IOTA/IOTA-ES occultation update for (1468) Zomba / TYC 1888-01256-1 event on 2008 Feb 05, 08:16 UT Visible from USA, Mexico, Hawaii Summary ------- On 2008 Feb 05 UT, the 17 km diameter asteroid (1468) Zomba will occult a 9.3 mag star in the constellation Gemini for observers along a path across USA, Mexico, Hawaii. In the case of an occultation, the combined light of the asteroid and the star will drop by 8.3 mag to 17.6 mag (the magnitude of the asteroid) for at most 2.1 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: 24 * date and approx. time of event: 2008 Feb 05, 08:03 - 2008 Feb 05, 08:28 UT * magnitude of target star: 9.3 * magnitude drop [mag]: 8.3 * estimated maximum duration [s]: 2.1 * Moon: 4 % sunlit, 164° distance * Sun: 142° distance * rough path description: USA, Mexico, Hawaii The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 2.78 * 1 sigma uncertainty interval [seconds]: +/- 6.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .049 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .049", .034", 99° ) * approx speed of asteroid's shadow [km/s]: 8.2570 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1888-01256-1 by 1468 Zomba on 2008 Feb 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 123 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -27 34 25 .. .. .. 124 0 0 -27 37 9 8 28 54 1 58 27 -27 31 40 -27 42 39 -27 1 11 -28 13 11 125 0 0 -27 3 30 8 28 54 2 57 26 -26 57 59 -27 9 0 -26 27 24 -27 39 39 126 0 0 -26 29 16 8 28 53 3 57 25 -26 23 45 -26 34 48 -25 53 4 -27 5 33 127 0 0 -25 54 30 8 28 52 4 57 24 -25 48 58 -26 0 3 -25 18 10 -26 30 53 128 0 0 -25 19 11 8 28 51 5 56 23 -25 13 38 -25 24 45 -24 42 45 -25 55 42 129 0 0 -24 43 21 8 28 49 6 56 22 -24 37 46 -24 48 55 -24 6 48 -25 19 58 130 0 0 -24 6 59 8 28 48 7 55 21 -24 1 24 -24 12 35 -23 30 20 -24 43 43 131 0 0 -23 30 7 8 28 46 8 55 20 -23 24 31 -23 35 44 -22 53 22 -24 6 57 132 0 0 -22 52 46 8 28 43 9 55 19 -22 47 8 -22 58 23 -22 15 54 -23 29 41 133 0 0 -22 14 55 8 28 41 11 54 18 -22 9 17 -22 20 34 -21 37 58 -22 51 57 134 0 0 -21 36 38 8 28 38 12 54 17 -21 30 59 -21 42 17 -20 59 35 -22 13 44 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16 2 8 3 37 12 295 -44 21 21 7 21 10 58 21 49 20 20 42 41 - 68 0 0 20 51 1 8 3 34 11 296 -43 20 56 7 20 45 55 21 24 26 20 17 31 - 67 0 0 20 25 20 8 3 32 10 296 -42 20 30 27 20 20 12 20 58 54 19 51 42 - 66 0 0 19 58 59 8 3 30 9 296 -41 20 4 8 19 53 51 20 32 41 19 25 14 - 65 0 0 19 32 0 8 3 28 8 297 -40 19 37 9 19 26 50 20 5 50 18 58 6 - 64 0 0 19 4 20 8 3 26 6 297 -39 19 9 31 18 59 9 19 38 19 18 30 18 - 63 0 0 18 36 1 8 3 25 5 297 -38 18 41 14 18 30 49 19 10 9 18 1 50 - 62 0 0 18 7 2 8 3 23 4 298 -37 18 12 16 18 1 49 18 41 18 17 32 43 - 61 0 0 17 37 24 8 3 22 3 298 -36 17 42 39 17 32 9 18 11 48 17 2 55 - 60 0 0 17 7 5 8 3 22 2 298 -35 17 12 21 17 1 49 17 41 39 16 32 28 - 59 0 0 16 36 7 8 3 21 1 299 -34 16 41 24 16 30 49 17 10 49 16 1 20 - 58 0 0 16 4 28 8 3 21 0 299 -33 16 9 47 .. .. .. .. .. .. .. .. .. Data for the target star ------------------------ * name: TYC 1888-01256-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 35 53.7825 DE: +27 40 40.933 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .023 ) * V mag [mag]: 9.3 * B mag [mag]: 10.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1468) Zomba approx. diameter [km]: 17 approx. diameter ["]: .014 distance from Earth [AU]: 1.71300 * orbital information: orbit source: Preston date of fit: 2008 Jan 30 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 718 number of rejected observations: 20 time covered by the observations: 1938 Jul 23 - 2007 Nov 07 1 sigma uncertainty ellipse (major, minor, PA): 0.042, 0.025, 103° remarks: * orbital elements for (1468) Zomba : Mean anomaly = 115.91593700 deg Arg. of pericenter = 22.84328321 deg Long. of node = 309.00132925 deg Inclination = 9.94685465 deg Eccentricity = 0.27066878 Semimajor axis = 2.19604414 AU Perihelion dist = 1.60164355 AU Mag: H = 12.54, G = 0.15 Epoch of elements : MJD 54501.34500000 TDT (2008 Feb 05.345) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Feb 05 1468 Zomba 8h 16.1m UT 9.3 6 35 53.783 27 40 40.93TYC 1888-01256-1 10.3 17.6 17 2.1 1.713 -1.630 -10.11 -159.926 27.681 59.46 -16.07 8.2689 .05036 -.10937 -4.22371 -1.96984 0.00356 -0.00058 2000 115.5085892008 2 4.00000 22.843283309.001329 9.9468550.270668782.196044141.6016435513.65 0.15 RATE 3.0286040 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.049 0.034 99.4 3.780 0.038 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 30, 22:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org