IOTA/IOTA-ES occultation update for (2678) Aavasaksa / TYC 1918-01713-1 event on 2009 Jan 06, 16:10 UT Visible from Summary ------- On 2009 Jan 06 UT, the 11 km diameter asteroid (2678) Aavasaksa will occult a 8.8 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.6 mag to 14.4 mag (the magnitude of the asteroid) for at most 1.3 seconds. This update is based on historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 12 * date and approx. time of event: 2009 Jan 06, 16:01 - 2009 Jan 06, 16:20 UT * magnitude of target star: 8.8 * magnitude drop [mag]: 5.6 * estimated maximum duration [s]: 1.3 * Moon: 74 % sunlit, 64° distance * Sun: 174° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 5.66 * 1 sigma uncertainty interval [seconds]: +/- 8.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .109 +/- .079) * 1 sigma uncertainty ellipse (major, minor, PA): ( .109", .079", 97° ) * approx speed of asteroid's shadow [km/s]: 8.7119 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1918-01713-1 by 2678 Aavasaksa on 2009 Jan 6 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 43 0 0 -23 27 59 16 20 13 0 60 -5 -23 23 23 -23 32 35 .. .. .. .. .. .. 44 0 0 -22 56 19 16 20 13 1 60 -6 -22 51 45 -23 0 53 .. .. .. -23 53 8 45 0 0 -22 25 13 16 20 12 2 59 -7 -22 20 41 -22 29 46 .. .. .. -23 21 43 46 0 0 -21 54 43 16 20 12 3 59 -8 -21 50 12 -21 59 15 .. .. .. -22 50 54 47 0 0 -21 24 49 16 20 10 4 58 -9 -21 20 19 -21 29 19 .. .. .. -22 20 41 48 0 0 -20 55 31 16 20 9 5 58 -10 -20 51 3 -20 59 59 .. .. .. -21 51 5 49 0 0 -20 26 49 16 20 7 6 58 -12 -20 22 23 -20 31 17 -19 32 25 -21 22 5 50 0 0 -19 58 45 16 20 5 8 57 -13 -19 54 20 -20 3 11 -19 4 37 -20 53 43 51 0 0 -19 31 18 16 20 3 9 57 -14 -19 26 54 -19 35 43 -18 37 27 -20 25 59 52 0 0 -19 4 29 16 20 0 10 57 -15 -19 0 6 -19 8 52 -18 10 54 -19 58 53 53 0 0 -18 38 18 16 19 57 11 56 -16 -18 33 57 -18 42 40 -17 44 59 -19 32 26 54 0 0 -18 12 45 16 19 54 12 56 -17 -18 8 25 -18 17 6 -17 19 41 -19 6 37 55 0 0 -17 47 51 16 19 50 13 56 -18 -17 43 32 -17 52 10 -16 55 2 -18 41 27 56 0 0 -17 23 35 16 19 46 14 55 -19 -17 19 18 -17 27 53 -16 31 1 -18 16 55 57 0 0 -16 59 58 16 19 42 15 55 -20 -16 55 42 -17 4 15 -16 7 38 -17 53 4 58 0 0 -16 37 1 16 19 38 16 55 -21 -16 32 45 -16 41 16 -15 44 55 -17 29 51 59 0 0 -16 14 42 16 19 33 17 54 -22 -16 10 27 -16 18 56 -15 22 49 -17 7 18 60 0 0 -15 53 2 16 19 28 18 54 -23 -15 48 49 -15 57 16 -15 1 23 -16 45 25 61 0 0 -15 32 2 16 19 23 19 54 -24 -15 27 50 -15 36 14 -14 40 35 -16 24 11 62 0 0 -15 11 41 16 19 17 19 53 -25 -15 7 30 -15 15 52 -14 20 27 -16 3 37 63 0 0 -14 51 59 16 19 12 20 53 -26 -14 47 49 -14 56 9 -14 0 57 -15 43 43 64 0 0 -14 32 57 16 19 6 21 52 -27 -14 28 48 -14 37 6 -13 42 6 -15 24 29 65 0 0 -14 14 34 16 18 59 22 52 -27 -14 10 26 -14 18 42 -13 23 55 -15 5 54 66 0 0 -13 56 50 16 18 53 23 52 -28 -13 52 43 -14 0 58 -13 6 22 -14 47 59 67 0 0 -13 39 46 16 18 46 24 51 -29 -13 35 40 -13 43 53 -12 49 28 -14 30 44 68 0 0 -13 23 21 16 18 40 25 51 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8 48 1 -53 -14 20 9 -14 28 22 -13 33 57 -15 15 13 123 0 0 -14 42 29 16 8 56 48 360 -53 -14 38 22 -14 46 37 -13 52 2 -15 33 37 124 0 0 -15 1 20 16 8 44 48 358 -52 -14 57 12 -15 5 28 -14 10 42 -15 52 39 125 0 0 -15 20 47 16 8 32 47 357 -52 -15 16 38 -15 24 56 -14 29 58 -16 12 17 126 0 0 -15 40 50 16 8 20 47 356 -51 -15 36 40 -15 45 0 -14 49 50 -16 32 32 127 0 0 -16 1 29 16 8 8 47 355 -51 -15 57 19 -16 5 40 -15 10 18 -16 53 23 128 0 0 -16 22 45 16 7 56 46 354 -50 -16 18 33 -16 26 57 -15 31 22 -17 14 50 129 0 0 -16 44 35 16 7 44 46 352 -50 -16 40 23 -16 48 49 -15 53 0 -17 36 54 130 0 0 -17 7 2 16 7 32 45 351 -49 -17 2 48 -17 11 16 -16 15 14 -17 59 33 131 0 0 -17 30 4 16 7 21 45 350 -49 -17 25 49 -17 34 19 -16 38 4 -18 22 49 132 0 0 -17 53 41 16 7 9 44 349 -48 -17 49 25 -17 57 57 -17 1 28 -18 46 40 133 0 0 -18 17 53 16 6 58 43 348 -47 -18 13 36 -18 22 11 -17 25 26 -19 11 6 134 0 0 -18 42 40 16 6 46 43 347 -47 -18 38 22 -18 46 59 -17 50 0 -19 36 7 135 0 0 -19 8 2 16 6 35 42 346 -46 -19 3 42 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30 52 -26 24 37 149 0 0 -25 59 58 16 4 12 32 334 -34 -25 55 20 -26 4 37 -25 3 17 -26 57 38 150 0 0 -26 33 8 16 4 3 31 333 -33 -26 28 28 -26 37 48 -25 36 9 -27 31 6 151 0 0 -27 6 44 16 3 54 30 332 -32 -27 2 3 -27 11 26 -26 9 27 -28 5 1 152 0 0 -27 40 46 16 3 46 29 332 -32 -27 36 3 -27 45 29 -26 43 10 -28 39 22 153 0 0 -28 15 12 16 3 37 28 331 -31 -28 10 28 -28 19 57 -27 17 18 -29 14 8 154 0 0 -28 50 2 16 3 30 27 330 -30 -28 45 17 -28 54 48 -27 51 50 -29 49 17 155 0 0 -29 25 15 16 3 22 26 329 -29 -29 20 28 -29 30 3 -28 26 45 -30 24 50 156 0 0 -30 0 50 16 3 14 25 329 -28 -29 56 2 -30 5 40 -29 2 2 -31 0 44 157 0 0 -30 36 46 16 3 7 24 328 -27 -30 31 56 -30 41 37 -29 37 39 -31 36 59 158 0 0 -31 13 2 16 3 0 23 327 -26 -31 8 10 -31 17 54 -30 13 37 -32 13 34 159 0 0 -31 49 36 16 2 54 22 327 -25 -31 44 43 -31 54 30 -30 49 53 -32 50 27 160 0 0 -32 26 28 16 2 47 21 326 -24 -32 21 33 -32 31 23 -31 26 26 -33 27 38 161 0 0 -33 3 35 16 2 41 20 325 -23 -32 58 39 -33 8 32 -32 3 16 -34 5 5 162 0 0 -33 40 58 16 2 35 19 325 -22 -33 36 0 -33 45 56 -32 40 21 -34 42 46 163 0 0 -34 18 34 16 2 30 18 324 -21 -34 13 35 -34 23 34 -33 17 40 -35 20 41 164 0 0 -34 56 23 16 2 24 17 324 -20 -34 51 22 -35 1 24 -33 55 11 -35 58 47 165 0 0 -35 34 22 16 2 19 16 323 -19 -35 29 20 -35 39 25 -34 32 54 -36 37 5 166 0 0 -36 12 31 16 2 15 15 322 -18 -36 7 27 -36 17 35 -35 10 46 -37 15 31 167 0 0 -36 50 47 16 2 10 14 322 -17 -36 45 42 -36 55 53 -35 48 46 -37 54 5 168 0 0 -37 29 10 16 2 6 13 321 -16 -37 24 4 -37 34 17 -36 26 53 -38 32 44 169 0 0 -38 7 38 16 2 3 13 320 -15 -38 2 31 -38 12 46 -37 5 6 -39 11 28 170 0 0 -38 46 9 16 1 59 12 320 -14 -38 41 1 -38 51 18 -37 43 22 -39 50 15 171 0 0 -39 24 42 16 1 56 11 319 -13 -39 19 32 -39 29 52 -38 21 41 -40 29 3 172 0 0 -40 3 15 16 1 53 10 318 -12 -39 58 4 -40 8 26 -39 0 0 -41 7 50 173 0 0 -40 41 46 16 1 50 9 318 -11 -40 36 34 -40 46 59 -39 38 18 -41 46 36 174 0 0 -41 20 14 16 1 48 8 317 -10 -41 15 1 -41 25 28 -40 16 34 -42 25 17 175 0 0 -41 58 38 16 1 46 7 316 -9 -41 53 24 -42 3 52 -40 54 46 -43 3 52 176 0 0 -42 36 55 16 1 44 6 316 -8 -42 31 40 -42 42 10 -41 32 52 -43 42 21 177 0 0 -43 15 4 16 1 43 5 315 -7 -43 9 48 -43 20 20 .. .. .. -44 20 40 178 0 0 -43 53 3 16 1 42 4 314 -6 -43 47 46 -43 58 20 .. .. .. -44 58 49 179 0 0 -44 30 51 16 1 41 3 314 -5 -44 25 34 -44 36 9 .. .. .. -45 36 46 180 0 0 -45 8 26 16 1 40 2 313 -4 -45 3 8 -45 13 44 .. .. .. -46 14 28 -179 0 0 -45 45 46 16 1 40 1 312 -3 -45 40 28 -45 51 5 .. .. .. -46 51 56 Uncertainty in time = +/- 10 secs [Prediction of 2008 Nov 4.0] Data for the target star ------------------------ * name: TYC 1918-01713-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 24 41.8032 DE: +27 21 18.932 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .015, .018 ) * V mag [mag]: 8.8 * B mag [mag]: 8.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2678) Aavasaksa approx. diameter [km]: 11 approx. diameter ["]: .014 distance from Earth [AU]: 1.08400 * orbital information: orbit source: Preston date of fit: 2008 Apr 24 source of used astrometry: MPC (via Astdys) number of used observations: 718 number of rejected observations: 29 time covered by the observations: 1938 Feb 22 - 2007 Nov 14 1 sigma uncertainty ellipse (major, minor, PA): 0.108, 0.077, 97° remarks: * orbital elements for (2678) Aavasaksa : Mean anomaly = 6.13654599 deg Arg. of pericenter = 46.27935362 deg Long. of node = 54.07723902 deg Inclination = 3.44429846 deg Eccentricity = 0.08689599 Semimajor axis = 2.25983017 AU Perihelion dist = 2.06346000 AU Mag: H = 12.48, G = 0.15 Epoch of elements : MJD 54837.67400000 TDT (2009 Jan 06.674) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jan 6 2678 Aavasaksa 16h 10.9m UT 8.8 7 24 41.803 27 21 18.93TYC 1918-01713-1 8.9 14.4 11 1.3 1.084 -2.907 9.53 122.0690 27.351 -61.22 -22.42 16.1822 -0.15480 -0.62908 -4.77468 1.17546 -0.00028 -0.00048 2000 3.91010020081230.00000 46.279354 54.077239 3.4442980.08689599 2.2598302 2.063460012.4 5.00.15 RATE 2.9012850 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.109 0.079 97 6.66 0.079 0 54774.5020090106_1713-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 04, 05:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org