IOTA/IOTA-ES occultation update for (386) Siegena / TYC 0893-00214-1 event on 2008 May 05, 08:17 UT Visible from Pacific Ocean Summary ------- On 2008 May 05 UT, the 165 km diameter asteroid (386) Siegena will occult a 11.3 mag star in the constellation Bootes for observers along a path across Pacific Ocean. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.6 mag to 12.6 mag (the magnitude of the asteroid) for at most 12.5 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: 99 * date and approx. time of event: 2008 May 05, 08:09 - 2008 May 05, 08:24 UT * magnitude of target star: 11.3 * magnitude drop [mag]: 1.6 * estimated maximum duration [s]: 12.5 * Moon: 0 % sunlit, 148° distance * Sun: 150° distance * rough path description: Pacific Ocean The occultation path -------------------- * approximate projected width [km]: 166 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 3.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .027 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .027", 0° ) * approx speed of asteroid's shadow [km/s]: 13.2170 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0893-00214-1 by 386 Siegena on 2008 May 5 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 150 0 0 20 17 49 8 24 21 25 89 -1 21 2 46 19 32 48 21 31 30 19 3 57 151 0 0 20 15 55 8 24 17 26 89 -2 21 0 53 19 30 54 21 29 37 19 2 3 152 0 0 20 13 36 8 24 14 26 90 -2 20 58 34 19 28 34 21 27 19 18 59 42 153 0 0 20 10 51 8 24 10 27 90 -3 20 55 50 19 25 48 21 24 36 18 56 56 154 0 0 20 7 40 8 24 7 28 90 -4 20 52 41 19 22 36 21 21 27 18 53 43 155 0 0 20 4 4 8 24 3 29 90 -5 20 49 6 19 18 59 21 17 53 18 50 5 156 0 0 20 0 3 8 23 59 30 91 -6 20 45 5 19 14 56 21 13 53 18 46 1 157 0 0 19 55 35 8 23 55 31 91 -7 20 40 40 19 10 27 21 9 29 18 41 31 158 0 0 19 50 43 8 23 51 32 91 -8 20 35 49 19 5 33 21 4 39 18 36 36 159 0 0 19 45 25 8 23 47 33 92 -9 20 30 33 19 0 13 20 59 24 18 31 15 160 0 0 19 39 41 8 23 42 34 92 -10 20 24 51 18 54 27 20 53 44 18 25 28 161 0 0 19 33 32 8 23 38 35 92 -10 20 18 44 18 48 16 20 47 38 18 19 16 162 0 0 19 26 58 8 23 33 36 92 -11 20 12 12 18 41 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-29 56 49 8 9 7 4 283 -30 -29 10 48 -30 42 55 -28 41 23 -31 12 27 - 58 0 0 -30 8 11 8 9 7 3 282 -29 -29 22 15 -30 54 12 -28 52 52 -31 23 42 - 57 0 0 -30 19 9 8 9 6 2 282 -29 -29 33 17 -31 5 6 -29 3 57 -31 34 33 - 56 0 0 -30 29 43 8 9 6 1 281 -28 -29 43 55 -31 15 36 -29 14 38 -31 45 0 - 55 0 0 -30 39 53 8 9 6 0 281 -27 -29 54 9 -31 25 42 -29 24 54 -31 55 3 Uncertainty in time = +/- 4 secs [Prediction of 2008 Apr 23.0] Data for the target star ------------------------ * name: TYC 0893-00214-1 * constellation : Bootes * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 13 46 16.1674 DE: +09 16 51.264 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .027 ) * V mag [mag]: 11.3 * B mag [mag]: 11.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (386) Siegena approx. diameter [km]: 165 approx. diameter ["]: .092 distance from Earth [AU]: 2.48300 * orbital information: orbit source: Preston date of fit: 2008 Apr 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 885 number of rejected observations: 113 time covered by the observations: 1900 Apr 25 - 2008 Apr 18 1 sigma uncertainty ellipse (major, minor, PA): 0.014, 0.011, 93° remarks: * orbital elements for (386) Siegena : Mean anomaly = 184.38733089 deg Arg. of pericenter = 219.99906201 deg Long. of node = 166.94038997 deg Inclination = 20.25912381 deg Eccentricity = 0.17312342 Semimajor axis = 2.89331736 AU Perihelion dist = 2.39241635 AU Mag: H = 7.57, G = 0.16 Epoch of elements : MJD 54591.34500000 TDT (2008 May 05.345) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 5 386 Siegena 8h 17.1m UT 11.3 13 46 16.167 9 16 51.26TYC 0893-00214-1 11.9 12.6 165 12.5 2.483 -1.619 11.08 -141.2843 9.278 54.90 16.40 8.2849 -0.04551 -0.09715 -6.77050 3.13257 0.00154 -0.00248 2000 184.1179722008 5 4.00000219.999062166.940390 20.2591240.17312342 2.8933174 2.3924164 7.4 5.00.16 RATE 2.0026720 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.027 0 1.32 0.029 0 54579.5020080505_0214-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 23, 03:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org