IOTA/IOTA-ES occultation update for (2149) Schwambraniya / TYC 1235-00223-1 event on 2007 Oct 03, 20:30 UT Visible from Australia Summary ------- On 2007 Oct 03 UT, the 15 km diameter asteroid (2149) Schwambraniya will occult a 10.0 mag star in the constellation Taurus for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.9 mag to 15.9 mag (the magnitude of the asteroid) for at most 3.4 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: 12 * date and approx. time of event: 2007 Oct 03, 20:08 - 2007 Oct 03, 20:52 UT * magnitude of target star: 10.0 * magnitude drop [mag]: 5.9 * estimated maximum duration [s]: 3.4 * Moon: 45 % sunlit, 51° distance * Sun: 134° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 5.35 * 1 sigma uncertainty interval [seconds]: +/- 19.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .068 +/- .059) * 1 sigma uncertainty ellipse (major, minor, PA): ( .070", .057", 68° ) * approx speed of asteroid's shadow [km/s]: 4.3532 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1235-00223-1 by 2149 Schwambraniya on 2007 Oct 03 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 8 0 0 -25 32 23 20 52 5 1 73 -44 -25 27 31 -25 37 15 .. .. .. -26 29 39 9 0 0 -25 15 53 20 52 5 1 72 -45 -25 11 1 -25 20 45 .. .. .. -26 13 6 10 0 0 -24 59 27 20 52 4 2 72 -46 -24 54 35 -25 4 19 .. .. .. -25 56 39 11 0 0 -24 43 6 20 52 2 3 72 -47 -24 38 14 -24 47 58 .. .. .. -25 40 15 12 0 0 -24 26 49 20 52 1 4 71 -48 -24 21 58 -24 31 41 .. .. .. -25 23 57 13 0 0 -24 10 38 20 51 58 5 71 -49 -24 5 47 -24 15 30 .. .. .. -25 7 43 14 0 0 -23 54 33 20 51 56 6 70 -49 -23 49 42 -23 59 24 -22 58 3 -24 51 35 15 0 0 -23 38 34 20 51 53 7 70 -50 -23 33 43 -23 43 25 -22 42 6 -24 35 33 16 0 0 -23 22 40 20 51 49 8 70 -51 -23 17 50 -23 27 31 -22 26 15 -24 19 38 17 0 0 -23 6 54 20 51 45 9 69 -52 -23 2 3 -23 11 44 -22 10 31 -24 3 48 18 0 0 -22 51 14 20 51 41 10 69 -53 -22 46 24 -22 56 4 -21 54 54 -23 48 6 19 0 0 -22 35 42 20 51 36 11 68 -54 -22 30 52 -22 40 32 -21 39 24 -23 32 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4 167 0 0 -23 56 55 20 9 47 14 294 22 -23 52 4 -24 1 46 -23 0 30 -24 53 51 168 0 0 -24 12 46 20 9 40 13 294 23 -24 7 55 -24 17 37 -23 16 19 -25 9 45 169 0 0 -24 28 42 20 9 34 12 293 24 -24 23 51 -24 33 33 -23 32 13 -25 25 43 170 0 0 -24 44 43 20 9 29 12 293 24 -24 39 52 -24 49 35 -23 48 12 -25 41 47 171 0 0 -25 0 49 20 9 24 11 292 25 -24 55 58 -25 5 41 -24 4 16 -25 57 55 172 0 0 -25 17 0 20 9 19 10 292 26 -25 12 8 -25 21 51 -24 20 24 -26 14 7 173 0 0 -25 33 14 20 9 15 9 292 27 -25 28 22 -25 38 6 -24 36 36 -26 30 24 174 0 0 -25 49 32 20 9 11 8 291 28 -25 44 40 -25 54 24 -24 52 53 -26 46 44 175 0 0 -26 5 54 20 9 7 7 291 29 -26 1 2 -26 10 46 -25 9 12 -27 3 7 176 0 0 -26 22 18 20 9 4 6 290 29 -26 17 26 -26 27 11 -25 25 35 -27 19 33 177 0 0 -26 38 45 20 9 2 5 290 30 -26 33 53 -26 43 38 .. .. .. -27 36 2 178 0 0 -26 55 15 20 9 0 4 289 31 -26 50 23 -27 0 8 .. .. .. -27 52 33 179 0 0 -27 11 46 20 8 58 3 289 32 -27 6 54 -27 16 39 .. .. .. -28 9 6 180 0 0 -27 28 20 20 8 57 2 288 33 -27 23 27 -27 33 12 .. .. .. -28 25 40 -179 0 0 -27 44 54 20 8 56 1 288 33 -27 40 1 -27 49 47 .. .. .. -28 42 16 -178 0 0 -28 1 29 20 8 56 0 288 34 -27 56 37 -28 6 22 .. .. .. -28 58 52 Data for the target star ------------------------ * name: TYC 1235-00223-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 40 16.5000 DE: +15 12 01.638 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .018 ) * V mag [mag]: 10.0 * B mag [mag]: 11.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2149) Schwambraniya approx. diameter [km]: 15 approx. diameter ["]: .011 distance from Earth [AU]: 1.81600 * orbital information: orbit source: Preston date of fit: 2007 Sep 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 472 number of rejected observations: 40 time covered by the observations: 1954 Nov 16 - 2007 Sep 14 1 sigma uncertainty ellipse (major, minor, PA): 0.068, 0.054, 67° remarks: * orbital elements for (2149) Schwambraniya : Mean anomaly = 96.68088699 deg Arg. of pericenter = 228.97815339 deg Long. of node = 62.67062560 deg Inclination = 7.71870796 deg Eccentricity = 0.10550615 Semimajor axis = 2.54995801 AU Perihelion dist = 2.28092177 AU Mag: H = 11.57, G = 0.15 Epoch of elements : MJD 54376.85500000 TDT (2007 Oct 03.855) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 03 2149 Schwambraniya 20h 30.5m UT 10.0 3 40 16.500 15 12 1.64TYC 1235-00223-1 11.2 15.9 15 3.4 1.816 -0.824 0.26 -264.718 15.200 -130.36 -4.06 20.5082 -.00945 -.46628 -2.45647 0.05508 -0.00408 -0.00066 2000 95.02163632007 927.00000228.978153 62.670626 7.7187080.105506152.549958012.2809217711.75 0.15 RATE 2.4204969 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.070 0.057 68.4 6.350 0.061 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 25, 22:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org