IOTA/IOTA-ES occultation update for (393) Lampetia / TYC 5657-00038-1 event on 2009 Apr 06, 18:38 UT Visible from Summary ------- On 2009 Apr 06 UT, the 97 km diameter asteroid (393) Lampetia will occult a 11.2 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 1.4 mag to 12.2 mag (the magnitude of the asteroid) for at most 8.7 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: UCAC. The event at a glimpse ---------------------- * Rank: 94 * date and approx. time of event: 2009 Apr 06, 18:29 - 2009 Apr 06, 18:42 UT * magnitude of target star: 11.2 * magnitude drop [mag]: 1.4 * estimated maximum duration [s]: 8.7 * Moon: 91 % sunlit, 98° distance * Sun: 118° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 99 * 1 sigma uncertainty interval [path widths]: +/- 0.45 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .048 +/- .034) * 1 sigma uncertainty ellipse (major, minor, PA): ( .048", .034", 85° ) * approx speed of asteroid's shadow [km/s]: 11.1289 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5657-00038-1 by 393 Lampetia on 2009 Apr 6 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 170 0 0 - 5 57 58 18 42 41 62 250 -1 - 6 35 27 - 5 20 37 - 7 9 17 - 4 47 5 169 0 0 - 6 56 9 18 42 28 63 251 -2 - 7 33 45 - 6 18 41 - 8 7 41 - 5 45 3 168 0 0 - 7 54 34 18 42 15 65 252 -3 - 8 32 16 - 7 17 0 - 9 6 18 - 6 43 16 167 0 0 - 8 53 11 18 42 2 66 254 -4 - 9 30 58 - 8 15 31 -10 5 5 - 7 41 43 166 0 0 - 9 51 55 18 41 49 67 255 -5 -10 29 47 - 9 14 10 -11 3 58 - 8 40 18 165 0 0 -10 50 44 18 41 35 68 257 -6 -11 28 39 -10 12 55 -12 2 54 - 9 38 59 164 0 0 -11 49 33 18 41 22 70 259 -7 -12 27 31 -11 11 41 -13 1 48 -10 37 42 163 0 0 -12 48 19 18 41 8 71 262 -9 -13 26 20 -12 10 24 -14 0 39 -11 36 24 162 0 0 -13 46 58 18 40 54 72 264 -10 -14 25 0 -13 9 2 -14 59 21 -12 35 0 161 0 0 -14 45 27 18 40 41 73 268 -11 -15 23 30 -14 7 31 -15 57 51 -13 33 28 160 0 0 -15 43 43 18 40 27 74 271 -12 -16 21 46 -15 5 47 -16 56 7 -14 31 44 159 0 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57 18 29 15 0 112 -33 -50 1 58 -49 3 59 -50 28 8 .. .. .. Uncertainty in time = +/- 5 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 5657-00038-1 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 14 22.0023 DE: -14 42 34.522 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .030, .030 ) * V mag [mag]: 11.2 * B mag [mag]: 12.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (393) Lampetia approx. diameter [km]: 97 approx. diameter ["]: .087 distance from Earth [AU]: 1.54400 * orbital information: orbit source: Preston date of fit: 2008 Mar 19 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): 0.037, 0.017, 82° remarks: * orbital elements for (393) Lampetia : Mean anomaly = 323.79293231 deg Arg. of pericenter = 91.16409623 deg Long. of node = 212.48297300 deg Inclination = 14.87445700 deg Eccentricity = 0.33205006 Semimajor axis = 2.77735207 AU Perihelion dist = 1.85513216 AU Mag: H = 8.39, G = 0.15 Epoch of elements : MJD 54927.77700000 TDT (2009 Apr 06.777) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Apr 6 393 Lampetia 18h 38.6m UT 11.2 17 14 22.002-14 42 34.52TYC 5657-00038-1 12.7 12.2 97 8.7 1.544 1.884 23.08 143.7574 -14.716 -99.07 6.72 18.6435 0.12757 -0.14995 4.80055 4.05113 -0.00478 0.00001 2000 322.1368962009 330.00000 91.164096212.482973 14.8744570.33205006 2.7773521 1.8551321 8.4 5.00.15 RATE 2.1294020 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.048 0.034 85 1.45 0.039 0 54545.5020090406_0038-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 06:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org