IOTA/IOTA-ES occultation update for (433) Eros / TYC 7424-02237-1 event on 2007 Jul 04, 05:16 UT Visible from Africa, Brazil, Ecuador Summary ------- On 2007 Jul 04 UT, the 15 km diameter asteroid (433) Eros will occult a 10.3 mag star in the constellation Sagittarius for observers along a path across Africa, Brazil, Ecuador. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 12.0 mag (the magnitude of the asteroid) for at most 1.5 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: UCAC. The event at a glimpse ---------------------- * Rank: 70 * date and approx. time of event: 2007 Jul 04, 05:06 - 2007 Jul 04, 05:24 UT * magnitude of target star: 10.3 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 1.5 * Moon: 85 % sunlit, 38° distance * Sun: 169° distance * rough path description: Africa, Brazil, Ecuador The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 0.84 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .028", .023", 80° ) * approx speed of asteroid's shadow [km/s]: 10.1731 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7424-02237-1 by 433 Eros on 2007 Jul 04 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 -136 0 0 34 23 30 5 24 14 1 129 -12 34 29 36 34 17 23 34 39 54 34 7 9 -135 0 0 33 44 3 5 24 13 2 129 -13 33 50 9 33 37 57 34 0 26 33 27 44 -134 0 0 33 4 28 5 24 13 3 130 -14 33 10 33 32 58 22 33 20 49 32 48 10 -133 0 0 32 24 45 5 24 12 4 130 -15 32 30 50 32 18 40 32 41 5 32 8 29 -132 0 0 31 44 57 5 24 11 5 131 -16 31 51 1 31 38 53 32 1 14 31 28 42 -131 0 0 31 5 4 5 24 10 6 131 -17 31 11 8 30 59 1 31 21 20 30 48 52 -130 0 0 30 25 9 5 24 8 7 132 -18 30 31 12 30 19 6 30 41 22 30 8 59 -129 0 0 29 45 12 5 24 6 8 132 -19 29 51 14 29 39 11 30 1 24 29 29 5 -128 0 0 29 5 17 5 24 4 9 133 -21 29 11 18 28 59 16 29 21 25 28 49 12 -127 0 0 28 25 23 5 24 2 10 133 -22 28 31 23 28 19 24 28 41 29 28 9 21 -126 0 0 27 45 33 5 23 59 12 134 -23 27 51 32 27 39 35 28 1 36 27 29 33 -125 0 0 27 5 48 5 23 56 13 134 -24 27 11 46 26 59 51 27 21 49 26 49 51 -124 0 0 26 26 10 5 23 53 14 135 -25 26 32 7 26 20 14 26 42 8 26 10 16 -123 0 0 25 46 40 5 23 50 15 135 -26 25 52 36 25 40 45 26 2 34 25 30 50 -122 0 0 25 7 20 5 23 46 16 136 -27 25 13 14 25 1 26 25 23 11 24 51 32 -121 0 0 24 28 11 5 23 42 17 136 -28 24 34 4 24 22 18 24 43 58 24 12 26 -120 0 0 23 49 14 5 23 38 18 137 -29 23 55 6 23 43 22 24 4 58 23 33 33 -119 0 0 23 10 31 5 23 33 19 137 -30 23 16 21 23 4 40 23 26 11 22 54 53 -118 0 0 22 32 2 5 23 28 20 138 -31 22 37 52 22 26 14 22 47 39 22 16 29 -117 0 0 21 53 51 5 23 23 21 138 -32 21 59 38 21 48 3 22 9 24 21 38 21 -116 0 0 21 15 56 5 23 18 22 139 -34 21 21 43 21 10 10 21 31 26 21 0 30 -115 0 0 20 38 21 5 23 13 23 139 -35 20 44 6 20 32 36 20 53 46 20 22 58 -114 0 0 20 1 5 5 23 7 25 140 -36 20 6 49 19 55 22 20 16 27 19 45 46 -113 0 0 19 24 10 5 23 1 26 140 -37 19 29 52 19 18 29 19 39 28 19 8 55 -112 0 0 18 47 37 5 22 55 27 141 -38 18 53 18 18 41 57 19 2 51 18 32 26 -111 0 0 18 11 28 5 22 49 28 141 -39 18 17 7 18 5 49 18 26 38 17 56 21 -110 0 0 17 35 42 5 22 42 29 141 -40 17 41 20 17 30 4 17 50 48 17 20 39 -109 0 0 17 0 21 5 22 35 30 142 -41 17 5 57 16 54 45 17 15 23 16 45 22 -108 0 0 16 25 26 5 22 28 31 142 -42 16 31 0 16 19 51 16 40 24 16 10 30 -107 0 0 15 50 57 5 22 21 32 143 -43 15 56 30 15 45 24 16 5 51 15 36 5 -106 0 0 15 16 56 5 22 13 33 144 -44 15 22 27 15 11 24 15 31 46 15 2 8 -105 0 0 14 43 22 5 22 6 34 144 -45 14 48 53 14 37 52 14 58 9 14 28 38 -104 0 0 14 10 18 5 21 58 35 145 -46 14 15 47 14 4 49 14 25 0 13 55 38 -103 0 0 13 37 42 5 21 50 36 145 -47 13 43 10 13 32 15 13 52 21 13 23 6 -102 0 0 13 5 37 5 21 42 37 146 -48 13 11 3 13 0 11 13 20 12 12 51 5 -101 0 0 12 34 3 5 21 34 38 146 -49 12 39 27 12 28 38 12 48 34 12 19 34 -100 0 0 12 2 59 5 21 25 39 147 -50 12 8 22 11 57 36 12 17 26 11 48 34 - 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Data for the target star ------------------------ * name: TYC 7424-02237-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 27 07.9868 DE: -30 41 17.317 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .019 ) * V mag [mag]: 10.3 * B mag [mag]: 10.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (433) Eros approx. diameter [km]: 15 approx. diameter ["]: .028 distance from Earth [AU]: 0.74800 * orbital information: orbit source: Preston date of fit: 2007 Jun 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 4658 number of rejected observations: 268 time covered by the observations: 1900 May 28 - 2007 Jun 28 1 sigma uncertainty ellipse (major, minor, PA): 0.019, 0.013, 69° remarks: * orbital elements for (433) Eros : Mean anomaly = 151.70074667 deg Arg. of pericenter = 178.68357373 deg Long. of node = 304.37737849 deg Inclination = 10.82991767 deg Eccentricity = 0.22279691 Semimajor axis = 1.45822099 AU Perihelion dist = 1.13333386 AU Mag: H = 10.74, G = 0.46 Epoch of elements : MJD 54285.22000000 TDT (2007 Jul 04.220) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Jul 04 433 Eros 5h 15.3m UT 10.3 19 27 7.987-30 41 17.32TYC 7424-02237-1 10.5 12.0 15 1.5 0.748 -5.143 12.42 291.124 -30.690 102.26 22.91 5.2544 .09434 .50345 -5.64413 1.05567 -0.00070 0.00060 2000 148.7790202007 629.00000178.683574304.377378 10.8299180.222796911.458220991.1333338611.15 0.46 RATE 5.5971770 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.028 0.023 80.5 1.840 0.023 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jun 29, 02:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org