IOTA/IOTA-ES occultation update for (1168) Brandia / HIP 18805 event on 2012 Dec 11, 09:19 UT Visible from E Australia in twilight Summary ------- On 2012 Dec 11 UT, the 11 km diameter asteroid (1168) Brandia will occult a 5.7 mag star in the constellation Taurus for observers along a path across E Australia in twilight. In the case of an occultation, the combined light of the asteroid and the star will drop by 10.2 mag to 15.9 mag (the magnitude of the asteroid) for at most 1.1 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: . The event at a glimpse ---------------------- * Rank: 15 * date and approx. time of event: 2012 Dec 11, 09:09 - 2012 Dec 11, 09:29 UT * geocentric midpoint of event [JD]: 2456272.88875417 * magnitude of target star: 5.7 * magnitude drop [mag]: 10.2 * estimated maximum duration [s]: 1.1 * Moon: 5 % sunlit, 167° distance * Sun: 158° distance * rough path description: E Australia in twilight Additional comments ------------------- close double star The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 4.44 * 1 sigma uncertainty interval [seconds]: +/- 7.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .074 +/- .038) * 1 sigma uncertainty ellipse (major, minor, PA): ( .074", .038", 87° ) * approx speed of asteroid's shadow [km/s]: 9.4532 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 18805 by 1168 Brandia on 2012 Dec 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 143 0 0 -34 29 35 9 29 39 22 60 0 -34 26 11 -34 32 59 -33 56 4 -35 3 13 144 0 0 -34 9 7 9 29 34 23 59 -1 -34 5 43 -34 12 31 -33 35 33 -34 42 49 145 0 0 -33 48 20 9 29 30 24 59 -2 -33 44 55 -33 51 44 -33 14 41 -34 22 5 146 0 0 -33 27 12 9 29 26 24 58 -3 -33 23 47 -33 30 37 -32 53 31 -34 1 1 147 0 0 -33 5 45 9 29 21 25 58 -4 -33 2 20 -33 9 11 -32 32 0 -33 39 38 148 0 0 -32 43 59 9 29 16 26 57 -5 -32 40 34 -32 47 25 -32 10 11 -33 17 55 149 0 0 -32 21 54 9 29 11 27 56 -5 -32 18 28 -32 25 20 -31 48 2 -32 55 54 150 0 0 -31 59 31 9 29 6 28 56 -6 -31 56 4 -32 2 57 -31 25 35 -32 33 33 151 0 0 -31 36 49 9 29 1 29 55 -7 -31 33 22 -31 40 15 -31 2 50 -32 10 54 152 0 0 -31 13 49 9 28 55 30 55 -8 -31 10 22 -31 17 16 -30 39 47 -31 47 58 153 0 0 -30 50 31 9 28 49 31 54 -9 -30 47 4 -30 53 58 -30 16 26 -31 24 43 154 0 0 -30 26 56 9 28 43 32 53 -10 -30 23 28 -30 30 24 -29 52 49 -31 1 11 155 0 0 -30 3 4 9 28 37 33 53 -11 -29 59 36 -30 6 32 -29 28 54 -30 37 22 156 0 0 -29 38 56 9 28 31 33 52 -12 -29 35 27 -29 42 24 -29 4 43 -30 13 16 157 0 0 -29 14 31 9 28 24 34 52 -13 -29 11 3 -29 17 59 -28 40 15 -29 48 54 158 0 0 -28 49 51 9 28 18 35 51 -14 -28 46 22 -28 53 19 -28 15 33 -29 24 16 159 0 0 -28 24 55 9 28 11 36 50 -15 -28 21 26 -28 28 24 -27 50 35 -28 59 23 160 0 0 -27 59 44 9 28 4 37 50 -16 -27 56 15 -28 3 14 -27 25 22 -28 34 15 161 0 0 -27 34 20 9 27 57 38 49 -16 -27 30 50 -27 37 49 -26 59 55 -28 8 52 162 0 0 -27 8 41 9 27 49 39 48 -17 -27 5 12 -27 12 11 -26 34 15 -27 43 15 163 0 0 -26 42 49 9 27 42 40 48 -18 -26 39 19 -26 46 19 -26 8 21 -27 17 25 164 0 0 -26 16 44 9 27 34 41 47 -19 -26 13 15 -26 20 14 -25 42 15 -26 51 22 165 0 0 -25 50 27 9 27 26 42 46 -20 -25 46 57 -25 53 57 -25 15 56 -26 25 6 166 0 0 -25 23 58 9 27 18 43 46 -21 -25 20 28 -25 27 29 -24 49 26 -25 58 39 167 0 0 -24 57 18 9 27 10 44 45 -22 -24 53 48 -25 0 49 -24 22 45 -25 32 0 168 0 0 -24 30 28 9 27 1 45 44 -23 -24 26 58 -24 33 58 -23 55 53 -25 5 11 169 0 0 -24 3 27 9 26 52 45 44 -24 -23 59 57 -24 6 58 -23 28 51 -24 38 11 170 0 0 -23 36 17 9 26 44 46 43 -25 -23 32 47 -23 39 48 -23 1 41 -24 11 2 171 0 0 -23 8 59 9 26 35 47 42 -26 -23 5 28 -23 12 29 -22 34 21 -23 43 44 172 0 0 -22 41 32 9 26 26 48 41 -27 -22 38 1 -22 45 2 -22 6 54 -23 16 17 173 0 0 -22 13 57 9 26 16 49 41 -28 -22 10 26 -22 17 28 -21 39 19 -22 48 43 174 0 0 -21 46 16 9 26 7 50 40 -29 -21 42 45 -21 49 47 -21 11 37 -22 21 2 175 0 0 -21 18 28 9 25 57 51 39 -30 -21 14 57 -21 21 59 -20 43 50 -21 53 14 176 0 0 -20 50 35 9 25 47 52 38 -31 -20 47 4 -20 54 6 -20 15 57 -21 25 21 177 0 0 -20 22 37 9 25 38 53 37 -32 -20 19 6 -20 26 8 -19 47 59 -20 57 23 178 0 0 -19 54 34 9 25 27 54 36 -33 -19 51 4 -19 58 5 -19 19 57 -20 29 20 179 0 0 -19 26 28 9 25 17 55 35 -34 -19 22 58 -19 29 59 -18 51 51 -20 1 13 180 0 0 -18 58 20 9 25 7 56 34 -35 -18 54 49 -19 1 50 -18 23 43 -19 33 4 -179 0 0 -18 30 9 9 24 56 57 33 -36 -18 26 38 -18 33 39 -17 55 33 -19 4 52 -178 0 0 -18 1 56 9 24 46 57 32 -37 -17 58 26 -18 5 26 -17 27 21 -18 36 38 -177 0 0 -17 33 42 9 24 35 58 31 -37 -17 30 12 -17 37 13 -16 59 9 -18 8 24 -176 0 0 -17 5 29 9 24 24 59 30 -38 -17 1 59 -17 8 59 -16 30 57 -17 40 9 -175 0 0 -16 37 16 9 24 13 60 29 -39 -16 33 46 -16 40 46 -16 2 45 -17 11 54 -174 0 0 -16 9 4 9 24 2 61 27 -40 -16 5 34 -16 12 34 -15 34 35 -16 43 41 -173 0 0 -15 40 54 9 23 51 62 26 -41 -15 37 24 -15 44 24 -15 6 26 -16 15 29 -172 0 0 -15 12 47 9 23 40 62 25 -42 -15 9 17 -15 16 16 -14 38 21 -15 47 20 -171 0 0 -14 44 43 9 23 28 63 23 -43 -14 41 13 -14 48 12 -14 10 18 -15 19 14 -170 0 0 -14 16 42 9 23 17 64 21 -44 -14 13 13 -14 20 11 -13 42 20 -14 51 12 -169 0 0 -13 48 47 9 23 5 65 20 -45 -13 45 18 -13 52 16 -13 14 27 -14 23 14 -168 0 0 -13 20 57 9 22 54 66 18 -46 -13 17 28 -13 24 25 -12 46 39 -13 55 22 -167 0 0 -12 53 12 9 22 42 66 16 -47 -12 49 44 -12 56 41 -12 18 57 -13 27 35 -166 0 0 -12 25 34 9 22 30 67 14 -48 -12 22 6 -12 29 3 -11 51 21 -12 59 55 -165 0 0 -11 58 4 9 22 19 68 12 -49 -11 54 36 -12 1 32 -11 23 53 -12 32 22 -164 0 0 -11 30 41 9 22 7 68 10 -49 -11 27 14 -11 34 9 -10 56 33 -12 4 57 -163 0 0 -11 3 27 9 21 55 69 7 -50 -11 0 0 -11 6 55 -10 29 22 -11 37 40 -162 0 0 -10 36 22 9 21 43 69 5 -51 -10 32 55 -10 39 49 -10 2 20 -11 10 32 -161 0 0 -10 9 27 9 21 31 70 2 -52 -10 6 0 -10 12 54 - 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67 0 0 6 3 38 9 9 7 1 280 -19 6 6 50 6 0 27 .. .. .. 5 32 4 Uncertainty in time = +/- 8 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: HIP 18805 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 01 46.1407 DE: +09 59 52.833 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .019, .017 ) * V mag [mag]: 5.7 * B mag [mag]: 5.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1168) Brandia approx. diameter [km]: 11 approx. diameter ["]: .010 distance from Earth [AU]: 1.46200 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 674 number of rejected observations: 16 time covered by the observations: 1930 Aug 27 - 2012 Nov 24 1 sigma uncertainty ellipse (major, minor, PA): 0.072, 0.034, 87° remarks: * orbital elements for (1168) Brandia : Mean anomaly = 62.44168828 deg Arg. of pericenter = 123.17907298 deg Long. of node = 218.74541214 deg Inclination = 12.73737315 deg Eccentricity = 0.21703118 Semimajor axis = 2.55374924 AU Perihelion dist = 1.99950604 AU Mag: H = 12.27, G = 0.15 Epoch of elements : MJD 56272.38800000 TDT (2012 Dec 11.388) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 11 1168 Brandia 9h 19.8m UT 5.7 4 1 46.141 9 59 52.83HIP 18805 5.7 15.9 11 1.1 1.462 -1.984 -13.02 -160.0041 10.001 38.40 -23.04 9.3301 0.12577 -0.28236 -4.87587 -2.16680 0.00166 0.00136 2000 61.864960201212 9.00000123.179073218.745412 12.7373730.21703118 2.5537492 1.999506012.5 5.00.15 RATE 2.4151090 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.074 0.038 87 5.44 0.046 0 0-3 3 056264.0020121211__18805 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 23:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org