IOTA/IOTA-ES occultation update for (411) Xanthe / HIP 43103 event on 2007 Apr 18, 00:55 UT Visible from SE USA Summary ------- On 2007 Apr 18 UT, the 76 km diameter asteroid (411) Xanthe will occult a 4.2 mag star in the constellation Cancer for observers along a path across SE USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 10.5 mag to 14.7 mag (the magnitude of the asteroid) for at most 8.3 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Ron Stone, 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: . The event at a glimpse ---------------------- * Rank: 79 * date and approx. time of event: 2007 Apr 18, 00:43 - 2007 Apr 18, 01:07 UT * magnitude of target star: 4.2 * magnitude drop [mag]: 10.5 * estimated maximum duration [s]: 8.3 * Moon: 1 % sunlit, 89° distance * Sun: 99° distance * rough path description: SE USA Additional comments ------------------- 30" double star The occultation path -------------------- * approximate projected width [km]: 76 * 1 sigma uncertainty interval [path widths]: +/- 0.70 * 1 sigma uncertainty interval [seconds]: +/- 5.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .024", 89° ) * approx speed of asteroid's shadow [km/s]: 9.2036 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 43103 by 411 Xanthe on 2007 Apr 18 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 172 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 22 56 25 173 0 0 22 32 8 0 43 59 1 59 77 22 8 2 22 56 14 21 34 20 23 30 0 174 0 0 23 5 22 0 43 59 2 59 77 22 41 21 23 29 24 22 7 45 24 3 3 175 0 0 23 38 4 0 44 0 3 60 76 23 14 8 24 2 1 22 40 39 24 35 34 176 0 0 24 10 12 0 44 0 4 60 75 23 46 21 24 34 4 23 12 59 25 7 31 177 0 0 24 41 48 0 44 2 5 61 74 24 18 2 25 5 35 23 44 46 25 38 54 178 0 0 25 12 49 0 44 3 6 61 73 24 49 8 25 36 31 24 16 0 26 9 43 179 0 0 25 43 17 0 44 4 7 62 72 25 19 40 26 6 54 24 46 39 26 39 59 180 0 0 26 13 9 0 44 6 8 62 71 25 49 38 26 36 41 25 16 44 27 9 39 -179 0 0 26 42 27 0 44 8 9 62 70 26 19 2 27 5 54 25 46 14 27 38 45 -178 0 0 27 11 11 0 44 10 10 63 69 26 47 50 27 34 32 26 15 10 28 7 16 -177 0 0 27 39 18 0 44 12 11 63 68 27 16 3 28 2 35 26 43 30 28 35 11 -176 0 0 28 6 51 0 44 15 12 64 67 27 43 40 28 30 2 27 11 15 29 2 31 -175 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50 44 303 -55 7 23 38 8 15 17 6 47 32 8 51 28 - 45 0 0 7 4 37 1 4 1 42 303 -56 6 38 48 7 30 28 6 2 40 8 6 40 - 44 0 0 6 19 40 1 4 11 41 303 -58 5 53 50 6 45 31 5 17 41 7 21 45 - 43 0 0 5 34 37 1 4 21 40 303 -59 5 8 46 6 0 28 4 32 37 6 36 42 - 42 0 0 4 49 29 1 4 31 39 303 -60 4 23 39 5 15 21 3 47 30 5 51 35 - 41 0 0 4 4 20 1 4 41 37 304 -61 3 38 29 4 30 11 3 2 21 5 6 25 - 40 0 0 3 19 10 1 4 50 36 304 -63 2 53 20 3 45 1 2 17 13 4 21 14 - 39 0 0 2 34 2 1 4 59 35 304 -64 2 8 14 2 59 52 1 32 7 3 36 4 - 38 0 0 1 48 58 1 5 7 33 304 -65 1 23 11 2 14 47 0 47 6 2 50 57 - 37 0 0 1 4 0 1 5 16 32 304 -66 0 38 14 1 29 47 0 2 11 2 5 55 - 36 0 0 0 19 8 1 5 24 31 304 -68 - 0 6 36 0 44 54 - 0 42 36 1 21 0 - 35 0 0 - 0 25 33 1 5 32 30 304 -69 - 0 51 16 0 0 10 - 1 27 13 0 36 13 - 34 0 0 - 1 10 4 1 5 39 28 304 -70 - 1 35 44 - 0 44 23 - 2 11 38 - 0 8 24 - 33 0 0 - 1 54 22 1 5 46 27 304 -71 - 2 20 0 - 1 28 44 - 2 55 50 - 0 52 48 - 32 0 0 - 2 38 26 1 5 53 26 304 -73 - 3 4 1 - 2 12 50 - 3 39 47 - 1 36 58 - 31 0 0 - 3 22 14 1 5 59 25 304 -74 - 3 47 45 - 2 56 41 - 4 23 27 - 2 20 53 - 30 0 0 - 4 5 43 1 6 6 23 304 -75 - 4 31 12 - 3 40 14 - 5 6 49 - 3 4 31 - 29 0 0 - 4 48 54 1 6 11 22 304 -76 - 5 14 19 - 4 23 28 - 5 49 52 - 3 47 50 - 28 0 0 - 5 31 44 1 6 17 21 304 -78 - 5 57 5 - 5 6 22 - 6 32 33 - 4 30 49 - 27 0 0 - 6 14 12 1 6 22 20 304 -79 - 6 39 29 - 5 48 53 - 7 14 51 - 5 13 26 - 26 0 0 - 6 56 16 1 6 27 18 303 -80 - 7 21 29 - 6 31 2 - 7 56 45 - 5 55 40 - 25 0 0 - 7 37 56 1 6 31 17 303 -81 - 8 3 4 - 7 12 46 - 8 38 15 - 6 37 30 - 24 0 0 - 8 19 9 1 6 36 16 303 -82 - 8 44 14 - 7 54 4 - 9 19 18 - 7 18 54 - 23 0 0 - 8 59 56 1 6 40 15 303 -84 - 9 24 56 - 8 34 55 - 9 59 54 - 7 59 52 - 22 0 0 - 9 40 14 1 6 43 14 303 -85 -10 5 9 - 9 15 18 -10 40 1 - 8 40 22 - 21 0 0 -10 20 4 1 6 46 12 303 -86 -10 44 54 - 9 55 13 -11 19 38 - 9 20 23 - 20 0 0 -10 59 23 1 6 49 11 302 -87 -11 24 8 -10 34 37 -11 58 46 - 9 59 54 - 19 0 0 -11 38 11 1 6 52 10 302 -87 -12 2 51 -11 13 30 -12 37 22 -10 38 55 - 18 0 0 -12 16 28 1 6 54 9 302 -88 -12 41 3 -11 51 52 -13 15 26 -11 17 24 - 17 0 0 -12 54 12 1 6 56 8 302 -88 -13 18 41 -12 29 41 -13 52 57 -11 55 20 - 16 0 0 -13 31 23 1 6 58 6 302 -87 -13 55 47 -13 6 57 -14 29 56 -12 32 44 - 15 0 0 -14 8 0 1 6 59 5 301 -86 -14 32 19 -13 43 40 -15 6 20 -13 9 34 - 14 0 0 -14 44 2 1 7 0 4 301 -85 -15 8 16 -14 19 48 -15 42 9 -13 45 50 - 13 0 0 -15 19 30 1 7 1 3 301 -84 -15 43 38 -14 55 21 -16 17 24 -14 21 30 - 12 0 0 -15 54 22 1 7 2 2 301 -83 -16 18 25 -15 30 19 -16 52 3 -14 56 36 - 11 0 0 -16 28 39 1 7 2 1 300 -82 -16 52 36 -16 4 41 -17 26 7 -15 31 6 - 10 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -16 5 0 Data for the target star ------------------------ * name: HIP 43103 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 46 41.8083 DE: +28 45 35.316 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .026, .021 ) * V mag [mag]: 4.2 * B mag [mag]: 5.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (411) Xanthe approx. diameter [km]: 76 approx. diameter ["]: .036 distance from Earth [AU]: 2.89000 * orbital information: orbit source: Preston date of fit: 2007 Apr 06 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 738 number of rejected observations: 39 time covered by the observations: 1902 Apr 28 - 2007 Mar 20 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.012, 86° remarks: * orbital elements for (411) Xanthe : Mean anomaly = 222.76171045 deg Arg. of pericenter = 183.49741098 deg Long. of node = 107.54747112 deg Inclination = 15.35665030 deg Eccentricity = 0.11609915 Semimajor axis = 2.93361555 AU Perihelion dist = 2.59302528 AU Mag: H = 9.24, G = 0.15 Epoch of elements : MJD 54208.03800000 TDT (2007 Apr 18.038) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Apr 18 411 Xanthe 0h 55.5m UT 4.2 8 46 41.808 28 45 35.32HIP 43103 5.0 14.7 76 8.3 2.890 1.113 -5.99 -87.973 28.762 -193.99 10.63 0.9251 .01965 .04884 4.80814 -1.96661 0.00551 -0.00171 2000 221.1850162007 410.00000183.497411107.547471 15.3566500.116099152.933615552.593025288.9 5 0.15 RATE 1.9615490 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.030 0.024 89.0 1.700 0.025 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Apr 06, 20:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org