IOTA/IOTA-ES occultation update for (2090) Mizuho / HIP 510 event on 2007 Oct 02, 06:00 UT Visible from Brazil, Argentina, Chile Summary ------- On 2007 Oct 02 UT, the 41 km diameter asteroid (2090) Mizuho will occult a 7.8 mag star in the constellation Pisces for observers along a path across Brazil, Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.9 mag to 14.7 mag (the magnitude of the asteroid) for at most 3.5 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: . The event at a glimpse ---------------------- * Rank: 36 * date and approx. time of event: 2007 Oct 02, 05:52 - 2007 Oct 02, 06:07 UT * magnitude of target star: 7.8 * magnitude drop [mag]: 6.9 * estimated maximum duration [s]: 3.5 * Moon: 63 % sunlit, 77° distance * Sun: 171° distance * rough path description: Brazil, Argentina, Chile Additional comments ------------------- close double star. The occultation path -------------------- * approximate projected width [km]: 51 * 1 sigma uncertainty interval [path widths]: +/- 1.83 * 1 sigma uncertainty interval [seconds]: +/- 8.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .071 +/- .062) * 1 sigma uncertainty ellipse (major, minor, PA): ( .077", .054", 57° ) * approx speed of asteroid's shadow [km/s]: 11.7060 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 510 by 2090 Mizuho on 2007 Oct 02 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 179 0 0 -44 24 50 6 7 28 0 76 0 -44 10 35 -44 39 8 .. .. .. .. .. .. 180 0 0 -44 14 14 6 7 28 1 76 -1 -43 59 58 -44 28 33 .. .. .. -45 21 19 -179 0 0 -44 3 30 6 7 28 2 75 -2 -43 49 13 -44 17 49 .. .. .. -45 10 37 -178 0 0 -43 52 37 6 7 27 2 74 -2 -43 38 20 -44 6 56 .. .. .. -44 59 47 -177 0 0 -43 41 35 6 7 27 3 73 -3 -43 27 18 -43 55 56 .. .. .. -44 48 48 -176 0 0 -43 30 26 6 7 26 4 73 -4 -43 16 8 -43 44 47 .. .. .. -44 37 41 -175 0 0 -43 19 8 6 7 26 5 72 -5 -43 4 50 -43 33 29 .. .. .. -44 26 26 -174 0 0 -43 7 43 6 7 25 5 71 -5 -42 53 24 -43 22 4 .. .. .. -44 15 3 -173 0 0 -42 56 9 6 7 24 6 71 -6 -42 41 50 -43 10 32 -41 49 47 -44 3 32 -172 0 0 -42 44 29 6 7 23 7 70 -7 -42 30 9 -42 58 51 -41 38 4 -43 51 53 -171 0 0 -42 32 40 6 7 22 8 69 -8 -42 18 20 -42 47 4 -41 26 14 -43 40 7 -170 0 0 -42 20 45 6 7 21 8 69 -8 -42 6 24 -42 35 9 -41 14 16 -43 28 14 -169 0 0 -42 8 43 6 7 19 9 68 -9 -41 54 21 -42 23 7 -41 2 12 -43 16 14 -168 0 0 -41 56 34 6 7 18 10 67 -10 -41 42 12 -42 10 58 -40 50 1 -43 4 6 -167 0 0 -41 44 18 6 7 16 11 67 -11 -41 29 56 -41 58 43 -40 37 44 -42 51 52 -166 0 0 -41 31 56 6 7 15 11 66 -11 -41 17 33 -41 46 21 -40 25 20 -42 39 32 -165 0 0 -41 19 27 6 7 13 12 65 -12 -41 5 5 -41 33 53 -40 12 50 -42 27 5 -164 0 0 -41 6 53 6 7 11 13 65 -13 -40 52 30 -41 21 19 -40 0 14 -42 14 32 -163 0 0 -40 54 13 6 7 9 14 64 -14 -40 39 50 -41 8 39 -39 47 33 -42 1 54 -162 0 0 -40 41 27 6 7 6 14 63 -14 -40 27 4 -40 55 54 -39 34 46 -41 49 9 -161 0 0 -40 28 36 6 7 4 15 63 -15 -40 14 13 -40 43 3 -39 21 54 -41 36 20 -160 0 0 -40 15 40 6 7 1 16 62 -16 -40 1 16 -40 30 7 -39 8 57 -41 23 25 -159 0 0 -40 2 40 6 6 59 17 61 -17 -39 48 15 -40 17 7 -38 55 55 -41 10 25 -158 0 0 -39 49 34 6 6 56 18 60 -18 -39 35 10 -40 4 1 -38 42 49 -40 57 20 -157 0 0 -39 36 24 6 6 53 18 60 -18 -39 22 0 -39 50 52 -38 29 38 -40 44 11 -156 0 0 -39 23 10 6 6 50 19 59 -19 -39 8 45 -39 37 38 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15 18 -24 56 16 -27 7 8 - 22 0 0 -26 9 33 5 53 1 9 285 -17 -25 55 32 -26 23 38 -25 4 33 -27 15 30 - 21 0 0 -26 18 5 5 52 59 8 285 -16 -26 4 3 -26 32 10 -25 13 2 -27 24 5 - 20 0 0 -26 26 51 5 52 58 7 285 -15 -26 12 48 -26 40 56 -25 21 44 -27 32 53 - 19 0 0 -26 35 49 5 52 57 6 284 -15 -26 21 45 -26 49 55 .. .. .. -27 41 54 - 18 0 0 -26 44 59 5 52 56 5 284 -14 -26 30 55 -26 59 6 .. .. .. -27 51 8 - 17 0 0 -26 54 23 5 52 55 4 283 -13 -26 40 18 -27 8 30 .. .. .. -28 0 35 - 16 0 0 -27 3 58 5 52 54 3 283 -12 -26 49 53 -27 18 6 .. .. .. -28 10 13 - 15 0 0 -27 13 46 5 52 54 2 282 -11 -26 59 40 -27 27 55 .. .. .. -28 20 4 - 14 0 0 -27 23 46 5 52 53 2 282 -10 -27 9 39 -27 37 55 .. .. .. -28 30 7 - 13 0 0 -27 33 58 5 52 53 1 281 -9 -27 19 50 -27 48 8 .. .. .. -28 40 22 Data for the target star ------------------------ * name: HIP 510 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 06 08.0458 DE: +09 42 53.695 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .015, .010 ) * V mag [mag]: 7.8 * B mag [mag]: 8.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2090) Mizuho approx. diameter [km]: 41 approx. diameter ["]: .032 distance from Earth [AU]: 1.77800 * orbital information: orbit source: Preston date of fit: 2007 Sep 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 553 number of rejected observations: 30 time covered by the observations: 1951 Mar 13 - 2007 Sep 24 1 sigma uncertainty ellipse (major, minor, PA): 0.076, 0.053, 56° remarks: * orbital elements for (2090) Mizuho : Mean anomaly = 38.37490906 deg Arg. of pericenter = 337.55130498 deg Long. of node = 340.04788880 deg Inclination = 11.79931043 deg Eccentricity = 0.13511629 Semimajor axis = 3.07131560 AU Perihelion dist = 2.65633084 AU Mag: H = 10.53, G = 0.15 Epoch of elements : MJD 54375.25000000 TDT (2007 Oct 02.250) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 02 2090 Mizuho 6h 0.2m UT 7.8 0 6 8.046 9 42 53.70HIP 510 8.3 14.7 41 3.5 1.778 -2.185 -4.85 -99.093 9.715 87.34 -3.44 6.0030 .08827 -.58783 -6.53403 -0.98056 0.00060 -0.00064 2000 37.41356962007 927.00000337.551305340.047889 11.7993100.135116293.071315602.6563308410.95 0.15 RATE 1.8311226 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.077 0.054 57.2 2.830 0.058 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 25, 22:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org