IOTA/IOTA-ES occultation update for (121) Hermione / HIP 87589 event on 2007 Oct 09, 22:44 UT Visible from Brazil Summary ------- On 2007 Oct 09 UT, the 209 km diameter asteroid (121) Hermione will occult a 6.9 mag star in the constellation Sagittarius for observers along a path across Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.6 mag to 13.5 mag (the magnitude of the asteroid) for at most 8.6 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: . The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2007 Oct 09, 22:40 - 2007 Oct 09, 22:48 UT * magnitude of target star: 6.9 * magnitude drop [mag]: 6.6 * estimated maximum duration [s]: 8.6 * Moon: 1 % sunlit, 86° distance * Sun: 72° distance * rough path description: Brazil The occultation path -------------------- * approximate projected width [km]: 212 * 1 sigma uncertainty interval [path widths]: +/- 0.20 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .023 +/- .016) * 1 sigma uncertainty ellipse (major, minor, PA): ( .023", .016", 92° ) * approx speed of asteroid's shadow [km/s]: 24.4214 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 87589 by 121 Hermione on 2007 Oct 09 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 -175 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 8 46 48 .. .. .. -174 0 0 9 46 16 22 40 14 1 118 71 8 41 25 10 51 20 8 15 32 .. .. .. -173 0 0 9 14 57 22 40 14 2 118 72 8 10 7 10 20 1 7 44 15 10 46 7 -172 0 0 8 43 38 22 40 14 3 118 73 7 38 49 9 48 41 7 12 57 10 14 46 -171 0 0 8 12 20 22 40 15 4 118 74 7 7 32 9 17 21 6 41 41 9 43 26 -170 0 0 7 41 2 22 40 15 5 118 74 6 36 16 8 46 2 6 10 25 9 12 6 -169 0 0 7 9 47 22 40 15 6 119 75 6 5 3 8 14 44 5 39 13 8 40 48 -168 0 0 6 38 34 22 40 16 7 119 76 5 33 53 7 43 29 5 8 4 8 9 32 -167 0 0 6 7 26 22 40 17 8 119 77 5 2 47 7 12 18 4 36 59 7 38 19 -166 0 0 5 36 22 22 40 18 10 119 78 4 31 46 6 41 12 4 6 0 7 7 12 -165 0 0 5 5 24 22 40 18 11 119 78 4 0 52 6 10 10 3 35 6 6 36 9 -164 0 0 4 34 32 22 40 20 12 119 79 3 30 4 5 39 15 3 4 20 6 5 12 -163 0 0 4 3 48 22 40 21 13 119 80 2 59 23 5 8 27 2 33 41 5 34 23 -162 0 0 3 33 13 22 40 22 14 119 80 2 28 52 4 37 47 2 3 11 5 3 41 -161 0 0 3 2 46 22 40 23 15 119 80 1 58 29 4 7 16 1 32 50 4 33 8 -160 0 0 2 32 29 22 40 25 16 119 80 1 28 17 3 36 54 1 2 40 4 2 45 -159 0 0 2 2 23 22 40 26 17 119 81 0 58 17 3 6 43 0 32 41 3 32 32 -158 0 0 1 32 29 22 40 28 18 120 80 0 28 28 2 36 44 0 2 54 3 2 30 -157 0 0 1 2 47 22 40 29 20 120 80 - 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Data for the target star ------------------------ * name: HIP 87589 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 53 34.2318 DE: -27 16 57.497 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .020, .014 ) * V mag [mag]: 6.9 * B mag [mag]: 7.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (121) Hermione approx. diameter [km]: 209 approx. diameter ["]: .082 distance from Earth [AU]: 3.50800 * orbital information: orbit source: Preston date of fit: 2007 Sep 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 918 number of rejected observations: 120 time covered by the observations: 1904 May 16 - 2007 Jul 19 1 sigma uncertainty ellipse (major, minor, PA): 0.011, 0.008, 100° remarks: * orbital elements for (121) Hermione : Mean anomaly = 290.38550103 deg Arg. of pericenter = 297.16455136 deg Long. of node = 73.20069317 deg Inclination = 7.60146178 deg Eccentricity = 0.13631618 Semimajor axis = 3.44976910 AU Perihelion dist = 2.97950975 AU Mag: H = 7.19, G = 0.15 Epoch of elements : MJD 54382.94800000 TDT (2007 Oct 09.948) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 09 121 Hermione 22h 44.5m UT 6.9 17 53 34.232-27 16 57.50HIP 87589 7.1 13.5 209 8.6 3.508 2.592 -0.72 -90.904 -27.282 -164.31 -6.40 22.7419 .00262 .17422 13.78108 -0.28810 0.00563 -0.00018 2000 289.932033200710 7.00000297.164551 73.200693 7.6014620.136316183.449769102.979509757.315 0.15 RATE 1.5382220 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.023 0.016 92.3 1.200 0.016 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 25, 23:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org