IOTA/IOTA-ES occultation update for (1607) Mavis / HIP 554 event on 2007 Sep 01, 17:23 UT Visible from Japan, Indonesia, Australia Summary ------- On 2007 Sep 01 UT, the 12 km diameter asteroid (1607) Mavis will occult a 9.8 mag star in the constellation Cetus for observers along a path across Japan, Indonesia, Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 13.1 mag (the magnitude of the asteroid) for at most 2.4 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: 29 * date and approx. time of event: 2007 Sep 01, 17:02 - 2007 Sep 01, 17:45 UT * magnitude of target star: 9.8 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 2.4 * Moon: 76 % sunlit, 45° distance * Sun: 158° distance * rough path description: Japan, Indonesia, Australia The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 2.34 * 1 sigma uncertainty interval [seconds]: +/- 5.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .051 +/- .043) * 1 sigma uncertainty ellipse (major, minor, PA): ( .052", .042", 72° ) * approx speed of asteroid's shadow [km/s]: 4.9379 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 554 by 1607 Mavis on 2007 Sep 01 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 ' " Longitude Longitude Longitude Longitude ... .. .. 70 0 0 .. .. .. .. .. .. ... .. .. ... .. .. 173 29 43 ... .. .. 171 50 51 69 0 0 17 2 50 1 225 0 171 38 14 172 3 31 170 39 41 173 3 22 169 16 2 68 0 0 17 2 51 3 222 -1 169 4 24 169 27 41 168 10 26 170 22 40 Latitude Latitude Latitude Latitude 168 0 0 67 27 37 17 2 52 3 221 -2 67 32 32 67 22 42 67 55 31 66 59 43 167 0 0 67 0 34 17 2 53 4 220 -3 67 5 34 66 55 34 67 28 59 66 32 10 166 0 0 66 32 7 17 2 54 5 219 -3 66 37 13 66 27 1 67 1 4 66 3 10 165 0 0 66 2 10 17 2 55 5 218 -4 66 7 22 65 56 58 66 31 41 65 32 40 164 0 0 65 30 38 17 2 56 6 217 -4 65 35 56 65 25 20 66 0 44 65 0 32 163 0 0 64 57 24 17 2 58 7 217 -5 65 2 48 64 52 0 65 28 7 64 26 42 162 0 0 64 22 22 17 3 0 7 216 -6 64 27 54 64 16 51 64 53 44 63 51 2 161 0 0 63 45 25 17 3 2 8 215 -6 63 51 4 63 39 47 64 17 27 63 13 25 160 0 0 63 6 26 17 3 5 9 214 -7 63 12 11 63 0 40 63 39 9 62 33 44 159 0 0 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58 22 -72 5 55 -71 40 41 -72 23 35 - 5 0 0 -71 50 36 17 45 42 4 122 -5 -71 46 47 -71 54 25 -71 28 56 -72 12 17 - 6 0 0 -71 38 31 17 45 43 4 123 -5 -71 34 40 -71 42 22 -71 16 36 -72 0 25 - 7 0 0 -71 25 50 17 45 43 3 124 -4 -71 21 56 -71 29 44 -71 3 41 -71 47 59 - 8 0 0 -71 12 33 17 45 44 3 125 -4 -71 8 37 -71 16 30 -70 50 9 -71 34 58 - 9 0 0 -70 58 38 17 45 44 3 126 -4 -70 54 38 -71 2 37 -70 35 57 -71 21 19 - 10 0 0 -70 44 2 17 45 44 2 127 -3 -70 40 0 -70 48 5 -70 21 5 -71 7 0 - 11 0 0 -70 28 45 17 45 45 2 128 -3 -70 24 39 -70 32 50 -70 5 29 -70 52 0 - 12 0 0 -70 12 43 17 45 45 1 129 -3 -70 8 34 -70 16 52 -69 49 9 -70 36 17 - 13 0 0 -69 55 55 17 45 45 1 130 -2 -69 51 42 -70 0 7 -69 32 1 -70 19 48 - 14 0 0 -69 38 17 17 45 45 0 131 -2 -69 34 1 -69 42 33 -69 14 4 -70 2 31 - 15 0 0 -69 19 49 17 45 46 0 132 -1 .. .. .. -69 24 8 .. .. .. -69 44 23 Data for the target star ------------------------ * name: HIP 554 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 06 46.2430 DE: -13 44 56.612 * position source: mpos:UCAC2 pm:UCAC2 plx:HIP * standard error: RA,DE ["]: ( .018, .023 ) * V mag [mag]: 9.8 * B mag [mag]: 10.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1607) Mavis approx. diameter [km]: 12 approx. diameter ["]: .021 distance from Earth [AU]: 0.80600 * orbital information: orbit source: Preston date of fit: 2007 Aug 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 773 number of rejected observations: 26 time covered by the observations: 1903 Jan 22 - 2007 Aug 27 1 sigma uncertainty ellipse (major, minor, PA): 0.049, 0.035, 70° remarks: * orbital elements for (1607) Mavis : Mean anomaly = 353.89549245 deg Arg. of pericenter = 236.00926203 deg Long. of node = 122.59352857 deg Inclination = 8.57810470 deg Eccentricity = 0.30442369 Semimajor axis = 2.55039181 AU Perihelion dist = 1.77399212 AU Mag: H = 11.32, G = 0.15 Epoch of elements : MJD 54344.72500000 TDT (2007 Sep 01.725) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Sep 01 1607 Mavis 17h 24.3m UT 9.8 0 6 46.243-13 44 56.61HIP 554 10.5 13.1 12 2.4 0.806 -0.558 -29.33 -239.876 -13.741 -81.06 8.23 17.4049 -.00585 .00165 -0.74277 -2.68628 -0.00176 0.00037 2000 352.7520982007 828.00000236.009262122.593529 8.5781050.304423692.550391811.7739921211.65 0.15 RATE 2.4198800 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.052 0.042 72.4 3.340 0.048 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Aug 28, 23:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org