IOTA/IOTA-ES occultation update for (615) Roswitha / TYC 5537-00987-1 event on 2007 Jul 01, 21:02 UT Visible from Africa Summary ------- On 2007 Jul 01 UT, the 48 km diameter asteroid (615) Roswitha will occult a 11.4 mag star in the constellation Virgo for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 14.8 mag (the magnitude of the asteroid) for at most 4.0 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, 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: UCAC. The event at a glimpse ---------------------- * Rank: 51 * date and approx. time of event: 2007 Jul 01, 20:55 - 2007 Jul 01, 21:08 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 4.0 * Moon: 98 % sunlit, 93° distance * Sun: 102° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 64 * 1 sigma uncertainty interval [path widths]: +/- 1.26 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .045) * 1 sigma uncertainty ellipse (major, minor, PA): ( .045", .028", 2° ) * approx speed of asteroid's shadow [km/s]: 11.8575 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5537-00987-1 by 615 Roswitha on 2007 Jul 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 ' " Latitude Latitude Latitude Latitude -104 0 0 .. .. .. .. .. .. .. .. .. 63 5 49 .. .. .. .. .. .. .. .. .. -103 0 0 63 13 10 20 55 28 0 113 45 62 54 21 63 32 4 .. .. .. 64 20 12 -102 0 0 63 1 26 20 55 28 1 114 45 62 42 33 63 20 24 .. .. .. 64 8 42 -101 0 0 62 49 22 20 55 28 1 115 45 62 30 25 63 8 24 .. .. .. 63 56 52 -100 0 0 62 36 57 20 55 28 2 116 45 62 17 57 62 56 4 .. .. .. 63 44 41 - 99 0 0 62 24 12 20 55 29 2 117 44 62 5 9 62 43 23 .. .. .. 63 32 11 - 98 0 0 62 11 7 20 55 29 3 118 44 61 51 59 62 30 21 .. .. .. 63 19 19 - 97 0 0 61 57 40 20 55 29 4 119 44 61 38 28 62 16 58 .. .. .. 63 6 6 - 96 0 0 61 43 52 20 55 30 4 120 44 61 24 36 62 3 14 .. .. .. 62 52 33 - 95 0 0 61 29 42 20 55 30 5 121 44 61 10 22 61 49 8 .. .. .. 62 38 37 - 94 0 0 61 15 10 20 55 31 5 121 43 60 55 47 61 34 41 60 7 23 62 24 20 - 93 0 0 61 0 17 20 55 31 6 122 43 60 40 49 61 19 51 59 52 16 62 9 41 - 92 0 0 60 45 1 20 55 32 6 123 43 60 25 30 61 4 39 59 36 47 61 54 40 - 91 0 0 60 29 23 20 55 33 7 124 43 60 9 47 60 49 5 59 20 55 61 39 17 - 90 0 0 60 13 22 20 55 34 7 125 42 59 53 42 60 33 8 59 4 40 61 23 30 - 89 0 0 59 56 58 20 55 35 8 126 42 59 37 15 60 16 49 58 48 2 61 7 21 - 88 0 0 59 40 11 20 55 36 8 127 42 59 20 24 60 0 6 58 31 2 60 50 49 - 87 0 0 59 23 1 20 55 37 9 128 42 59 3 10 59 43 0 58 13 38 60 33 53 - 86 0 0 59 5 28 20 55 38 10 128 41 58 45 32 59 25 30 57 55 51 60 16 34 - 85 0 0 58 47 30 20 55 39 10 129 41 58 27 31 59 7 37 57 37 40 59 58 51 - 84 0 0 58 29 10 20 55 41 11 130 41 58 9 6 58 49 20 57 19 6 59 40 44 - 83 0 0 58 10 25 20 55 42 11 131 40 57 50 18 58 30 39 57 0 8 59 22 13 - 82 0 0 57 51 16 20 55 44 12 132 40 57 31 5 58 11 34 56 40 47 59 3 19 - 81 0 0 57 31 43 20 55 45 13 133 39 57 11 29 57 52 5 56 21 1 58 43 59 - 80 0 0 57 11 46 20 55 47 13 134 39 56 51 28 57 32 12 56 0 51 58 24 16 - 79 0 0 56 51 25 20 55 49 14 135 39 56 31 3 57 11 54 55 40 18 58 4 7 - 78 0 0 56 30 39 20 55 51 15 135 38 56 10 14 56 51 12 55 19 20 57 43 35 - 77 0 0 56 9 30 20 55 53 15 136 38 55 49 1 56 30 6 54 57 59 57 22 38 - 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2007 Jun 08 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.013, 116° remarks: * orbital elements for (615) Roswitha : Mean anomaly = 332.03864415 deg Arg. of pericenter = 247.16196444 deg Long. of node = 13.67221397 deg Inclination = 2.76251158 deg Eccentricity = 0.11241200 Semimajor axis = 2.63127103 AU Perihelion dist = 2.33548459 AU Mag: H = 10.16, G = 0.15 Epoch of elements : MJD 54282.87700000 TDT (2007 Jul 01.877) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Jul 01 615 Roswitha 21h 2.1m UT 11.4 13 15 39.710- 9 56 28.91TYC 5537-00987-1 12.4 14.8 48 4.0 1.954 1.876 -11.79 -36.146 -9.937 -134.56 23.09 21.0351 .26093 .61443 6.15914 -2.61859 0.00486 -0.00194 2000 331.3742962007 629.00000247.161964 13.672214 2.7625120.112412002.631271032.3354845910.35 0.15 RATE 2.3091690 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.045 0.028 2.1 2.260 0.043 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jun 29, 01:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org