IOTA/IOTA-ES occultation update for (3313) Mendel / TYC 5720-00166-1 event on 2007 Aug 02, 17:37 UT Visible from Australia Summary ------- On 2007 Aug 02 UT, the 11 km diameter asteroid (3313) Mendel will occult a 9.5 mag star in the constellation Sagittarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.0 mag to 15.5 mag (the magnitude of the asteroid) for at most 1.4 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: 10 * date and approx. time of event: 2007 Aug 02, 17:23 - 2007 Aug 02, 17:51 UT * magnitude of target star: 9.5 * magnitude drop [mag]: 6.0 * estimated maximum duration [s]: 1.4 * Moon: 83 % sunlit, 70° distance * Sun: 157° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 6.68 * 1 sigma uncertainty interval [seconds]: +/- 11.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .097 +/- .068) * 1 sigma uncertainty ellipse (major, minor, PA): ( .099", .064", 72° ) * approx speed of asteroid's shadow [km/s]: 7.6603 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5720-00166-1 by 3313 Mendel on 2007 Aug 02 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 - 17 0 0 10 28 7 17 51 34 0 104 23 10 31 12 10 25 3 11 12 19 9 43 56 - 16 0 0 10 13 1 17 51 34 1 104 22 10 16 6 10 9 56 10 57 15 9 28 47 - 15 0 0 9 57 43 17 51 33 2 105 21 10 0 48 9 54 38 10 41 59 9 13 28 - 14 0 0 9 42 14 17 51 33 3 105 20 9 45 19 9 39 9 10 26 31 8 57 56 - 13 0 0 9 26 33 17 51 32 4 105 19 9 29 39 9 23 28 10 10 53 8 42 14 - 12 0 0 9 10 42 17 51 31 5 105 18 9 13 48 9 7 37 9 55 4 8 26 21 - 11 0 0 8 54 41 17 51 29 6 105 17 8 57 46 8 51 36 9 39 4 8 10 18 - 10 0 0 8 38 30 17 51 27 7 105 16 8 41 35 8 35 24 9 22 55 7 54 5 - 9 0 0 8 22 8 17 51 25 8 105 15 8 25 14 8 19 3 9 6 35 7 37 42 - 8 0 0 8 5 38 17 51 23 9 106 14 8 8 44 8 2 32 8 50 6 7 21 10 - 7 0 0 7 48 58 17 51 20 10 106 13 7 52 4 7 45 52 8 33 28 7 4 29 - 6 0 0 7 32 10 17 51 18 11 106 12 7 35 16 7 29 4 8 16 42 6 47 39 - 5 0 0 7 15 13 17 51 15 12 106 10 7 18 19 7 12 7 7 59 46 6 30 40 - 4 0 0 6 58 8 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-12 48 32 -14 15 59 159 0 0 -13 20 6 17 24 4 11 258 -34 -13 17 3 -13 23 9 -12 36 20 -14 3 52 160 0 0 -13 7 41 17 24 1 10 258 -33 -13 4 38 -13 10 44 -12 23 53 -13 51 29 161 0 0 -12 55 0 17 23 59 9 258 -32 -12 51 57 -12 58 3 -12 11 9 -13 38 50 162 0 0 -12 42 4 17 23 57 8 257 -31 -12 39 1 -12 45 7 -11 58 11 -13 25 57 163 0 0 -12 28 53 17 23 55 7 257 -30 -12 25 49 -12 31 56 -11 44 57 -13 12 48 164 0 0 -12 15 26 17 23 53 6 257 -29 -12 12 23 -12 18 30 -11 31 29 -12 59 24 165 0 0 -12 1 45 17 23 52 5 257 -28 -11 58 41 -12 4 49 -11 17 45 -12 45 45 166 0 0 -11 47 49 17 23 51 4 257 -27 -11 44 45 -11 50 53 -11 3 47 -12 31 51 167 0 0 -11 33 39 17 23 50 3 256 -26 -11 30 34 -11 36 43 -10 49 34 -12 17 43 168 0 0 -11 19 14 17 23 49 2 256 -25 -11 16 9 -11 22 18 -10 35 6 -12 3 20 169 0 0 -11 4 34 17 23 49 1 256 -24 -11 1 30 -11 7 39 -10 20 25 -11 48 43 Data for the target star ------------------------ * name: TYC 5720-00166-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 15 31.5052 DE: -13 55 05.921 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .017 ) * V mag [mag]: 9.5 * B mag [mag]: 9.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3313) Mendel approx. diameter [km]: 11 approx. diameter ["]: .011 distance from Earth [AU]: 1.39600 * orbital information: orbit source: Preston date of fit: 2007 Jul 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 548 number of rejected observations: 11 time covered by the observations: 1972 May 11 - 2007 Jun 29 1 sigma uncertainty ellipse (major, minor, PA): 0.098, 0.062, 72° remarks: * orbital elements for (3313) Mendel : Mean anomaly = 30.93573155 deg Arg. of pericenter = 345.49922414 deg Long. of node = 272.44121221 deg Inclination = 11.41320263 deg Eccentricity = 0.13366079 Semimajor axis = 2.65328549 AU Perihelion dist = 2.29864526 AU Mag: H = 12.10, G = 0.15 Epoch of elements : MJD 54314.73500000 TDT (2007 Aug 02.735) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 02 3313 Mendel 17h 37.7m UT 9.5 19 15 31.505-13 55 5.92TYC 5720-00166-1 9.5 15.5 11 1.4 1.396 -1.835 5.17 73.521 -13.920 -82.85 17.72 17.6283 -.00106 -.00296 -4.24492 0.82153 0.00201 -0.00047 2000 29.85592012007 729.00000345.499224272.441212 11.4132030.133660792.653285492.2986452612.35 0.15 RATE 2.2804897 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.099 0.064 72.5 7.680 0.073 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 29, 02:15 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org