IOTA/IOTA-ES occultation update for (1094) Siberia / TYC 5017-00025-1 event on 2008 Mar 31, 04:58 UT Visible from NE Brazil, USA, Canada Summary ------- On 2008 Mar 31 UT, the 18 km diameter asteroid (1094) Siberia will occult a 10.4 mag star in the constellation Serpens for observers along a path across NE Brazil, USA, Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.9 mag to 16.3 mag (the magnitude of the asteroid) for at most 2.2 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: 16 * date and approx. time of event: 2008 Mar 31, 04:46 - 2008 Mar 31, 05:11 UT * midpoint of event [JD]: 2454556.70741667 * magnitude of target star: 10.4 * magnitude drop [mag]: 5.9 * estimated maximum duration [s]: 2.2 * Moon: 37 % sunlit, 65° distance * Sun: 134° distance * rough path description: NE Brazil, USA, Canada The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 4.29 * 1 sigma uncertainty interval [seconds]: +/- 8.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .062 +/- .045) * 1 sigma uncertainty ellipse (major, minor, PA): ( .063", .043", 105° ) * approx speed of asteroid's shadow [km/s]: 8.2824 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5017-00025-1 by 1094 Siberia on 2008 Mar 31 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 -113 20 26 53 0 0 5 11 10 4 96 -25 -112 19 26 -114 30 29 -106 10 49 ... .. .. -104 59 38 52 0 0 5 11 1 9 103 -29 -104 28 54 -105 31 21 -100 35 6 -111 6 18 Latitude Latitude Latitude Latitude -104 0 0 51 49 53 5 11 0 10 104 -29 51 55 2 51 44 44 52 39 6 51 0 31 -103 0 0 51 39 2 5 10 58 11 104 -30 51 44 12 51 33 52 52 28 28 50 49 26 -102 0 0 51 27 29 5 10 56 11 105 -30 51 32 41 51 22 18 52 17 10 50 37 39 -101 0 0 51 15 15 5 10 55 12 106 -31 51 20 28 51 10 2 52 5 11 50 25 10 -100 0 0 51 2 18 5 10 53 13 107 -31 51 7 33 50 57 3 51 52 29 50 11 57 - 99 0 0 50 48 37 5 10 51 13 107 -32 50 53 53 50 43 20 51 39 5 49 57 59 - 98 0 0 50 34 11 5 10 48 14 108 -32 50 39 30 50 28 53 51 24 57 49 43 15 - 97 0 0 50 19 0 5 10 46 15 109 -33 50 24 20 50 13 39 51 10 5 49 27 45 - 96 0 0 50 3 2 5 10 44 15 110 -33 50 8 24 49 57 39 50 54 26 49 11 28 - 95 0 0 49 46 16 5 10 41 16 110 -34 49 51 40 49 40 51 50 38 1 48 54 21 - 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20 0 0 -42 16 36 4 50 32 48 351 -31 -42 4 23 -42 28 51 -40 20 44 -44 15 12 - 19 0 0 -43 54 24 4 50 14 46 350 -29 -43 42 15 -44 6 34 -41 59 16 -45 52 12 - 18 0 0 -45 28 46 4 49 57 44 349 -28 -45 16 44 -45 40 51 -43 34 32 -47 25 38 - 17 0 0 -46 59 40 4 49 42 43 348 -27 -46 47 44 -47 11 38 -45 6 27 -48 55 26 - 16 0 0 -48 27 3 4 49 27 41 347 -26 -48 15 14 -48 38 53 -46 34 58 -50 21 34 - 15 0 0 -49 50 53 4 49 13 40 346 -25 -49 39 12 -50 2 35 -48 0 4 -51 44 3 - 14 0 0 -51 11 11 4 49 1 38 345 -23 -50 59 39 -51 22 44 -49 21 44 -53 2 53 - 13 0 0 -52 27 59 4 48 49 37 344 -22 -52 16 37 -52 39 23 -50 40 0 -54 18 8 - 12 0 0 -53 41 22 4 48 38 36 343 -21 -53 30 9 -53 52 35 -51 54 55 -55 29 52 - 11 0 0 -54 51 23 4 48 28 34 342 -20 -54 40 21 -55 2 26 -53 6 31 -56 38 11 - 10 0 0 -55 58 7 4 48 18 33 342 -19 -55 47 16 -56 9 0 -54 14 54 -57 43 12 - 9 0 0 -57 1 42 4 48 10 32 341 -19 -56 51 1 -57 12 24 -55 20 9 -58 45 0 - 8 0 0 -58 2 14 4 48 1 31 340 -18 -57 51 44 -58 12 45 -56 22 23 -59 43 43 - 7 0 0 -58 59 49 4 47 54 30 339 -17 -58 49 30 -59 10 9 -57 21 41 -60 39 30 - 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2007 Apr 22 1 sigma uncertainty ellipse (major, minor, PA): 0.060, 0.035, 107° remarks: * orbital elements for (1094) Siberia : Mean anomaly = 106.17952841 deg Arg. of pericenter = 309.50221870 deg Long. of node = 149.21475495 deg Inclination = 14.01891792 deg Eccentricity = 0.13457148 Semimajor axis = 2.54419590 AU Perihelion dist = 2.20181970 AU Mag: H = 11.58, G = 0.15 Epoch of elements : MJD 54556.20700000 TDT (2008 Mar 31.207) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 31 1094 Siberia 4h 58.7m UT 10.4 15 42 24.370- 0 20 20.02TYC 5017-00025-1 11.3 16.3 18 2.2 1.886 -0.610 19.80 -28.0127 -0.345 106.37 4.30 4.9780 -0.19031 -0.08757 -1.95750 4.24522 -0.00411 -0.00039 2000 104.6720192008 325.00000309.502219149.214755 14.0189180.13457148 2.5441959 2.201819711.9 5.00.15 RATE 2.4287240 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.063 0.043 105 5.29 0.056 0 54511.5020080331_0025-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 15, 00:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org