IOTA/IOTA-ES occultation update for (2283) Bunke / TYC 5739-01486-1 event on 2007 Aug 05, 05:24 UT Visible from Brazil, Bolivia Summary ------- On 2007 Aug 05 UT, the 10 km diameter asteroid (2283) Bunke will occult a 10.2 mag star in the constellation Aquila for observers along a path across Brazil, Bolivia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.5 mag to 15.7 mag (the magnitude of the asteroid) for at most 1.0 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: 12 * date and approx. time of event: 2007 Aug 05, 05:14 - 2007 Aug 05, 05:34 UT * midpoint of event [JD]: 2454317.7253125 * magnitude of target star: 10.2 * magnitude drop [mag]: 5.5 * estimated maximum duration [s]: 1.0 * Moon: 58 % sunlit, 91° distance * Sun: 164° distance * rough path description: Brazil, Bolivia The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 5.57 * 1 sigma uncertainty interval [seconds]: +/- 8.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .086 +/- .055) * 1 sigma uncertainty ellipse (major, minor, PA): ( .087", .054", 80° ) * approx speed of asteroid's shadow [km/s]: 9.8475 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5739-01486-1 by 2283 Bunke on 2007 Aug 05 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 167 0 0 -39 21 37 5 34 43 0 101 4 -39 18 43 -39 24 30 .. .. .. -39 56 48 168 0 0 -39 30 56 5 34 42 1 101 4 -39 28 3 -39 33 50 .. .. .. -40 6 5 169 0 0 -39 39 55 5 34 42 2 100 3 -39 37 2 -39 42 49 .. .. .. -40 15 2 170 0 0 -39 48 34 5 34 42 3 100 2 -39 45 41 -39 51 27 .. .. .. -40 23 37 171 0 0 -39 56 52 5 34 41 3 99 1 -39 53 59 -39 59 45 -39 21 57 -40 31 53 172 0 0 -40 4 49 5 34 41 4 98 1 -40 1 57 -40 7 42 -39 29 57 -40 39 48 173 0 0 -40 12 26 5 34 40 5 98 0 -40 9 34 -40 15 18 -39 37 36 -40 47 23 174 0 0 -40 19 43 5 34 39 6 97 -1 -40 16 50 -40 22 35 -39 44 55 -40 54 37 175 0 0 -40 26 39 5 34 38 7 96 -2 -40 23 47 -40 29 31 -39 51 53 -41 1 31 176 0 0 -40 33 15 5 34 37 7 96 -2 -40 30 23 -40 36 7 -39 58 31 -41 8 5 177 0 0 -40 39 31 5 34 36 8 95 -3 -40 36 39 -40 42 22 -40 4 49 -41 14 19 178 0 0 -40 45 26 5 34 34 9 94 -4 -40 42 35 -40 48 18 -40 10 46 -41 20 13 179 0 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5 14 15 7 261 -19 2 49 31 2 43 43 3 21 46 2 11 21 - 7 0 0 2 58 41 5 14 14 6 261 -18 3 1 35 2 55 48 3 33 48 2 23 28 - 6 0 0 3 10 22 5 14 13 5 261 -17 3 13 15 3 7 28 3 45 26 2 35 11 - 5 0 0 3 21 38 5 14 12 4 261 -16 3 24 31 3 18 45 .. .. .. 2 46 30 - 4 0 0 3 32 30 5 14 11 3 261 -15 3 35 23 3 29 36 .. .. .. 2 57 23 - 3 0 0 3 42 56 5 14 11 2 261 -14 3 45 49 3 40 3 .. .. .. 3 7 53 - 2 0 0 3 52 59 5 14 10 1 261 -13 3 55 51 3 50 6 .. .. .. 3 17 57 Data for the target star ------------------------ * name: TYC 5739-01486-1 * constellation : Aquila * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 03 59.7620 DE: -09 02 55.157 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .020 ) * V mag [mag]: 10.2 * B mag [mag]: 11.8 * Apparent position with proper motion RA(deg): 301.1095633081 DE(deg): -9.0270950704 * Equation of equinoxes (radians) : 0.000032012289531 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2283) Bunke approx. diameter [km]: 10 approx. diameter ["]: .010 distance from Earth [AU]: 1.34800 * orbital information: orbit source: Preston date of fit: 2007 Jul 01 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 734 number of rejected observations: 35 time covered by the observations: 1951 Dec 21 - 2007 Jun 20 1 sigma uncertainty ellipse (major, minor, PA): 0.085, 0.050, 80° remarks: * orbital elements for (2283) Bunke : Mean anomaly = 113.52821730 deg Arg. of pericenter = 346.68949879 deg Long. of node = 196.90679374 deg Inclination = 6.73102332 deg Eccentricity = 0.08774587 Semimajor axis = 2.24864745 AU Perihelion dist = 2.05133792 AU Mag: H = 12.32, G = 0.15 Epoch of elements : MJD 54317.22500000 TDT (2007 Aug 05.225) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 05 2283 Bunke 5h 24.5m UT 10.2 20 3 59.762- 9 2 55.16TYC 5739-01486-1 11.8 15.7 10 1.0 1.348 -2.271 -13.49 266.496 -9.045 100.41 17.07 5.4075 .11374 -.28439 -5.15947 -2.06720 0.00119 -0.00079 2000 111.4163822007 729.00000346.689499196.906794 6.7310230.087745872.248647452.0513379212.75 0.15 RATE 2.9229540 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.087 0.054 80.5 6.570 0.056 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 09, 20:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org