IOTA/IOTA-ES occultation update for (409) Aspasia / TYC 1327-00077-1 event on 2007 Aug 29, 09:36 UT Visible from S USA, N Mexico Summary ------- On 2007 Aug 29 UT, the 162 km diameter asteroid (409) Aspasia will occult a 10.3 mag star in the constellation Gemini for observers along a path across S USA, N Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.9 mag to 13.1 mag (the magnitude of the asteroid) for at most 5.3 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: 99 * date and approx. time of event: 2007 Aug 29, 09:32 - 2007 Aug 29, 09:39 UT * magnitude of target star: 10.3 * magnitude drop [mag]: 2.9 * estimated maximum duration [s]: 5.3 * Moon: 99 % sunlit, 106° distance * Sun: 61° distance * rough path description: S USA, N Mexico The occultation path -------------------- * approximate projected width [km]: 165 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .017 +/- .017) * 1 sigma uncertainty ellipse (major, minor, PA): ( .017", .017", 93° ) * approx speed of asteroid's shadow [km/s]: 30.7584 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1327-00077-1 by 409 Aspasia on 2007 Aug 29 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 -123 0 0 .. .. .. .. .. .. .. .. .. .. .. .. 20 18 42 .. .. .. 20 42 2 -122 0 0 19 53 26 9 32 59 1 68 -54 19 5 8 20 41 53 18 42 0 21 5 11 -121 0 0 20 16 27 9 32 59 2 68 -53 19 28 12 21 4 50 19 5 5 21 28 7 -120 0 0 20 39 15 9 32 59 3 69 -52 19 51 3 21 27 35 19 27 57 21 50 50 -119 0 0 21 1 49 9 32 59 4 69 -52 20 13 40 21 50 6 19 50 36 22 13 20 -118 0 0 21 24 8 9 32 59 5 69 -51 20 36 3 22 12 22 20 13 1 22 35 35 -117 0 0 21 46 14 9 33 0 6 70 -50 20 58 12 22 34 24 20 35 12 22 57 35 -116 0 0 22 8 5 9 33 0 7 70 -49 21 20 6 22 56 12 20 57 7 23 19 20 -115 0 0 22 29 40 9 33 1 8 71 -48 21 41 45 23 17 43 21 18 48 23 40 50 -114 0 0 22 51 0 9 33 1 9 71 -47 22 3 9 23 38 59 21 40 13 24 2 5 -113 0 0 23 12 4 9 33 2 10 71 -46 22 24 16 23 59 59 22 1 23 24 23 3 -112 0 0 23 32 51 9 33 2 11 72 -45 22 45 8 24 20 43 22 22 16 24 43 44 -111 0 0 23 53 22 9 33 3 12 72 -44 23 5 42 24 41 10 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39 38 16 290 76 6 17 36 7 55 4 5 54 17 8 18 33 50 0 0 6 40 46 9 39 39 15 290 75 5 52 8 7 29 32 5 28 51 7 53 0 51 0 0 6 15 22 9 39 40 14 290 74 5 26 47 7 4 6 5 3 31 7 27 33 52 0 0 5 50 5 9 39 41 13 290 73 5 1 33 6 38 47 4 38 17 7 2 13 53 0 0 5 24 56 9 39 41 11 290 72 4 36 26 6 13 35 4 13 12 6 37 0 54 0 0 4 59 55 9 39 42 10 290 71 4 11 28 5 48 32 3 48 15 6 11 55 55 0 0 4 35 3 9 39 43 9 290 70 3 46 38 5 23 36 3 23 27 5 46 58 56 0 0 4 10 20 9 39 43 8 291 69 3 21 58 4 58 50 2 58 48 5 22 11 57 0 0 3 45 46 9 39 44 7 291 68 2 57 28 4 34 14 2 34 19 4 57 33 58 0 0 3 21 24 9 39 44 6 291 67 2 33 8 4 9 48 2 10 1 4 33 6 59 0 0 2 57 12 9 39 45 5 291 66 2 9 0 3 45 33 1 45 54 4 8 49 60 0 0 2 33 12 9 39 45 4 291 65 1 45 3 3 21 30 1 21 59 3 44 44 61 0 0 2 9 24 9 39 45 3 291 63 1 21 18 2 57 38 0 58 16 3 20 50 62 0 0 1 45 48 9 39 46 2 291 62 0 57 47 2 33 59 0 34 46 2 57 10 63 0 0 1 22 26 9 39 46 1 291 61 0 34 28 2 10 33 0 11 29 2 33 42 64 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 2 10 28 Data for the target star ------------------------ * name: TYC 1327-00077-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 21 10.2012 DE: +20 55 52.911 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .015, .016 ) * V mag [mag]: 10.3 * B mag [mag]: 10.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (409) Aspasia approx. diameter [km]: 162 approx. diameter ["]: .072 distance from Earth [AU]: 3.09400 * orbital information: orbit source: Preston date of fit: 2007 Aug 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1067 number of rejected observations: 139 time covered by the observations: 1902 Jul 07 - 2007 Jan 28 1 sigma uncertainty ellipse (major, minor, PA): 0.008, 0.006, 104° remarks: * orbital elements for (409) Aspasia : Mean anomaly = 204.56995033 deg Arg. of pericenter = 352.65614688 deg Long. of node = 242.36366936 deg Inclination = 11.24369717 deg Eccentricity = 0.07054245 Semimajor axis = 2.57683062 AU Perihelion dist = 2.39505467 AU Mag: H = 7.61, G = 0.29 Epoch of elements : MJD 54341.40000000 TDT (2007 Aug 29.400) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 29 409 Aspasia 9h 36.4m UT 10.3 6 21 10.201 20 55 52.91TYC 1327-00077-1 10.3 13.1 162 5.3 3.094 3.470 -8.44 -26.019 20.934 36.18 9.42 9.6062 .03384 .18841 17.10503 -2.96974 -0.00486 0.00006 2000 204.2363672007 828.00000352.656147242.363669 11.2436970.070542452.576830622.395054677.625 0.29 RATE 2.3827320 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.017 0.017 93.0 1.240 0.017 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Aug 28, 22:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org