IOTA/IOTA-ES occultation update for (2408) Astapovich / TYC 5742-01497-1 event on 2012 Sep 23, 20:26 UT Visible from Africa Summary ------- On 2012 Sep 23 UT, the 20 km diameter asteroid (2408) Astapovich will occult a 10.4 mag star in the constellation Aquila for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.8 mag to 16.2 mag (the magnitude of the asteroid) for at most 1.7 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: 30 * date and approx. time of event: 2012 Sep 23, 20:19 - 2012 Sep 23, 20:35 UT * geocentric midpoint of event [JD]: 2456194.35210417 * magnitude of target star: 10.4 * magnitude drop [mag]: 5.8 * estimated maximum duration [s]: 1.7 * Moon: 62 % sunlit, 16° distance * Sun: 118° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 2.27 * 1 sigma uncertainty interval [seconds]: +/- 3.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .042 +/- .040) * 1 sigma uncertainty ellipse (major, minor, PA): ( .042", .040", 93° ) * approx speed of asteroid's shadow [km/s]: 11.4320 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5742-01497-1 by 2408 Astapovich on 2012 Sep 23 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 ' " Longitude Longitude Longitude Longitude Latitude Latitude Latitude Latitude - 37 0 0 39 36 36 20 19 47 33 146 0 39 28 44 39 44 28 38 53 8 40 20 18 - 36 0 0 38 51 29 20 19 53 34 146 -1 38 43 35 38 59 24 38 7 47 39 35 25 - 35 0 0 38 5 23 20 20 0 35 147 -2 37 57 26 38 13 20 37 21 27 38 49 33 - 34 0 0 37 18 19 20 20 7 36 148 -3 37 10 20 37 26 19 36 34 10 38 2 42 - 33 0 0 36 30 17 20 20 14 37 149 -4 36 22 16 36 38 19 35 45 56 37 14 54 - 32 0 0 35 41 19 20 20 21 38 150 -4 35 33 15 35 49 23 34 56 46 36 26 7 - 31 0 0 34 51 25 20 20 28 39 150 -5 34 43 19 34 59 31 34 6 40 35 36 25 - 30 0 0 34 0 36 20 20 36 40 151 -6 33 52 28 34 8 44 33 15 40 34 45 47 - 29 0 0 33 8 54 20 20 45 42 152 -7 33 0 44 33 17 4 32 23 48 33 54 14 - 28 0 0 32 16 19 20 20 53 43 153 -8 32 8 8 32 24 31 31 31 5 33 1 50 - 27 0 0 31 22 55 20 21 2 44 154 -9 31 14 42 31 31 8 30 37 32 32 8 34 - 26 0 0 30 28 42 20 21 11 45 155 -10 30 20 28 30 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59 20 35 38 12 263 -58 -24 16 41 -24 5 16 -24 42 34 -23 39 17 71 0 0 -24 7 41 20 35 40 11 263 -58 -24 13 24 -24 1 58 -24 39 18 -23 35 59 72 0 0 -24 3 42 20 35 41 10 262 -57 -24 9 25 -23 57 59 -24 35 20 -23 31 58 73 0 0 -23 59 2 20 35 43 9 262 -56 -24 4 45 -23 53 18 -24 30 41 -23 27 16 74 0 0 -23 53 39 20 35 44 8 261 -56 -23 59 23 -23 47 55 -24 25 21 -23 21 51 75 0 0 -23 47 34 20 35 46 7 261 -55 -23 53 18 -23 41 50 -24 19 18 -23 15 44 76 0 0 -23 40 48 20 35 47 6 261 -54 -23 46 32 -23 35 3 -24 12 34 -23 8 55 77 0 0 -23 33 19 20 35 48 5 260 -54 -23 39 4 -23 27 34 -24 5 9 -23 1 23 78 0 0 -23 25 8 20 35 49 4 260 -53 -23 30 54 -23 19 22 -23 57 1 -22 53 9 79 0 0 -23 16 15 20 35 49 3 259 -52 -23 22 1 -23 10 28 -23 48 11 -22 44 12 80 0 0 -23 6 39 20 35 50 2 259 -52 -23 12 26 -23 0 52 -23 38 40 -22 34 33 81 0 0 -22 56 21 20 35 50 2 259 -51 -23 2 9 -22 50 33 .. .. .. -22 24 11 82 0 0 -22 45 20 20 35 50 1 258 -50 -22 51 9 -22 39 31 .. .. .. -22 13 5 Uncertainty in time = +/- 4 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: TYC 5742-01497-1 * constellation : Aquila * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 59 23.4336 DE: -11 06 25.886 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .023 ) * V mag [mag]: 10.4 * B mag [mag]: 11.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2408) Astapovich approx. diameter [km]: 20 approx. diameter ["]: .018 distance from Earth [AU]: 1.51600 * orbital information: orbit source: Preston date of fit: 2012 Aug 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 715 number of rejected observations: 15 time covered by the observations: 1943 Apr 08 - 2012 Aug 08 1 sigma uncertainty ellipse (major, minor, PA): 0.035, 0.033, 94° remarks: * orbital elements for (2408) Astapovich : Mean anomaly = 34.67537418 deg Arg. of pericenter = 102.97101318 deg Long. of node = 164.48333198 deg Inclination = 17.69265131 deg Eccentricity = 0.24333796 Semimajor axis = 2.63679751 AU Perihelion dist = 1.99516458 AU Mag: H = 11.90, G = 0.15 Epoch of elements : MJD 56193.85200000 TDT (2012 Sep 23.852) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 23 2408 Astapovich 20h 27.0m UT 10.4 19 59 23.434-11 6 25.89TYC 5742-01497-1 11.0 16.2 20 1.7 1.516 1.907 -24.73 -9.9956 -11.100 -128.73 -0.48 20.4505 0.20997 0.23676 4.83929 -4.26811 0.00474 0.00055 2000 33.7886772012 920.00000102.971013164.483332 17.6926510.24333796 2.6367975 1.995164612.5 5.00.15 RATE 2.3019130 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.042 0.040 93 3.27 0.041 0 0-4 4 056165.0020120923_1497-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 25, 23:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org