IOTA/IOTA-ES occultation update for (78) Diana / 2UCAC 16889232 event on 2008 May 03, 11:21 UT Visible from S Pacific Islands Summary ------- On 2008 May 03 UT, the 121 km diameter asteroid (78) Diana will occult a 11.9 mag star in the constellation Scorpius for observers along a path across S Pacific Islands. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.4 mag to 12.9 mag (the magnitude of the asteroid) for at most 18.8 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: 98 * date and approx. time of event: 2008 May 03, 11:08 - 2008 May 03, 11:36 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 1.4 * estimated maximum duration [s]: 18.8 * Moon: 6 % sunlit, 107° distance * Sun: 134° distance * rough path description: S Pacific Islands The occultation path -------------------- * approximate projected width [km]: 135 * 1 sigma uncertainty interval [path widths]: +/- 0.36 * 1 sigma uncertainty interval [seconds]: +/- 6.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .028", 88° ) * approx speed of asteroid's shadow [km/s]: 6.4096 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 16889232 by 78 Diana on 2008 May 3 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 142 0 0 0 32 5 11 36 40 0 125 -44 .. .. .. - 0 13 31 .. .. .. - 0 46 6 143 0 0 - 0 10 1 11 36 39 1 125 -46 0 35 36 - 0 55 14 1 8 42 - 1 27 33 144 0 0 - 0 51 5 11 36 39 3 125 -47 - 0 5 51 - 1 35 55 0 26 58 - 2 7 59 145 0 0 - 1 31 6 11 36 37 4 125 -48 - 0 46 15 - 2 15 35 - 0 13 42 - 2 47 24 146 0 0 - 2 10 7 11 36 35 5 125 -49 - 1 25 37 - 2 54 15 - 0 53 20 - 3 25 48 147 0 0 - 2 48 6 11 36 33 6 125 -50 - 2 3 57 - 3 31 53 - 1 31 56 - 4 3 12 148 0 0 - 3 25 5 11 36 31 7 125 -51 - 2 41 16 - 4 8 32 - 2 9 30 - 4 39 37 149 0 0 - 4 1 4 11 36 27 8 125 -53 - 3 17 35 - 4 44 12 - 2 46 4 - 5 15 3 150 0 0 - 4 36 3 11 36 24 10 125 -54 - 3 52 54 - 5 18 52 - 3 21 37 - 5 49 30 151 0 0 - 5 10 3 11 36 20 11 125 -55 - 4 27 13 - 5 52 34 - 3 56 10 - 6 22 59 152 0 0 - 5 43 5 11 36 16 12 125 -56 - 5 0 33 - 6 25 18 - 4 29 43 - 6 55 30 153 0 0 - 6 15 9 11 36 11 13 125 -57 - 5 32 55 - 6 57 5 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0 -15 12 40 11 32 20 39 124 -84 -14 35 18 -15 49 48 -14 8 17 -16 16 25 -179 0 0 -15 21 34 11 32 9 40 124 -85 -14 44 18 -15 58 38 -14 17 20 -16 25 12 -178 0 0 -15 29 46 11 31 57 41 124 -86 -14 52 34 -16 6 45 -14 25 39 -16 33 16 -177 0 0 -15 37 14 11 31 45 42 124 -87 -15 0 7 -16 14 10 -14 33 15 -16 40 37 -176 0 0 -15 44 0 11 31 33 42 124 -87 -15 6 57 -16 20 52 -14 40 8 -16 47 17 -175 0 0 -15 50 4 11 31 21 43 124 -88 -15 13 4 -16 26 52 -14 46 17 -16 53 15 -174 0 0 -15 55 25 11 31 9 44 124 -89 -15 18 28 -16 32 10 -14 51 44 -16 58 31 -173 0 0 -16 0 5 11 30 57 45 124 -89 -15 23 10 -16 36 47 -14 56 28 -17 3 5 -172 0 0 -16 4 2 11 30 44 46 125 -88 -15 27 10 -16 40 42 -15 0 30 -17 6 59 -171 0 0 -16 7 18 11 30 31 46 125 -87 -15 30 28 -16 43 56 -15 3 49 -17 10 11 -170 0 0 -16 9 52 11 30 18 47 125 -87 -15 33 4 -16 46 29 -15 6 26 -17 12 43 -169 0 0 -16 11 45 11 30 5 48 125 -86 -15 34 58 -16 48 20 -15 8 22 -17 14 34 -168 0 0 -16 12 57 11 29 52 49 126 -85 -15 36 11 -16 49 31 -15 9 35 -17 15 44 -167 0 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31 -100 0 0 10 48 14 11 11 23 39 204 -17 11 37 21 9 59 36 12 13 2 9 24 53 - 99 0 0 11 38 55 11 11 8 38 204 -16 12 28 25 10 49 55 13 4 23 10 14 57 - 98 0 0 12 30 18 11 10 53 37 205 -15 13 20 11 11 40 56 13 56 26 11 5 42 - 97 0 0 13 22 22 11 10 38 36 205 -14 14 12 37 12 32 38 14 49 9 11 57 8 - 96 0 0 14 15 4 11 10 24 35 206 -12 15 5 43 13 24 58 15 42 32 12 49 12 - 95 0 0 15 8 24 11 10 10 34 206 -11 15 59 26 14 17 56 16 36 32 13 41 55 - 94 0 0 16 2 20 11 9 57 32 207 -10 16 53 45 15 11 29 17 31 8 14 35 13 - 93 0 0 16 56 50 11 9 44 31 207 -9 17 48 38 16 5 37 18 26 19 15 29 5 - 92 0 0 17 51 53 11 9 31 30 208 -8 18 44 4 17 0 17 19 22 1 16 23 30 - 91 0 0 18 47 25 11 9 19 29 208 -7 19 39 59 17 55 28 20 18 13 17 18 25 - 90 0 0 19 43 26 11 9 7 27 209 -5 20 36 22 18 51 7 21 14 53 18 13 49 - 89 0 0 20 39 53 11 8 56 26 209 -4 21 33 11 19 47 12 22 11 59 19 9 39 - 88 0 0 21 36 43 11 8 45 25 210 -3 22 30 23 20 43 41 23 9 27 20 5 53 - 87 0 0 22 33 53 11 8 35 24 210 -2 23 27 55 21 40 31 24 7 15 21 2 28 - 86 0 0 23 31 22 11 8 25 22 211 -1 24 25 44 22 37 39 25 5 20 21 59 23 Uncertainty in time = +/- 8 secs [Prediction of 2008 Apr 23.0] Data for the target star ------------------------ * name: 2UCAC 16889232 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 48 28.9580 DE: -35 18 40.625 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .023 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (78) Diana approx. diameter [km]: 121 approx. diameter ["]: .080 distance from Earth [AU]: 2.07800 * orbital information: orbit source: Preston date of fit: 2008 Apr 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 827 number of rejected observations: 95 time covered by the observations: 1901 Feb 14 - 2008 Apr 04 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.016, 83° remarks: * orbital elements for (78) Diana : Mean anomaly = 107.44835298 deg Arg. of pericenter = 151.58303617 deg Long. of node = 333.56036909 deg Inclination = 8.68776462 deg Eccentricity = 0.20702588 Semimajor axis = 2.62081437 AU Perihelion dist = 2.07823797 AU Mag: H = 8.20, G = 0.08 Epoch of elements : MJD 54589.47300000 TDT (2008 May 03.473) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 3 78 Diana 11h 21.8m UT 11.9 17 48 28.958-35 18 40.622UCAC 16889232 0.0 12.9 121 18.8 2.078 -1.128 -6.66 -125.0674 -35.309 8.76 15.86 11.3637 -0.19401 0.40333 -3.25727 -1.57423 -0.00398 0.00092 2000 105.2477732008 424.00000151.583036333.560369 8.6877650.20702588 2.6208144 2.0782380 8.1 5.00.08 RATE 2.3230020 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.028 88 1.36 0.029 0 54579.5020080503_889232 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 23, 03:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org