IOTA/IOTA-ES occultation update for (1618) Dawn / TYC 1325-01182-1 event on 2008 Dec 02, 00:25 UT Visible from Russia, Scandanavia, E Canada Summary ------- On 2008 Dec 02 UT, the 20 km diameter asteroid (1618) Dawn will occult a 10.4 mag star in the constellation Gemini for observers along a path across Russia, Scandanavia, E Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.5 mag to 15.9 mag (the magnitude of the asteroid) for at most 1.7 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: 29 * date and approx. time of event: 2008 Dec 02, 00:18 - 2008 Dec 02, 00:32 UT * magnitude of target star: 10.4 * magnitude drop [mag]: 5.5 * estimated maximum duration [s]: 1.7 * Moon: 16 % sunlit, 154° distance * Sun: 159° distance * rough path description: Russia, Scandanavia, E Canada The occultation path -------------------- * approximate projected width [km]: 27 * 1 sigma uncertainty interval [path widths]: +/- 2.28 * 1 sigma uncertainty interval [seconds]: +/- 5.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .044 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .044", .032", 87° ) * approx speed of asteroid's shadow [km/s]: 11.4800 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1325-01182-1 by 1618 Dawn on 2008 Dec 2 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 - 99 0 0 42 29 44 0 32 3 1 60 -16 42 38 9 42 21 19 43 16 51 .. .. .. - 98 0 0 42 55 34 0 32 3 1 61 -17 43 4 0 42 47 10 43 42 45 .. .. .. - 97 0 0 43 21 20 0 32 3 2 62 -17 43 29 46 43 12 54 44 8 32 .. .. .. - 96 0 0 43 46 58 0 32 2 3 62 -18 43 55 25 43 38 33 44 34 13 .. .. .. - 95 0 0 44 12 30 0 32 2 4 63 -19 44 20 57 44 4 4 44 59 47 .. .. .. - 94 0 0 44 37 54 0 32 1 5 64 -20 44 46 21 44 29 28 45 25 12 43 51 17 - 93 0 0 45 3 9 0 32 0 6 65 -21 45 11 37 44 54 43 45 50 29 44 16 31 - 92 0 0 45 28 16 0 31 59 6 65 -21 45 36 44 45 19 49 46 15 36 44 41 36 - 91 0 0 45 53 13 0 31 57 7 66 -22 46 1 40 45 44 46 46 40 34 45 6 32 - 90 0 0 46 17 59 0 31 56 8 67 -23 46 26 27 46 9 32 47 5 21 45 31 18 - 89 0 0 46 42 34 0 31 54 9 67 -24 46 51 2 46 34 8 47 29 56 45 55 54 - 88 0 0 47 6 59 0 31 53 10 68 -24 47 15 27 46 58 32 47 54 20 46 20 18 - 87 0 0 47 31 11 0 31 51 10 69 -25 47 39 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45 30 58 45 14 6 46 9 47 44 35 56 100 0 0 44 57 38 0 19 5 18 283 -4 45 6 4 44 49 12 45 44 52 44 11 4 101 0 0 44 32 35 0 19 2 18 284 -3 44 41 2 44 24 10 45 19 48 43 46 3 102 0 0 44 7 25 0 18 58 17 284 -2 44 15 51 43 59 0 44 54 36 43 20 55 103 0 0 43 42 8 0 18 55 16 285 -1 43 50 33 43 33 43 44 29 17 42 55 39 104 0 0 43 16 43 0 18 52 15 286 -1 43 25 9 43 8 19 44 3 50 42 30 17 Uncertainty in time = +/- 6 secs [Prediction of 2008 Nov 26.0] Data for the target star ------------------------ * name: TYC 1325-01182-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 02 10.8622 DE: +21 52 40.095 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .016, .017 ) * V mag [mag]: 10.4 * B mag [mag]: 10.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1618) Dawn approx. diameter [km]: 20 approx. diameter ["]: .014 distance from Earth [AU]: 2.00400 * orbital information: orbit source: Preston date of fit: 2008 Oct 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 876 number of rejected observations: 37 time covered by the observations: 1948 Jul 05 - 2008 Oct 29 1 sigma uncertainty ellipse (major, minor, PA): 0.041, 0.027, 87° remarks: * orbital elements for (1618) Dawn : Mean anomaly = 166.67296299 deg Arg. of pericenter = 173.39975696 deg Long. of node = 102.98171486 deg Inclination = 3.22500836 deg Eccentricity = 0.02817580 Semimajor axis = 2.86906591 AU Perihelion dist = 2.78822769 AU Mag: H = 11.09, G = 0.15 Epoch of elements : MJD 54802.01700000 TDT (2008 Dec 02.017) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Dec 2 1618 Dawn 0h 25.2m UT 10.4 6 2 10.862 21 52 40.10TYC 1325-01182-1 10.9 15.9 20 1.7 2.004 -2.039 1.81 13.0084 21.878 171.04 -21.98 0.4206 0.04331 0.67298 -6.46657 0.41126 -0.00207 0.00016 2000 166.26389220081130.00000173.399757102.981715 3.2250080.02817580 2.8690659 2.788227711.5 5.00.15 RATE 2.0281180 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.044 0.032 87 3.28 0.031 0 54796.5020081202_1182-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 26, 23:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org