IOTA/IOTA-ES occultation update for (2137) Priscilla / TYC 7424-01490-1 event on 2009 Jul 01, 01:34 UT Visible from Africa, Brazil Summary ------- On 2009 Jul 01 UT, the 41 km diameter asteroid (2137) Priscilla will occult a 10.9 mag star in the constellation Sagittarius for observers along a path across Africa, Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.1 mag to 16.0 mag (the magnitude of the asteroid) for at most 3.0 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: 31 * date and approx. time of event: 2009 Jul 01, 01:26 - 2009 Jul 01, 01:41 UT * magnitude of target star: 10.9 * magnitude drop [mag]: 5.1 * estimated maximum duration [s]: 3.0 * Moon: 66 % sunlit, 79° distance * Sun: 167° distance * rough path description: Africa, Brazil The occultation path -------------------- * approximate projected width [km]: 42 * 1 sigma uncertainty interval [path widths]: +/- 2.17 * 1 sigma uncertainty interval [seconds]: +/- 6.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .063 +/- .052) * 1 sigma uncertainty ellipse (major, minor, PA): ( .063", .051", 74° ) * approx speed of asteroid's shadow [km/s]: 13.5445 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7424-01490-1 by 2137 Priscilla on 2009 Jul 1 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 - 94 0 0 12 2 27 1 41 54 1 123 -14 12 16 9 11 48 47 13 15 47 .. .. .. - 93 0 0 11 25 15 1 41 54 2 123 -15 11 38 56 11 11 36 12 38 29 .. .. .. - 92 0 0 10 48 10 1 41 53 3 123 -16 11 1 49 10 34 32 12 1 17 9 35 35 - 91 0 0 10 11 13 1 41 53 5 123 -17 10 24 51 9 57 37 11 24 13 8 58 45 - 90 0 0 9 34 25 1 41 52 6 123 -18 9 48 2 9 20 50 10 47 17 8 22 4 - 89 0 0 8 57 48 1 41 51 7 123 -19 9 11 23 8 44 14 10 10 32 7 45 35 - 88 0 0 8 21 22 1 41 49 8 124 -20 8 34 55 8 7 50 9 33 57 7 9 18 - 87 0 0 7 45 9 1 41 48 9 124 -22 7 58 40 7 31 38 8 57 35 6 33 13 - 86 0 0 7 9 9 1 41 46 10 124 -23 7 22 39 6 55 40 8 21 26 5 57 23 - 85 0 0 6 33 24 1 41 44 11 124 -24 6 46 52 6 19 57 7 45 31 5 21 47 - 84 0 0 5 57 55 1 41 42 13 124 -25 6 11 21 5 44 30 7 9 52 4 46 28 - 83 0 0 5 22 43 1 41 40 14 124 -26 5 36 7 5 9 20 6 34 29 4 11 26 - 82 0 0 4 47 48 1 41 38 15 124 -27 5 1 10 4 34 27 5 59 24 3 36 42 - 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5 19 39 - 5 44 51 - 4 24 46 - 6 39 20 40 0 0 - 5 5 47 1 28 23 37 234 -28 - 4 53 8 - 5 18 25 - 3 58 6 - 6 13 4 41 0 0 - 4 38 49 1 28 17 36 234 -27 - 4 26 8 - 4 51 29 - 3 30 55 - 5 46 18 42 0 0 - 4 11 21 1 28 12 35 234 -26 - 3 58 38 - 4 24 4 - 3 3 15 - 5 19 3 43 0 0 - 3 43 25 1 28 7 34 234 -25 - 3 30 39 - 3 56 9 - 2 35 6 - 4 51 19 44 0 0 - 3 15 0 1 28 2 33 234 -24 - 3 2 12 - 3 27 47 - 2 6 28 - 4 23 6 45 0 0 - 2 46 6 1 27 57 32 234 -23 - 2 33 16 - 2 58 55 - 1 37 22 - 3 54 25 46 0 0 - 2 16 45 1 27 52 30 234 -22 - 2 3 52 - 2 29 36 - 1 7 48 - 3 25 16 47 0 0 - 1 46 56 1 27 48 29 234 -21 - 1 34 1 - 1 59 50 - 0 37 46 - 2 55 39 48 0 0 - 1 16 40 1 27 43 28 234 -20 - 1 3 43 - 1 29 36 - 0 7 18 - 2 25 36 49 0 0 - 0 45 58 1 27 39 27 235 -19 - 0 32 58 - 0 58 56 0 23 37 - 1 55 6 50 0 0 - 0 14 49 1 27 34 26 235 -18 - 0 1 47 - 0 27 50 0 54 58 - 1 24 10 51 0 0 0 16 44 1 27 30 25 235 -16 0 29 49 0 3 41 1 26 44 - 0 52 48 52 0 0 0 48 43 1 27 26 24 235 -15 1 1 49 0 35 37 1 58 55 - 0 21 2 53 0 0 1 21 5 1 27 23 23 235 -14 1 34 14 1 7 57 2 31 29 0 11 9 54 0 0 1 53 51 1 27 19 22 235 -13 2 7 2 1 40 41 3 4 27 0 43 43 55 0 0 2 27 0 1 27 16 21 235 -12 2 40 13 2 13 48 3 37 48 1 16 40 56 0 0 3 0 31 1 27 12 19 235 -11 3 13 46 2 47 16 4 11 30 1 49 59 57 0 0 3 34 23 1 27 9 18 235 -10 3 47 40 3 21 6 4 45 34 2 23 40 58 0 0 4 8 35 1 27 6 17 235 -9 4 21 55 3 55 17 5 19 58 2 57 42 59 0 0 4 43 7 1 27 3 16 235 -7 4 56 29 4 29 47 5 54 41 3 32 3 60 0 0 5 17 58 1 27 1 15 235 -6 5 31 22 5 4 35 6 29 42 4 6 43 61 0 0 5 53 7 1 26 59 14 236 -5 6 6 32 5 39 42 7 5 1 4 41 42 62 0 0 6 28 32 1 26 56 13 236 -4 6 42 0 6 15 6 7 40 37 5 16 57 63 0 0 7 4 13 1 26 54 11 236 -3 7 17 43 6 50 45 8 16 28 5 52 29 64 0 0 7 40 10 1 26 52 10 236 -2 7 53 41 7 26 40 8 52 33 6 28 16 65 0 0 8 16 20 1 26 51 9 236 -1 8 29 52 8 2 48 9 28 52 7 4 17 Uncertainty in time = +/- 8 secs Prediction of 2009 Jun 30.0 Data for the target star ------------------------ * name: TYC 7424-01490-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 27 16.5003 DE: -31 29 56.255 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .025 ) * V mag [mag]: 10.9 * B mag [mag]: 11.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2137) Priscilla approx. diameter [km]: 41 approx. diameter ["]: .024 distance from Earth [AU]: 2.37600 * orbital information: orbit source: Preston date of fit: 2009 Jun 30 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 737 number of rejected observations: 23 time covered by the observations: 1936 Aug 24 - 2009 Jun 24 1 sigma uncertainty ellipse (major, minor, PA): 0.059, 0.045, 71° remarks: * orbital elements for (2137) Priscilla : Mean anomaly = 191.24702322 deg Arg. of pericenter = 135.21418943 deg Long. of node = 320.09581685 deg Inclination = 11.71559897 deg Eccentricity = 0.05995135 Semimajor axis = 3.18521029 AU Perihelion dist = 2.99425261 AU Mag: H = 11.01, G = 0.15 Epoch of elements : MJD 55013.06500000 TDT (2009 Jul 01.065) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 1 2137 Priscilla 1h 34.3m UT 10.9 19 27 16.500-31 29 56.26TYC 7424-01490-1 11.6 16.0 41 3.0 2.376 -2.213 -0.15 -11.0091 -31.499 157.38 23.11 1.5721 -0.00180 0.25951 -7.64481 -0.04061 -0.00103 0.00078 2000 190.7156162009 628.00000135.214189320.095817 11.7155990.05995135 3.1852103 2.994252611.1 5.00.15 RATE 1.7337920 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.063 0.051 74 3.17 0.052 0 55012.0020090701_1490-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Jun 30, 15:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org