IOTA/IOTA-ES occultation update for (844) Leontina / TYC 2416-00841-1 event on 2008 Dec 03, 19:07 UT Visible from N Russia, Scandanavia, UK Summary ------- On 2008 Dec 03 UT, the 66 km diameter asteroid (844) Leontina will occult a 11.4 mag star in the constellation Auriga for observers along a path across N Russia, Scandanavia, UK. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.9 mag to 14.2 mag (the magnitude of the asteroid) for at most 5.0 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: 83 * date and approx. time of event: 2008 Dec 03, 19:02 - 2008 Dec 03, 19:14 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 2.9 * estimated maximum duration [s]: 5.0 * Moon: 29 % sunlit, 126° distance * Sun: 162° distance * rough path description: N Russia, Scandanavia, UK The occultation path -------------------- * approximate projected width [km]: 85 * 1 sigma uncertainty interval [path widths]: +/- 0.64 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .025", 89° ) * approx speed of asteroid's shadow [km/s]: 13.2700 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2416-00841-1 by 844 Leontina on 2008 Dec 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 - 34 0 0 32 26 5 19 14 19 0 46 -2 32 57 43 .. .. .. 33 38 42 .. .. .. - 33 0 0 33 15 4 19 14 19 1 47 -3 33 46 55 32 43 33 34 28 10 .. .. .. - 32 0 0 34 4 14 19 14 19 3 48 -4 34 36 17 33 32 32 35 17 48 .. .. .. - 31 0 0 34 53 32 19 14 18 4 48 -5 35 25 46 34 21 38 36 7 33 33 41 16 - 30 0 0 35 42 55 19 14 17 5 49 -6 36 15 21 35 10 50 36 57 22 34 30 15 - 29 0 0 36 32 21 19 14 16 6 49 -7 37 4 58 36 0 5 37 47 14 35 19 17 - 28 0 0 37 21 47 19 14 14 7 50 -8 37 54 35 36 49 21 38 37 6 36 8 20 - 27 0 0 38 11 11 19 14 13 8 50 -9 38 44 9 37 38 35 39 26 54 36 57 21 - 26 0 0 39 0 31 19 14 11 9 51 -10 39 33 39 38 27 45 40 16 37 37 46 19 - 25 0 0 39 49 42 19 14 9 10 52 -11 40 23 0 39 16 47 41 6 11 38 35 10 - 24 0 0 40 38 44 19 14 6 12 52 -12 41 12 11 40 5 40 41 55 35 39 23 52 - 23 0 0 41 27 34 19 14 4 13 53 -13 42 1 9 40 54 21 42 44 44 40 12 23 - 22 0 0 42 16 9 19 14 1 14 54 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8 30 165 0 0 55 47 41 19 3 50 34 285 -16 56 21 53 55 13 54 57 6 18 54 31 14 166 0 0 55 9 51 19 3 45 34 286 -16 55 44 8 54 35 59 56 28 39 53 53 14 167 0 0 54 31 15 19 3 40 33 287 -15 55 5 35 53 57 19 55 50 11 53 14 29 168 0 0 53 51 53 19 3 35 32 288 -14 54 26 17 53 17 54 55 10 57 52 35 0 169 0 0 53 11 47 19 3 30 31 289 -13 53 46 13 52 37 46 54 30 57 51 54 48 170 0 0 52 30 57 19 3 25 31 290 -13 53 5 25 51 56 54 53 50 11 51 13 55 171 0 0 51 49 24 19 3 20 30 291 -12 52 23 54 51 15 21 53 8 41 50 32 20 172 0 0 51 7 11 19 3 15 29 292 -11 51 41 40 50 33 7 52 26 28 49 50 6 173 0 0 50 24 17 19 3 10 28 293 -10 50 58 46 49 50 14 51 43 34 49 7 13 174 0 0 49 40 45 19 3 5 27 294 -9 50 15 13 49 6 43 50 59 59 48 23 44 175 0 0 48 56 36 19 3 0 26 295 -8 49 31 2 48 22 36 50 15 45 47 39 39 176 0 0 48 11 52 19 2 55 25 296 -7 48 46 15 47 37 54 49 30 55 46 55 0 177 0 0 47 26 34 19 2 51 25 297 -6 48 0 54 46 52 40 48 45 29 46 9 49 178 0 0 46 40 45 19 2 46 24 298 -6 47 15 1 46 6 54 47 59 30 45 24 9 179 0 0 45 54 26 19 2 42 23 299 -5 46 28 37 45 20 40 47 13 0 44 38 0 180 0 0 45 7 40 19 2 38 22 299 -4 45 41 45 44 33 59 46 26 0 43 51 25 -179 0 0 44 20 28 19 2 33 21 300 -3 44 54 27 43 46 53 45 38 34 43 4 26 -178 0 0 43 32 53 19 2 29 20 301 -2 44 6 45 42 59 24 44 50 44 42 17 6 -177 0 0 42 44 57 19 2 26 19 302 -1 43 18 42 42 11 35 44 2 31 41 29 25 Uncertainty in time = +/- 4 secs [Prediction of 2008 Nov 26.0] Data for the target star ------------------------ * name: TYC 2416-00841-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 36 40.9900 DE: +35 48 16.318 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .017 ) * V mag [mag]: 11.4 * B mag [mag]: 11.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (844) Leontina approx. diameter [km]: 66 approx. diameter ["]: .040 distance from Earth [AU]: 2.29800 * orbital information: orbit source: Preston date of fit: 2008 Nov 26 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 721 number of rejected observations: 55 time covered by the observations: 1902 Mar 06 - 2008 Nov 23 1 sigma uncertainty ellipse (major, minor, PA): 0.026, 0.019, 89° remarks: * orbital elements for (844) Leontina : Mean anomaly = 97.78451859 deg Arg. of pericenter = 346.52201548 deg Long. of node = 348.85113161 deg Inclination = 8.78646498 deg Eccentricity = 0.07095724 Semimajor axis = 3.20278649 AU Perihelion dist = 2.97552559 AU Mag: H = 9.57, G = 0.15 Epoch of elements : MJD 54803.79700000 TDT (2008 Dec 03.797) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Dec 3 844 Leontina 19h 8.1m UT 11.4 5 36 40.990 35 48 16.32TYC 2416-00841-1 11.7 14.2 66 5.0 2.298 -2.355 1.02 84.1659 35.805 -109.50 -22.23 19.1349 0.02253 0.62727 -7.48516 0.26790 -0.00131 -0.00133 2000 97.13161020081130.00000346.522015348.851132 8.7864650.07095724 3.2027865 2.9755256 9.4 5.00.15 RATE 1.7195390 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.025 89 1.64 0.025 0 54796.5020081203_0841-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 26, 23:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org