IOTA/IOTA-ES occultation update for (409) Aspasia / TYC 1349-01375-1 event on 2007 Oct 13, 01:29 UT Visible from Europe, S Russia Summary ------- On 2007 Oct 13 UT, the 162 km diameter asteroid (409) Aspasia will occult a 10.6 mag star in the constellation Gemini for observers along a path across Europe, S Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 12.7 mag (the magnitude of the asteroid) for at most 10.4 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 Oct 13, 01:23 - 2007 Oct 13, 01:36 UT * magnitude of target star: 10.6 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 10.4 * Moon: 3 % sunlit, 112° distance * Sun: 92° distance * rough path description: Europe, S Russia The occultation path -------------------- * approximate projected width [km]: 168 * 1 sigma uncertainty interval [path widths]: +/- 0.23 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .021 +/- .020) * 1 sigma uncertainty ellipse (major, minor, PA): ( .021", .020", 94° ) * approx speed of asteroid's shadow [km/s]: 15.5306 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1349-01375-1 by 409 Aspasia on 2007 Oct 13 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 - 39 0 0 40 10 23 1 23 9 0 67 -55 39 20 53 41 0 5 .. .. .. 41 23 2 - 38 0 0 40 29 37 1 23 9 1 68 -55 39 40 17 41 19 11 39 17 40 41 42 3 - 37 0 0 40 48 24 1 23 9 2 69 -55 39 59 13 41 37 48 39 36 39 42 0 36 - 36 0 0 41 6 42 1 23 9 3 69 -55 40 17 40 41 55 58 39 55 10 42 18 42 - 35 0 0 41 24 33 1 23 10 4 70 -55 40 35 39 42 13 39 40 13 14 42 36 19 - 34 0 0 41 41 55 1 23 10 4 70 -55 40 53 10 42 30 53 40 30 49 42 53 29 - 33 0 0 41 58 50 1 23 11 5 71 -55 41 10 14 42 47 39 40 47 56 43 10 11 - 32 0 0 42 15 17 1 23 11 6 72 -55 41 26 49 43 3 58 41 4 35 43 26 26 - 31 0 0 42 31 17 1 23 12 7 72 -55 41 42 57 43 19 49 41 20 47 43 42 13 - 30 0 0 42 46 49 1 23 13 8 73 -54 41 58 38 43 35 13 41 36 32 43 57 33 - 29 0 0 43 1 54 1 23 14 8 74 -54 42 13 51 43 50 10 41 51 48 44 12 26 - 28 0 0 43 16 32 1 23 14 9 75 -54 42 28 37 44 4 40 42 6 38 44 26 52 - 27 0 0 43 30 43 1 23 15 10 75 -54 42 42 56 44 18 43 42 21 0 44 40 52 - 26 0 0 43 44 27 1 23 16 11 76 -54 42 56 47 44 32 19 42 34 56 44 54 25 - 25 0 0 43 57 45 1 23 17 11 77 -54 43 10 12 44 45 29 42 48 24 45 7 31 - 24 0 0 44 10 36 1 23 19 12 77 -53 43 23 11 44 58 13 43 1 26 45 20 11 - 23 0 0 44 23 1 1 23 20 13 78 -53 43 35 43 45 10 30 43 14 1 45 32 25 - 22 0 0 44 34 59 1 23 21 14 79 -53 43 47 48 45 22 22 43 26 9 45 44 14 - 21 0 0 44 46 32 1 23 22 14 79 -53 43 59 27 45 33 48 43 37 52 45 55 36 - 20 0 0 44 57 38 1 23 24 15 80 -52 44 10 41 45 44 47 43 49 8 46 6 33 - 19 0 0 45 8 19 1 23 25 16 81 -52 44 21 28 45 55 22 43 59 58 46 17 4 - 18 0 0 45 18 35 1 23 27 17 82 -52 44 31 49 46 5 31 44 10 22 46 27 10 - 17 0 0 45 28 24 1 23 28 17 82 -52 44 41 45 46 15 15 44 20 21 46 36 51 - 16 0 0 45 37 49 1 23 30 18 83 -51 44 51 15 46 24 33 44 29 54 46 46 7 - 15 0 0 45 46 48 1 23 32 19 84 -51 45 0 20 46 33 27 44 39 1 46 54 58 - 14 0 0 45 55 23 1 23 34 19 85 -51 45 9 0 46 41 56 44 47 43 47 3 25 - 13 0 0 46 3 32 1 23 35 20 85 -50 45 17 15 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- 3 56 44 1 36 1 16 290 71 - 4 47 3 - 3 6 11 - 5 10 7 - 2 42 51 135 0 0 - 4 24 4 1 36 3 15 290 72 - 5 14 13 - 3 33 41 - 5 37 12 - 3 10 25 136 0 0 - 4 50 52 1 36 5 14 289 73 - 5 40 51 - 4 0 39 - 6 3 46 - 3 37 27 137 0 0 - 5 17 7 1 36 7 13 289 74 - 6 6 57 - 4 27 4 - 6 29 47 - 4 3 57 138 0 0 - 5 42 51 1 36 9 12 289 75 - 6 32 30 - 4 52 57 - 6 55 16 - 4 29 55 139 0 0 - 6 8 1 1 36 10 11 289 76 - 6 57 31 - 5 18 17 - 7 20 13 - 4 55 19 140 0 0 - 6 32 39 1 36 12 10 289 77 - 7 21 59 - 5 43 4 - 7 44 37 - 5 20 11 141 0 0 - 6 56 43 1 36 13 9 289 79 - 7 45 55 - 6 7 18 - 8 8 28 - 5 44 29 142 0 0 - 7 20 14 1 36 14 8 289 80 - 8 9 17 - 6 30 58 - 8 31 46 - 6 8 14 143 0 0 - 7 43 12 1 36 15 7 289 81 - 8 32 5 - 6 54 5 - 8 54 30 - 6 31 25 144 0 0 - 8 5 36 1 36 16 6 289 82 - 8 54 21 - 7 16 38 - 9 16 42 - 6 54 2 145 0 0 - 8 27 27 1 36 17 5 288 82 - 9 16 3 - 7 38 38 - 9 38 20 - 7 16 6 146 0 0 - 8 48 44 1 36 17 4 288 83 - 9 37 11 - 8 0 4 - 9 59 24 - 7 37 36 147 0 0 - 9 9 27 1 36 18 3 288 84 - 9 57 46 - 8 20 55 -10 19 55 - 7 58 31 148 0 0 - 9 29 36 1 36 18 1 288 85 -10 17 47 - 8 41 13 -10 39 52 - 8 18 53 149 0 0 - 9 49 12 1 36 18 0 288 86 -10 37 14 - 9 0 57 -10 59 16 - 8 38 41 Data for the target star ------------------------ * name: TYC 1349-01375-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 11 04.1735 DE: +17 31 38.855 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .019 ) * V mag [mag]: 10.6 * B mag [mag]: 11.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (409) Aspasia approx. diameter [km]: 162 approx. diameter ["]: .089 distance from Earth [AU]: 2.50200 * orbital information: orbit source: Preston date of fit: 2007 Oct 09 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1085 number of rejected observations: 139 time covered by the observations: 1902 Jul 07 - 2007 Sep 19 1 sigma uncertainty ellipse (major, minor, PA): 0.010, 0.007, 107° remarks: * orbital elements for (409) Aspasia : Mean anomaly = 215.20251559 deg Arg. of pericenter = 352.66324128 deg Long. of node = 242.36328392 deg Inclination = 11.24347598 deg Eccentricity = 0.07051627 Semimajor axis = 2.57687604 AU Perihelion dist = 2.39516434 AU Mag: H = 7.61, G = 0.29 Epoch of elements : MJD 54386.06200000 TDT (2007 Oct 13.062) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 13 409 Aspasia 1h 29.7m UT 10.6 7 11 4.173 17 31 38.86TYC 1349-01375-1 11.5 12.7 162 10.4 2.502 1.931 -13.65 64.095 17.531 154.18 -7.57 1.4955 .12262 .24520 7.85967 -3.88159 -0.00573 0.00073 2000 213.758141200710 7.00000352.663241242.363284 11.2434760.070516272.576876042.395164347.625 0.29 RATE 2.3826700 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.021 0.020 93.9 1.230 0.020 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Oct 10, 02:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org