IOTA/IOTA-ES occultation update for (5296) Friedrich / HIP 65570 event on 2008 Apr 01, 20:47 UT Visible from Antarctica Summary ------- On 2008 Apr 01 UT, the 15 km diameter asteroid (5296) Friedrich will occult a 9.5 mag star in the constellation Virgo for observers along a path across Antarctica. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.2 mag to 15.7 mag (the magnitude of the asteroid) for at most 1.4 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: . The event at a glimpse ---------------------- * Rank: 15 * date and approx. time of event: 2008 Apr 01, 20:40 - 2008 Apr 01, 20:53 UT * midpoint of event [JD]: 2454558.366075 * magnitude of target star: 9.5 * magnitude drop [mag]: 6.2 * estimated maximum duration [s]: 1.4 * Moon: 22 % sunlit, 115° distance * Sun: 170° distance * rough path description: Antarctica The occultation path -------------------- * approximate projected width [km]: 22 * 1 sigma uncertainty interval [path widths]: +/- 4.57 * 1 sigma uncertainty interval [seconds]: +/- 13.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .102 +/- .061) * 1 sigma uncertainty ellipse (major, minor, PA): ( .107", .050", 111° ) * approx speed of asteroid's shadow [km/s]: 10.9033 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 65570 by 5296 Friedrich on 2008 Apr 1 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 - 34 0 0 -24 13 16 20 53 47 0 95 -10 -24 7 17 -24 19 16 .. .. .. -25 14 35 - 33 0 0 -24 18 27 20 53 47 1 94 -11 -24 12 27 -24 24 27 .. .. .. -25 19 48 - 32 0 0 -24 24 10 20 53 47 2 94 -12 -24 18 11 -24 30 10 .. .. .. -25 25 35 - 31 0 0 -24 30 26 20 53 46 3 94 -13 -24 24 27 -24 36 27 .. .. .. -25 31 54 - 30 0 0 -24 37 15 20 53 45 4 93 -13 -24 31 15 -24 43 16 .. .. .. -25 38 47 - 29 0 0 -24 44 37 20 53 44 5 93 -14 -24 38 36 -24 50 38 .. .. .. -25 46 12 - 28 0 0 -24 52 30 20 53 43 6 92 -15 -24 46 29 -24 58 32 .. .. .. -25 54 10 - 27 0 0 -25 0 56 20 53 41 7 92 -16 -24 54 55 -25 6 58 .. .. .. -26 2 40 - 26 0 0 -25 9 54 20 53 40 8 91 -17 -25 3 52 -25 15 56 -24 9 15 -26 11 43 - 25 0 0 -25 19 23 20 53 38 8 91 -18 -25 13 21 -25 25 26 -24 18 39 -26 21 18 - 24 0 0 -25 29 24 20 53 36 9 91 -19 -25 23 21 -25 35 27 -24 28 35 -26 31 24 - 23 0 0 -25 39 56 20 53 33 10 90 -20 -25 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-70 33 41 -70 45 36 -69 39 47 -71 40 38 138 0 0 -70 40 15 20 40 42 9 281 -6 -70 34 18 -70 46 13 -69 40 25 -71 41 13 139 0 0 -70 40 40 20 40 42 8 280 -5 -70 34 43 -70 46 37 -69 40 51 -71 41 37 140 0 0 -70 40 52 20 40 41 8 279 -5 -70 34 56 -70 46 50 -69 41 5 -71 41 49 141 0 0 -70 40 53 20 40 40 8 278 -5 -70 34 56 -70 46 50 -69 41 5 -71 41 49 142 0 0 -70 40 41 20 40 40 7 277 -4 -70 34 44 -70 46 39 -69 40 54 -71 41 37 143 0 0 -70 40 17 20 40 39 7 276 -4 -70 34 21 -70 46 15 -69 40 30 -71 41 14 144 0 0 -70 39 42 20 40 38 7 275 -4 -70 33 45 -70 45 39 -69 39 53 -71 40 39 145 0 0 -70 38 54 20 40 38 6 274 -3 -70 32 57 -70 44 51 -69 39 4 -71 39 52 146 0 0 -70 37 53 20 40 37 6 273 -3 -70 31 56 -70 43 51 -69 38 3 -71 38 53 147 0 0 -70 36 41 20 40 37 6 272 -3 -70 30 44 -70 42 39 -69 36 48 -71 37 43 148 0 0 -70 35 16 20 40 36 5 271 -2 -70 29 19 -70 41 15 .. .. .. -71 36 20 149 0 0 -70 33 39 20 40 36 5 270 -2 -70 27 42 -70 39 38 .. .. .. -71 34 46 150 0 0 -70 31 50 20 40 36 5 269 -2 -70 25 52 -70 37 49 .. .. .. -71 33 0 151 0 0 -70 29 48 20 40 35 4 269 -1 -70 23 50 -70 35 48 .. .. .. -71 31 2 152 0 0 -70 27 34 20 40 35 4 268 -1 -70 21 36 -70 33 34 .. .. .. -71 28 51 153 0 0 -70 25 8 20 40 34 4 267 -1 -70 19 8 -70 31 7 .. .. .. -71 26 29 154 0 0 -70 22 28 20 40 34 3 266 0 -70 16 29 -70 28 28 .. .. .. -71 23 54 Uncertainty in time = +/- 13 secs [Prediction of 2008 Feb 28.0] Data for the target star ------------------------ * name: HIP 65570 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 13 26 37.9642 DE: -04 26 44.928 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .023, .015 ) * V mag [mag]: 9.5 * B mag [mag]: 10.5 * Apparent position with proper motion RA(deg): 201.7726553978 DE(deg): -4.4924262371 * Equation of equinoxes (radians) : 0.000041501076903 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (5296) Friedrich approx. diameter [km]: 15 approx. diameter ["]: .011 distance from Earth [AU]: 1.85800 * orbital information: orbit source: Preston date of fit: 2008 Feb 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 807 number of rejected observations: 20 time covered by the observations: 1954 Aug 04 - 2008 Jan 20 1 sigma uncertainty ellipse (major, minor, PA): 0.105, 0.048, 112° remarks: * orbital elements for (5296) Friedrich : Mean anomaly = 331.76900254 deg Arg. of pericenter = 132.55360869 deg Long. of node = 100.50401348 deg Inclination = 2.84080210 deg Eccentricity = 0.10485968 Semimajor axis = 3.12661533 AU Perihelion dist = 2.79875944 AU Mag: H = 12.10, G = 0.15 Epoch of elements : MJD 54557.86600000 TDT (2008 Apr 01.866) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Apr 1 5296 Friedrich 20h 47.2m UT 9.5 13 26 37.964- 4 26 44.93HIP 65570 10.5 15.7 15 1.4 1.858 -1.795 11.35 59.2913 -4.450 -130.87 4.94 20.7858 -0.28500 -0.67395 -5.66778 2.39789 -0.00105 -0.00004 2000 330.3666862008 325.00000132.553609100.504013 2.8408020.10485968 3.1266153 2.798759411.7 5.00.15 RATE 1.7827580 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.107 0.050 111 5.57 0.051 0 54524.5020080401__65570 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 07, 13:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org