IOTA/IOTA-ES occultation update for (3052) Herzen / HIP 82621 event on 2007 Oct 03, 11:48 UT Visible from S Australia Summary ------- On 2007 Oct 03 UT, the 15 km diameter asteroid (3052) Herzen will occult a 5.9 mag star in the constellation Ophiuchus for observers along a path across S Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 12.4 mag to 18.3 mag (the magnitude of the asteroid) for at most 0.5 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: . The event at a glimpse ---------------------- * Rank: 11 * date and approx. time of event: 2007 Oct 03, 11:44 - 2007 Oct 03, 11:51 UT * midpoint of event [JD]: 2454376.99180833 * magnitude of target star: 5.9 * magnitude drop [mag]: 12.4 * estimated maximum duration [s]: 0.5 * Moon: 50 % sunlit, 153° distance * Sun: 65° distance * rough path description: S Australia Additional comments ------------------- possible double star The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 6.04 * 1 sigma uncertainty interval [seconds]: +/- 2.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .044 +/- .042) * 1 sigma uncertainty ellipse (major, minor, PA): ( .044", .042", 90° ) * approx speed of asteroid's shadow [km/s]: 31.0895 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 82621 by 3052 Herzen on 2007 Oct 03 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 - 29 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -12 5 19 .. .. .. - 28 0 0 -11 27 47 11 44 57 1 111 60 -11 32 22 -11 23 11 -12 27 59 .. .. .. - 27 0 0 -11 50 31 11 44 57 2 110 61 -11 55 7 -11 45 56 -12 50 47 .. .. .. - 26 0 0 -12 13 24 11 44 58 3 110 62 -12 18 0 -12 8 48 -13 13 43 .. .. .. - 25 0 0 -12 36 25 11 44 58 4 110 63 -12 41 1 -12 31 48 -13 36 47 .. .. .. - 24 0 0 -12 59 32 11 44 58 5 110 64 -13 4 8 -12 54 56 -13 59 58 .. .. .. - 23 0 0 -13 22 46 11 44 58 6 110 64 -13 27 23 -13 18 10 -14 23 15 -12 22 40 - 22 0 0 -13 46 6 11 44 59 7 109 65 -13 50 43 -13 41 29 -14 46 37 -12 45 57 - 21 0 0 -14 9 32 11 44 59 8 109 66 -14 14 9 -14 4 55 -15 10 6 -13 9 20 - 20 0 0 -14 33 2 11 45 0 9 109 67 -14 37 39 -14 28 25 -15 33 38 -13 32 48 - 19 0 0 -14 56 36 11 45 1 10 109 67 -15 1 14 -14 51 59 -15 57 15 -13 56 20 - 18 0 0 -15 20 14 11 45 1 11 108 68 -15 24 52 -15 15 37 -16 20 55 -14 19 56 - 17 0 0 -15 43 55 11 45 2 12 108 69 -15 48 33 -15 39 18 -16 44 38 -14 43 35 - 16 0 0 -16 7 39 11 45 3 13 108 69 -16 12 17 -16 3 1 -17 8 23 -15 7 17 - 15 0 0 -16 31 24 11 45 4 14 107 70 -16 36 2 -16 26 46 -17 32 10 -15 31 1 - 14 0 0 -16 55 11 11 45 5 15 107 70 -16 59 49 -16 50 33 -17 55 58 -15 54 46 - 13 0 0 -17 18 58 11 45 6 16 107 71 -17 23 36 -17 14 20 -18 19 46 -16 18 32 - 12 0 0 -17 42 45 11 45 7 17 106 71 -17 47 23 -17 38 7 -18 43 35 -16 42 18 - 11 0 0 -18 6 32 11 45 8 19 106 72 -18 11 10 -18 1 54 -19 7 22 -17 6 4 - 10 0 0 -18 30 18 11 45 10 20 106 72 -18 34 56 -18 25 39 -19 31 8 -17 29 49 - 9 0 0 -18 54 1 11 45 11 21 105 72 -18 58 40 -18 49 23 -19 54 52 -17 53 33 - 8 0 0 -19 17 43 11 45 12 22 105 72 -19 22 21 -19 13 5 -20 18 34 -18 17 14 - 7 0 0 -19 41 22 11 45 14 23 105 72 -19 46 0 -19 36 43 -20 42 13 -18 40 53 - 6 0 0 -20 4 57 11 45 15 24 104 73 -20 9 35 -20 0 19 -21 5 48 -19 4 28 - 5 0 0 -20 28 28 11 45 17 25 104 72 -20 33 6 -20 23 50 -21 29 18 -19 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6 250 -54 -24 45 41 -24 36 27 -25 41 33 -23 40 57 158 0 0 -24 19 4 11 51 27 5 250 -55 -24 23 41 -24 14 27 -25 19 35 .. .. .. 159 0 0 -23 56 54 11 51 27 4 249 -56 -24 1 31 -23 52 17 -24 57 28 .. .. .. 160 0 0 -23 34 35 11 51 27 3 249 -57 -23 39 12 -23 29 58 -24 35 11 .. .. .. 161 0 0 -23 12 7 11 51 27 2 248 -58 -23 16 44 -23 7 30 -24 12 45 .. .. .. 162 0 0 -22 49 31 11 51 27 1 248 -58 -22 54 9 -22 44 54 -23 50 11 .. .. .. 163 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -23 27 29 .. .. .. Data for the target star ------------------------ * name: HIP 82621 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 53 25.1866 DE: -20 24 56.206 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .015, .014 ) * V mag [mag]: 5.9 * B mag [mag]: 6.5 * Apparent position with proper motion RA(deg): 253.4687527782 DE(deg): -20.4299915827 * Equation of equinoxes (radians) : 0.000029736054741 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3052) Herzen approx. diameter [km]: 15 approx. diameter ["]: .007 distance from Earth [AU]: 2.76600 * orbital information: orbit source: Preston date of fit: 2007 Aug 01 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 576 number of rejected observations: 6 time covered by the observations: 1976 Dec 16 - 2007 Jun 21 1 sigma uncertainty ellipse (major, minor, PA): 0.041, 0.040, 90° remarks: * orbital elements for (3052) Herzen : Mean anomaly = 97.70025105 deg Arg. of pericenter = 279.58427504 deg Long. of node = 238.61255229 deg Inclination = 3.90051012 deg Eccentricity = 0.18282628 Semimajor axis = 2.37500522 AU Perihelion dist = 1.94079185 AU Mag: H = 13.42, G = 0.15 Epoch of elements : MJD 54376.49200000 TDT (2007 Oct 03.492) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 03 3052 Herzen 11h 48.2m UT 5.9 16 53 25.187-20 24 56.21HIP 82621 6.6 18.3 15 0.5 2.766 3.946 -5.91 64.499 -20.414 0.24 -3.92 11.8034 -.03343 -.30627 17.44880 -1.86128 0.00508 -0.00050 2000 95.95207262007 927.00000279.584275238.612552 3.9005100.182826282.375005221.9407918513.15 0.15 RATE 2.6928194 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.044 0.042 90.0 7.040 0.042 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 03, 05:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org