IOTA/IOTA-ES occultation update for (817) Annika / TYC 1400-00474-1 event on 2012 Feb 08, 17:49 UT Visible from Philippines, China, Russia, Europe Summary ------- On 2012 Feb 08 UT, the 23 km diameter asteroid (817) Annika will occult a 9.2 mag star in the constellation Cancer for observers along a path across Philippines, China, Russia, Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.7 mag to 13.9 mag (the magnitude of the asteroid) for at most 2.0 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: 39 * date and approx. time of event: 2012 Feb 08, 17:40 - 2012 Feb 08, 17:58 UT * geocentric midpoint of event [JD]: 2455966.2427375 * magnitude of target star: 9.2 * magnitude drop [mag]: 4.7 * estimated maximum duration [s]: 2.0 * Moon: 99 % sunlit, 20° distance * Sun: 172° distance * rough path description: Philippines, China, Russia, Europe The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 1.69 * 1 sigma uncertainty interval [seconds]: +/- 3.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .043 +/- .033) * 1 sigma uncertainty ellipse (major, minor, PA): ( .043", .033", 94° ) * approx speed of asteroid's shadow [km/s]: 11.5681 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1400-00474-1 by 817 Annika on 2012 Feb 8 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 ' " Longitude Longitude Longitude Longitude 172 30 20 -22 0 0 17 40 31 0 292 -9 172 48 28 172 12 21 ... .. .. 171 12 26 169 57 11 -21 0 0 17 40 31 3 293 -11 170 14 11 169 40 18 171 12 25 168 43 55 Latitude Latitude Latitude Latitude 168 0 0 -20 11 6 17 40 33 5 294 -13 -20 4 10 -20 18 2 -19 40 42 -20 41 28 167 0 0 -19 45 4 17 40 34 6 294 -14 -19 38 6 -19 52 2 -19 14 32 -20 15 33 166 0 0 -19 18 20 17 40 35 7 294 -15 -19 11 21 -19 25 20 -18 47 41 -19 48 57 165 0 0 -18 50 56 17 40 36 8 295 -16 -18 43 55 -18 57 57 -18 20 9 -19 21 40 164 0 0 -18 22 51 17 40 38 9 295 -17 -18 15 48 -18 29 54 -17 51 56 -18 53 43 163 0 0 -17 54 5 17 40 39 10 295 -18 -17 47 0 -18 1 10 -17 23 3 -18 25 5 162 0 0 -17 24 38 17 40 41 11 295 -19 -17 17 32 -17 31 45 -16 53 28 -17 55 46 161 0 0 -16 54 31 17 40 44 12 296 -20 -16 47 23 -17 1 40 -16 23 13 -17 25 46 160 0 0 -16 23 43 17 40 46 13 296 -22 -16 16 33 -16 30 54 -15 52 17 -16 55 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24 51 - 11 0 0 44 37 51 17 58 28 8 70 0 44 44 38 44 31 5 45 7 32 44 8 13 Uncertainty in time = +/- 4 secs Prediction of 2012 Jan 26.0 Data for the target star ------------------------ * name: TYC 1400-00474-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 58 41.0313 DE: +20 11 11.413 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .025 ) * V mag [mag]: 9.2 * B mag [mag]: 10.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (817) Annika approx. diameter [km]: 23 approx. diameter ["]: .021 distance from Earth [AU]: 1.48500 * orbital information: orbit source: Preston date of fit: 2012 Jan 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 958 number of rejected observations: 42 time covered by the observations: 1916 Feb 06 - 2012 Jan 14 1 sigma uncertainty ellipse (major, minor, PA): 0.034, 0.021, 96° remarks: * orbital elements for (817) Annika : Mean anomaly = 64.58318450 deg Arg. of pericenter = 284.35403425 deg Long. of node = 125.65273867 deg Inclination = 11.33957277 deg Eccentricity = 0.17907277 Semimajor axis = 2.58956026 AU Perihelion dist = 2.12584052 AU Mag: H = 10.56, G = 0.15 Epoch of elements : MJD 55965.74300000 TDT (2012 Feb 08.743) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Feb 8 817 Annika 17h 49.5m UT 9.2 8 58 41.031 20 11 11.41TYC 1400-00474-1 10.7 13.9 23 2.0 1.485 -2.279 21.55 89.0342 20.181 -83.85 -15.01 17.8257 0.10046 0.14866 -5.42006 3.64083 0.00067 -0.00050 2000 63.2248582012 2 3.00000284.354034125.652739 11.3395730.17907277 2.5895603 2.125840510.8 5.00.15 RATE 2.3651850 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.043 0.033 94 2.69 0.036 0 0 3 3 055952.0020120208_0474-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jan 26, 12:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org