mag]: 6.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (393) Lampetia approx. diameter [km]: 97 approx. diameter ["]: .131 distance from Earth [AU]: 1.02400 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 689 number of rejected observations: 112 time covered by the observations: 1903 Sep 21 - 2008 Feb 14 1 sigma uncertainty ellipse (major, minor, PA): 0.057, 0.023, 82° remarks: * orbital elements for (393) Lampetia : Mean anomaly = 337.40908803 deg Arg. of pericenter = 91.16491250 deg Long. of node = 212.48260642 deg Inclination = 14.87432799 deg Eccentricity = 0.33210721 Semimajor axis = 2.77753882 AU Perihelion dist = 1.85509814 AU Mag: H = 8.39, G = 0.15 Epoch of elements : MJD 54991.70600000 TDT (2009 Jun 09.706) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 9 393 Lampetia 16h 55.7m UT 6.4 17 6 52.981- 1 39 22.52HIP 83738 6.6 10.6 97 12.1 1.024 -1.931 25.89 104.6031 -1.663 -74.09 22.98 16.9283 0.14809 0.16552 -3.36938 3.01483 0.00008 -0.00184 2000 337.0458492009 6 8.00000 91.164913212.482606 14.8743280.33210721 2.7775388 1.8550982 8.4 5.00.15 RATE 2.1291870 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.058 0.024 82 1.36 0.047 0 54786.5020090609__83738 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 16, 17:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org