IOTA/IOTA-ES occultation update for (921) Jovita / UCAC2 31534652 event on 2009 Jun 11, 06:25 UT Visible from Summary ------- On 2009 Jun 11 UT, the 59 km diameter asteroid (921) Jovita will occult a 11.9 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 2.6 mag to 14.4 mag (the magnitude of the asteroid) for at most 5.7 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: 50 * date and approx. time of event: 2009 Jun 11, 06:17 - 2009 Jun 11, 06:34 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 2.6 * estimated maximum duration [s]: 5.7 * Moon: 89 % sunlit, 39° distance * Sun: 157° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 71 * 1 sigma uncertainty interval [path widths]: +/- 1.27 * 1 sigma uncertainty interval [seconds]: +/- 8.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .072 +/- .060) * 1 sigma uncertainty ellipse (major, minor, PA): ( .072", .060", 88° ) * approx speed of asteroid's shadow [km/s]: 10.1805 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 31534652 by 921 Jovita on 2009 Jun 11 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 -151 0 0 55 6 22 6 34 7 16 117 0 55 26 19 54 46 29 56 17 21 53 56 21 -150 0 0 54 56 51 6 34 4 17 117 -1 55 16 51 54 36 57 56 8 0 53 46 43 -149 0 0 54 47 3 6 34 2 18 118 -1 55 7 5 54 27 6 55 58 21 53 36 46 -148 0 0 54 36 57 6 34 0 18 119 -2 54 57 1 54 16 57 55 48 24 53 26 30 -147 0 0 54 26 32 6 33 57 19 120 -2 54 46 39 54 6 29 55 38 8 53 15 56 -146 0 0 54 15 49 6 33 54 19 121 -3 54 35 59 53 55 44 55 27 35 53 5 4 -145 0 0 54 4 47 6 33 52 20 122 -3 54 25 0 53 44 39 55 16 43 52 53 53 -144 0 0 53 53 27 6 33 49 21 123 -4 54 13 42 53 33 16 55 5 32 52 42 24 -143 0 0 53 41 48 6 33 46 21 123 -4 54 2 6 53 21 35 54 54 3 52 30 35 -142 0 0 53 29 50 6 33 43 22 124 -5 53 50 11 53 9 35 54 42 16 52 18 28 -141 0 0 53 17 34 6 33 40 22 125 -5 53 37 58 52 57 16 54 30 10 52 6 2 -140 0 0 53 4 59 6 33 37 23 126 -6 53 25 26 52 44 38 54 17 45 51 53 18 -139 0 0 52 52 5 6 33 34 24 127 -6 53 12 34 52 31 41 54 5 1 51 40 14 -138 0 0 52 38 52 6 33 30 24 128 -7 52 59 24 52 18 25 53 51 58 51 26 51 -137 0 0 52 25 20 6 33 27 25 129 -7 52 45 55 52 4 50 53 38 36 51 13 9 -136 0 0 52 11 29 6 33 23 25 129 -8 52 32 7 51 50 57 53 24 56 50 59 9 -135 0 0 51 57 19 6 33 19 26 130 -9 52 18 0 51 36 44 53 10 56 50 44 49 -134 0 0 51 42 50 6 33 16 27 131 -9 52 3 33 51 22 12 52 56 37 50 30 10 -133 0 0 51 28 2 6 33 12 27 132 -10 51 48 48 51 7 21 52 41 59 50 15 12 -132 0 0 51 12 54 6 33 8 28 133 -10 51 33 43 50 52 10 52 27 1 49 59 55 -131 0 0 50 57 28 6 33 4 28 134 -11 51 18 20 50 36 41 52 11 45 49 44 19 -130 0 0 50 41 42 6 32 59 29 135 -11 51 2 37 50 20 52 51 56 9 49 28 23 -129 0 0 50 25 37 6 32 55 30 136 -12 50 46 34 50 4 45 51 40 14 49 12 9 -128 0 0 50 9 13 6 32 50 30 137 -12 50 30 13 49 48 18 51 24 0 48 55 35 -127 0 0 49 52 30 6 32 46 31 137 -13 50 13 33 49 31 32 51 7 27 48 38 43 -126 0 0 49 35 28 6 32 41 32 138 -13 49 56 33 49 14 28 50 50 35 48 21 32 -125 0 0 49 18 7 6 32 36 32 139 -14 49 39 15 48 57 4 50 33 23 48 4 1 -124 0 0 49 0 27 6 32 31 33 140 -14 49 21 38 48 39 21 50 15 52 47 46 13 -123 0 0 48 42 28 6 32 26 34 141 -15 49 3 41 48 21 20 49 58 3 47 28 5 -122 0 0 48 24 10 6 32 21 34 142 -16 48 45 26 48 3 0 49 39 54 47 9 39 -121 0 0 48 5 34 6 32 15 35 143 -16 48 26 52 47 44 21 49 21 27 46 50 54 -120 0 0 47 46 39 6 32 10 35 144 -17 48 8 0 47 25 24 49 2 41 46 31 51 -119 0 0 47 27 26 6 32 4 36 145 -17 47 48 49 47 6 9 48 43 36 46 12 30 -118 0 0 47 7 55 6 31 59 37 146 -18 47 29 20 46 46 35 48 24 13 45 52 51 -117 0 0 46 48 6 6 31 53 37 147 -18 47 9 33 46 26 44 48 4 32 45 32 54 -116 0 0 46 27 58 6 31 47 38 148 -19 46 49 28 46 6 35 47 44 32 45 12 40 -115 0 0 46 7 34 6 31 40 39 149 -19 46 29 5 45 46 8 47 24 15 44 52 8 -114 0 0 45 46 51 6 31 34 39 150 -20 46 8 25 45 25 24 47 3 40 44 31 19 -113 0 0 45 25 52 6 31 28 40 151 -20 45 47 28 45 4 22 46 42 47 44 10 13 -112 0 0 45 4 35 6 31 21 41 152 -21 45 26 13 44 43 4 46 21 38 43 48 50 -111 0 0 44 43 2 6 31 15 41 153 -21 45 4 42 44 21 29 46 0 11 43 27 11 -110 0 0 44 21 13 6 31 8 42 154 -22 44 42 54 43 59 38 45 38 27 43 5 16 -109 0 0 43 59 7 6 31 1 42 155 -22 44 20 50 43 37 31 45 16 27 42 43 5 -108 0 0 43 36 46 6 30 54 43 157 -23 43 58 30 43 15 8 44 54 11 42 20 39 -107 0 0 43 14 9 6 30 46 44 158 -23 43 35 55 42 52 30 44 31 39 41 57 58 -106 0 0 42 51 18 6 30 39 44 159 -24 43 13 4 42 29 37 44 8 52 41 35 2 -105 0 0 42 28 11 6 30 32 45 160 -24 42 49 59 42 6 30 43 45 50 41 11 52 -104 0 0 42 4 51 6 30 24 46 161 -25 42 26 39 41 43 8 43 22 33 40 48 27 -103 0 0 41 41 16 6 30 16 46 163 -25 42 3 6 41 19 33 42 59 2 40 24 49 -102 0 0 41 17 28 6 30 8 47 164 -26 41 39 18 40 55 44 42 35 17 40 0 59 -101 0 0 40 53 27 6 30 0 47 165 -26 41 15 18 40 31 42 42 11 18 39 36 55 -100 0 0 40 29 13 6 29 52 48 166 -27 40 51 5 40 7 28 41 47 7 39 12 40 - 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9 0 0 10 12 48 6 17 29 11 267 0 10 32 5 9 53 35 11 21 23 9 5 6 Uncertainty in time = +/- 9 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 31534652 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 44 36.3503 DE: -00 53 15.013 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .057, .057 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (921) Jovita approx. diameter [km]: 59 approx. diameter ["]: .049 distance from Earth [AU]: 1.66000 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 733 number of rejected observations: 31 time covered by the observations: 1919 Sep 05 - 2008 Feb 09 1 sigma uncertainty ellipse (major, minor, PA): 0.044, 0.020, 85° remarks: * orbital elements for (921) Jovita : Mean anomaly = 351.68988730 deg Arg. of pericenter = 71.68554518 deg Long. of node = 205.05374378 deg Inclination = 16.29387579 deg Eccentricity = 0.17717881 Semimajor axis = 3.17913664 AU Perihelion dist = 2.61586098 AU Mag: H = 9.94, G = 0.15 Epoch of elements : MJD 54993.26800000 TDT (2009 Jun 11.268) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 11 921 Jovita 6h 26.0m UT 11.9 17 44 36.350- 0 53 15.01UCAC2 31534652 0.0 14.4 59 5.7 1.660 -1.857 12.26 -90.0709 -0.890 83.42 23.10 6.4326 0.22297 0.50631 -5.25845 2.31672 -0.00060 -0.00207 2000 351.1216592009 6 8.00000 71.685545205.053744 16.2938760.17717881 3.1791366 2.615861010.6 5.00.15 RATE 1.7387630 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.072 0.060 88 2.27 0.062 0 54545.5020090611_534652 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 09:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org