IOTA/IOTA-ES occultation update for (640) Brambilla / 2UCAC 33149531 event on 2008 Jul 10, 18:15 UT Visible from New Zealand, Australia, Africa Summary ------- On 2008 Jul 10 UT, the 81 km diameter asteroid (640) Brambilla will occult a 12.9 mag star in the constellation Equuleus for observers along a path across New Zealand, Australia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.2 mag to 13.7 mag (the magnitude of the asteroid) for at most 9.3 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 65 * date and approx. time of event: 2008 Jul 10, 18:04 - 2008 Jul 10, 18:27 UT * magnitude of target star: 12.9 * magnitude drop [mag]: 1.2 * estimated maximum duration [s]: 9.3 * Moon: 56 % sunlit, 117° distance * Sun: 142° distance * rough path description: New Zealand, Australia, Africa The occultation path -------------------- * approximate projected width [km]: 87 * 1 sigma uncertainty interval [path widths]: +/- 0.92 * 1 sigma uncertainty interval [seconds]: +/- 8.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .051 +/- .048) * 1 sigma uncertainty ellipse (major, minor, PA): ( .051", .048", 87° ) * approx speed of asteroid's shadow [km/s]: 8.6436 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 33149531 by 640 Brambilla on 2008 Jul 10 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 24 0 0 - 5 22 55 18 27 5 1 86 -29 - 4 59 12 - 5 46 43 .. .. .. - 6 30 39 25 0 0 - 5 19 27 18 27 4 1 86 -30 - 4 55 44 - 5 43 14 - 4 12 17 - 6 27 9 26 0 0 - 5 16 18 18 27 4 2 86 -31 - 4 52 36 - 5 40 5 - 4 9 10 - 6 23 59 27 0 0 - 5 13 29 18 27 3 3 86 -32 - 4 49 48 - 5 37 15 - 4 6 22 - 6 21 9 28 0 0 - 5 11 0 18 27 2 4 86 -33 - 4 47 19 - 5 34 45 - 4 3 54 - 6 18 38 29 0 0 - 5 8 50 18 27 1 5 86 -34 - 4 45 9 - 5 32 34 - 4 1 45 - 6 16 26 30 0 0 - 5 6 59 18 27 0 6 86 -35 - 4 43 19 - 5 30 43 - 3 59 55 - 6 14 35 31 0 0 - 5 5 28 18 26 58 7 86 -35 - 4 41 48 - 5 29 12 - 3 58 25 - 6 13 2 32 0 0 - 5 4 16 18 26 56 8 86 -36 - 4 40 37 - 5 28 0 - 3 57 14 - 6 11 50 33 0 0 - 5 3 24 18 26 54 9 86 -37 - 4 39 45 - 5 27 7 - 3 56 23 - 6 10 57 34 0 0 - 5 2 51 18 26 52 10 85 -38 - 4 39 12 - 5 26 34 - 3 55 50 - 6 10 23 35 0 0 - 5 2 37 18 26 49 11 85 -39 - 4 38 58 - 5 26 20 - 3 55 37 - 6 10 9 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37 53 -36 55 5 -177 0 0 -35 55 42 18 4 57 18 289 -11 -35 31 36 -36 19 52 -34 47 26 -37 4 31 -176 0 0 -36 4 57 18 4 53 18 288 -10 -35 40 52 -36 29 6 -34 56 45 -37 13 43 -175 0 0 -36 13 59 18 4 50 17 287 -9 -35 49 55 -36 38 6 -35 5 50 -37 22 41 -174 0 0 -36 22 46 18 4 47 16 287 -8 -35 58 44 -36 46 53 -35 14 41 -37 31 25 -173 0 0 -36 31 20 18 4 44 15 286 -8 -36 7 19 -36 55 25 -35 23 18 -37 39 55 -172 0 0 -36 39 40 18 4 41 14 286 -7 -36 15 40 -37 3 44 -35 31 41 -37 48 11 -171 0 0 -36 47 45 18 4 38 14 285 -6 -36 23 47 -37 11 48 -35 39 50 -37 56 13 -170 0 0 -36 55 36 18 4 36 13 284 -6 -36 31 39 -37 19 38 -35 47 45 -38 4 1 -169 0 0 -37 3 13 18 4 33 12 284 -5 -36 39 17 -37 27 14 -35 55 25 -38 11 35 -168 0 0 -37 10 36 18 4 31 11 283 -4 -36 46 41 -37 34 35 -36 2 51 -38 18 54 -167 0 0 -37 17 44 18 4 29 10 283 -4 -36 53 50 -37 41 42 -36 10 2 -38 25 59 -166 0 0 -37 24 38 18 4 27 10 282 -3 -37 0 45 -37 48 34 -36 16 58 -38 32 49 -165 0 0 -37 31 17 18 4 25 9 281 -2 -37 7 25 -37 55 12 -36 23 41 -38 39 25 -164 0 0 -37 37 41 18 4 24 8 281 -2 -37 13 50 -38 1 36 -36 30 8 -38 45 46 -163 0 0 -37 43 51 18 4 22 7 280 -1 -37 20 1 -38 7 44 -36 36 21 -38 51 53 -162 0 0 -37 49 46 18 4 21 6 280 0 -37 25 57 -38 13 38 -36 42 18 -38 57 45 Uncertainty in time = +/- 9 secs [Prediction of 2008 Jul 3.0] Data for the target star ------------------------ * name: 2UCAC 33149531 * constellation : Equuleus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 15 26.5897 DE: +03 33 41.342 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .046, .046 ) * V mag [mag]: 12.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (640) Brambilla approx. diameter [km]: 81 approx. diameter ["]: .053 distance from Earth [AU]: 2.09400 * orbital information: orbit source: Preston date of fit: 2008 Jul 02 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 797 number of rejected observations: 64 time covered by the observations: 1907 Aug 29 - 2008 Jun 25 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.014, 72° remarks: * orbital elements for (640) Brambilla : Mean anomaly = 36.99271563 deg Arg. of pericenter = 33.42423980 deg Long. of node = 235.00744960 deg Inclination = 13.37219355 deg Eccentricity = 0.08165456 Semimajor axis = 3.15999686 AU Perihelion dist = 2.90196870 AU Mag: H = 9.06, G = 0.15 Epoch of elements : MJD 54657.76100000 TDT (2008 Jul 10.761) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 10 640 Brambilla 18h 15.7m UT 12.9 21 15 26.590 3 33 41.342UCAC 33149531 0.0 13.7 81 9.3 2.094 -1.313 5.80 115.9048 3.559 -92.54 22.11 18.2610 -0.10519 -0.35715 -4.67829 1.38383 -0.00245 -0.00238 2000 35.6309842008 7 3.00000 33.424240235.007450 13.3721940.08165456 3.1599969 2.9019687 9.0 5.00.15 RATE 1.7545830 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.051 0.048 87 1.92 0.049 0 54650.5020080710_149531 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jul 03, 00:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org