IOTA/IOTA-ES occultation update for (949) Hel / TYC 2343-01853-1 event on 2007 Nov 02, 11:17 UT Visible from NE Australia Summary ------- On 2007 Nov 02 UT, the 69 km diameter asteroid (949) Hel will occult a 10.3 mag star in the constellation Perseus for observers along a path across NE Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.7 mag to 15.0 mag (the magnitude of the asteroid) for at most 4.6 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: 76 * date and approx. time of event: 2007 Nov 02, 11:11 - 2007 Nov 02, 11:23 UT * magnitude of target star: 10.3 * magnitude drop [mag]: 4.7 * estimated maximum duration [s]: 4.6 * Moon: 44 % sunlit, 83° distance * Sun: 160° distance * rough path description: NE Australia The occultation path -------------------- * approximate projected width [km]: 80 * 1 sigma uncertainty interval [path widths]: +/- 0.73 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .027", 80° ) * approx speed of asteroid's shadow [km/s]: 14.9914 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2343-01853-1 by 949 Hel on 2007 Nov 02 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 130 0 0 .. .. .. .. .. .. .. .. .. -33 4 48 .. .. .. .. .. .. .. .. .. 131 0 0 -32 50 32 11 23 12 1 49 -20 -32 21 44 -33 19 31 .. .. .. -34 2 12 132 0 0 -32 7 17 11 23 12 2 49 -21 -31 38 33 -32 36 12 .. .. .. -33 18 47 133 0 0 -31 23 56 11 23 11 3 48 -22 -30 55 16 -31 52 47 .. .. .. -32 35 16 134 0 0 -30 40 30 11 23 10 4 47 -23 -30 11 55 -31 9 17 -29 30 30 -31 51 40 135 0 0 -29 57 3 11 23 10 5 47 -24 -29 28 32 -30 25 45 -28 47 15 -31 8 0 136 0 0 -29 13 35 11 23 9 7 46 -25 -28 45 10 -29 42 12 -28 3 59 -30 24 20 137 0 0 -28 30 9 11 23 7 8 46 -27 -28 1 49 -28 58 41 -27 20 46 -29 40 40 138 0 0 -27 46 46 11 23 6 9 46 -28 -27 18 32 -28 15 12 -26 37 37 -28 57 3 139 0 0 -27 3 29 11 23 5 10 45 -29 -26 35 20 -27 31 49 -25 54 34 -28 13 30 140 0 0 -26 20 18 11 23 3 11 45 -30 -25 52 16 -26 48 32 -25 11 38 -27 30 4 141 0 0 -25 37 17 11 23 1 12 44 -31 -25 9 20 -26 5 24 -24 28 52 -26 46 46 142 0 0 -24 54 25 11 22 59 13 44 -32 -24 26 36 -25 22 26 -23 46 16 -26 3 38 143 0 0 -24 11 46 11 22 56 14 43 -33 -23 44 3 -24 39 40 -23 3 54 -25 20 42 144 0 0 -23 29 21 11 22 54 16 43 -35 -23 1 45 -23 57 7 -22 21 45 -24 37 59 145 0 0 -22 47 11 11 22 51 17 42 -36 -22 19 43 -23 14 51 -21 39 53 -23 55 32 146 0 0 -22 5 19 11 22 48 18 42 -37 -21 37 57 -22 32 50 -20 58 18 -23 13 21 147 0 0 -21 23 45 11 22 45 19 41 -38 -20 56 30 -21 51 9 -20 17 2 -22 31 28 148 0 0 -20 42 30 11 22 42 20 41 -39 -20 15 24 -21 9 47 -19 36 5 -21 49 54 149 0 0 -20 1 38 11 22 38 21 41 -40 -19 34 38 -20 28 46 -18 55 31 -21 8 42 150 0 0 -19 21 7 11 22 34 22 40 -41 -18 54 16 -19 48 8 -18 15 19 -20 27 53 151 0 0 -18 41 1 11 22 31 23 40 -43 -18 14 17 -19 7 54 -17 35 32 -19 47 27 152 0 0 -18 1 20 11 22 27 25 39 -44 -17 34 44 -18 28 6 -16 56 10 -19 7 26 153 0 0 -17 22 6 11 22 22 26 39 -45 -16 55 37 -17 48 43 -16 17 14 -18 27 52 154 0 0 -16 43 19 11 22 18 27 38 -46 -16 16 58 -17 9 48 -15 38 46 -17 48 45 155 0 0 -16 5 0 11 22 14 28 38 -47 -15 38 47 -16 31 21 -15 0 47 -17 10 7 156 0 0 -15 27 11 11 22 9 29 37 -48 -15 1 6 -15 53 24 -14 23 16 -16 31 58 157 0 0 -14 49 52 11 22 4 30 37 -49 -14 23 55 -15 15 58 -13 46 17 -15 54 19 158 0 0 -14 13 5 11 21 59 31 36 -50 -13 47 16 -14 39 3 -13 9 48 -15 17 12 159 0 0 -13 36 50 11 21 54 32 36 -52 -13 11 8 -14 2 39 -12 33 52 -14 40 38 160 0 0 -13 1 7 11 21 49 33 35 -53 -12 35 34 -13 26 49 -11 58 28 -14 4 36 161 0 0 -12 25 59 11 21 44 34 35 -54 -12 0 33 -12 51 33 -11 23 38 -13 29 8 162 0 0 -11 51 24 11 21 38 35 34 -55 -11 26 6 -12 16 51 -10 49 22 -12 54 14 163 0 0 -11 17 25 11 21 32 36 34 -56 -10 52 14 -11 42 44 -10 15 41 -12 19 56 164 0 0 -10 44 1 11 21 27 37 33 -57 -10 18 57 -11 9 12 - 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Data for the target star ------------------------ * name: TYC 2343-01853-1 * constellation : Perseus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 08 11.6377 DE: +32 51 06.713 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .016, .016 ) * V mag [mag]: 10.3 * B mag [mag]: 11.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (949) Hel approx. diameter [km]: 69 approx. diameter ["]: .037 distance from Earth [AU]: 2.59600 * orbital information: orbit source: Preston date of fit: 2007 Oct 23 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 704 number of rejected observations: 80 time covered by the observations: 1931 Jan 11 - 2007 Sep 25 1 sigma uncertainty ellipse (major, minor, PA): 0.026, 0.022, 76° remarks: * orbital elements for (949) Hel : Mean anomaly = 208.41519221 deg Arg. of pericenter = 248.63200719 deg Long. of node = 321.57356774 deg Inclination = 10.69199155 deg Eccentricity = 0.19917320 Semimajor axis = 2.99751160 AU Perihelion dist = 2.40048763 AU Mag: H = 9.66, G = 0.15 Epoch of elements : MJD 54406.47000000 TDT (2007 Nov 02.470) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Nov 02 949 Hel 11h 17.1m UT 10.3 3 8 11.638 32 51 6.71TYC 2343-01853-1 11.1 15.0 69 4.6 2.596 -2.241 -4.93 -163.586 32.853 6.62 -14.71 11.2853 .08844 -.50571 -8.33597 -1.45241 -0.00103 -0.00183 2000 207.18643220071027.00000248.632007321.573568 10.6919920.199173202.997511602.40048763 9.75 0.15 RATE 1.8991650 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.031 0.027 79.9 1.730 0.027 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Oct 23, 22:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org