IOTA/IOTA-ES occultation update for (899) Jokaste / TYC 5722-01583-1 event on 2012 Jul 24, 07:20 UT Visible from Brazil, Peru Summary ------- On 2012 Jul 24 UT, the 29 km diameter asteroid (899) Jokaste will occult a 10.3 mag star in the constellation Aquila for observers along a path across Brazil, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.7 mag to 14.0 mag (the magnitude of the asteroid) for at most 2.5 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: 40 * date and approx. time of event: 2012 Jul 24, 07:10 - 2012 Jul 24, 07:28 UT * geocentric midpoint of event [JD]: 2456132.80544167 * magnitude of target star: 10.3 * magnitude drop [mag]: 3.7 * estimated maximum duration [s]: 2.5 * Moon: 27 % sunlit, 108° distance * Sun: 164° distance * rough path description: Brazil, Peru The occultation path -------------------- * approximate projected width [km]: 29 * 1 sigma uncertainty interval [path widths]: +/- 1.64 * 1 sigma uncertainty interval [seconds]: +/- 4.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .041 +/- .038) * 1 sigma uncertainty ellipse (major, minor, PA): ( .042", .037", 76° ) * approx speed of asteroid's shadow [km/s]: 11.4351 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5722-01583-1 by 899 Jokaste on 2012 Jul 24 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 160 0 0 0 10 33 7 28 55 12 98 -1 0 18 30 0 2 36 0 44 36 - 0 23 29 161 0 0 0 1 37 7 28 53 13 98 -1 0 9 35 - 0 6 20 0 35 40 - 0 32 25 162 0 0 - 0 7 19 7 28 51 14 98 -2 0 0 38 - 0 15 16 0 26 44 - 0 41 22 163 0 0 - 0 16 15 7 28 48 15 98 -3 - 0 8 18 - 0 24 13 0 17 47 - 0 50 18 164 0 0 - 0 25 12 7 28 46 16 98 -4 - 0 17 15 - 0 33 9 0 8 51 - 0 59 15 165 0 0 - 0 34 8 7 28 43 17 98 -5 - 0 26 11 - 0 42 6 - 0 0 6 - 1 8 11 166 0 0 - 0 43 4 7 28 40 18 98 -6 - 0 35 7 - 0 51 2 - 0 9 2 - 1 17 7 167 0 0 - 0 52 0 7 28 37 19 98 -7 - 0 44 3 - 0 59 57 - 0 17 58 - 1 26 3 168 0 0 - 1 0 55 7 28 34 20 98 -8 - 0 52 58 - 1 8 52 - 0 26 53 - 1 34 58 169 0 0 - 1 9 50 7 28 30 21 98 -9 - 1 1 52 - 1 17 47 - 0 35 47 - 1 43 52 170 0 0 - 1 18 43 7 28 26 22 98 -10 - 1 10 46 - 1 26 40 - 0 44 41 - 1 52 45 171 0 0 - 1 27 35 7 28 23 23 98 -11 - 1 19 38 - 1 35 32 - 0 53 33 - 2 1 38 172 0 0 - 1 36 26 7 28 19 24 98 -12 - 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3 55 32 Uncertainty in time = +/- 5 secs Prediction of 2012 Jun 21.0 Data for the target star ------------------------ * name: TYC 5722-01583-1 * constellation : Aquila * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 28 17.9780 DE: -08 08 17.951 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .030 ) * V mag [mag]: 10.3 * B mag [mag]: 10.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (899) Jokaste approx. diameter [km]: 29 approx. diameter ["]: .023 distance from Earth [AU]: 1.74500 * orbital information: orbit source: Preston date of fit: 2012 Jun 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 853 number of rejected observations: 48 time covered by the observations: 1918 Aug 03 - 2012 Jun 10 1 sigma uncertainty ellipse (major, minor, PA): 0.035, 0.022, 70° remarks: * orbital elements for (899) Jokaste : Mean anomaly = 298.39989364 deg Arg. of pericenter = 127.51634907 deg Long. of node = 252.63357588 deg Inclination = 12.47569602 deg Eccentricity = 0.19719224 Semimajor axis = 2.90888351 AU Perihelion dist = 2.33527424 AU Mag: H = 10.01, G = 0.15 Epoch of elements : MJD 56132.30600000 TDT (2012 Jul 24.306) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Jul 24 899 Jokaste 7h 19.8m UT 10.3 19 28 17.978- 8 8 17.95TYC 5722-01583-1 10.6 14.0 29 2.5 1.745 -2.187 1.48 -120.3066 -8.139 71.68 19.75 7.3306 -0.00038 -0.01136 -6.44751 0.29523 0.00110 -0.00113 2000 297.9417802012 722.00000127.516349252.633576 12.4756960.19719224 2.9088835 2.335274310.1 5.00.15 RATE 1.9866190 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.042 0.037 76 2.64 0.037 0 0 0-1 056099.0020120724_1583-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jun 21, 00:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org