IOTA/IOTA-ES occultation update for (5144) Achates / TYC 0610-00388-1 event on 2012 Sep 07, 10:10 UT Visible from Mexico Summary ------- On 2012 Sep 07 UT, the 90 km diameter asteroid (5144) Achates will occult a 10.5 mag star in the constellation Pisces for observers along a path across Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.0 mag to 15.5 mag (the magnitude of the asteroid) for at most 7.5 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: UCAC. The event at a glimpse ---------------------- * Rank: 51 * date and approx. time of event: 2012 Sep 07, 10:03 - 2012 Sep 07, 10:19 UT * geocentric midpoint of event [JD]: 2456177.92425417 * magnitude of target star: 10.5 * magnitude drop [mag]: 5.0 * estimated maximum duration [s]: 7.5 * Moon: 60 % sunlit, 48° distance * Sun: 148° distance * rough path description: Mexico The occultation path -------------------- * approximate projected width [km]: 90 * 1 sigma uncertainty interval [path widths]: +/- 1.26 * 1 sigma uncertainty interval [seconds]: +/- 10.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .051 +/- .043) * 1 sigma uncertainty ellipse (major, minor, PA): ( .052", .042", 70° ) * approx speed of asteroid's shadow [km/s]: 12.0305 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0610-00388-1 by 5144 Achates on 2012 Sep 7 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 141 0 0 - 2 24 24 10 19 44 0 76 -27 - 1 59 10 - 2 49 37 - 0 55 30 .. .. .. 142 0 0 - 2 9 17 10 19 44 1 76 -28 - 1 44 2 - 2 34 31 - 0 40 20 - 3 38 4 143 0 0 - 1 54 3 10 19 43 2 76 -29 - 1 28 47 - 2 19 17 - 0 25 3 - 3 22 52 144 0 0 - 1 38 41 10 19 43 3 76 -29 - 1 13 24 - 2 3 56 - 0 9 39 - 3 7 32 145 0 0 - 1 23 12 10 19 42 4 76 -30 - 0 57 55 - 1 48 28 0 5 53 - 2 52 6 146 0 0 - 1 7 36 10 19 42 5 76 -31 - 0 42 19 - 1 32 53 0 21 30 - 2 36 33 147 0 0 - 0 51 54 10 19 41 6 76 -32 - 0 26 36 - 1 17 12 0 37 14 - 2 20 53 148 0 0 - 0 36 7 10 19 39 7 76 -33 - 0 10 48 - 1 1 25 0 53 4 - 2 5 7 149 0 0 - 0 20 13 10 19 38 8 76 -34 0 5 7 - 0 45 32 1 9 0 - 1 49 16 150 0 0 - 0 4 14 10 19 37 9 76 -35 0 21 6 - 0 29 33 1 25 1 - 1 33 19 151 0 0 0 11 50 10 19 35 10 76 -36 0 37 11 - 0 13 30 1 41 7 - 1 17 16 152 0 0 0 27 59 10 19 33 12 76 -37 0 53 20 0 2 39 1 57 17 - 1 1 9 153 0 0 0 44 12 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78 0 0 19 30 17 10 4 36 44 271 -13 19 54 52 19 5 43 20 56 53 18 3 51 - 77 0 0 19 24 52 10 4 30 43 271 -12 19 49 27 19 0 17 20 51 30 17 58 24 - 76 0 0 19 19 12 10 4 24 42 272 -12 19 43 48 18 54 37 20 45 52 17 52 42 - 75 0 0 19 13 17 10 4 18 41 272 -11 19 37 54 18 48 41 20 40 0 17 46 45 - 74 0 0 19 7 8 10 4 13 40 272 -10 19 31 45 18 42 31 20 33 53 17 40 33 - 73 0 0 19 0 44 10 4 7 39 273 -9 19 25 22 18 36 6 20 27 31 17 34 6 - 72 0 0 18 54 5 10 4 2 38 273 -8 19 18 44 18 29 27 20 20 55 17 27 25 - 71 0 0 18 47 12 10 3 56 37 274 -7 19 11 51 18 22 33 20 14 4 17 20 29 - 70 0 0 18 40 4 10 3 51 36 274 -6 19 4 44 18 15 24 20 6 59 17 13 18 - 69 0 0 18 32 41 10 3 46 35 274 -5 18 57 22 18 8 1 19 59 39 17 5 53 - 68 0 0 18 25 4 10 3 41 35 275 -4 18 49 46 18 0 23 19 52 5 16 58 13 - 67 0 0 18 17 13 10 3 36 34 275 -3 18 41 55 17 52 31 19 44 16 16 50 19 - 66 0 0 18 9 7 10 3 31 33 275 -3 18 33 50 17 44 24 19 36 13 16 42 10 - 65 0 0 18 0 47 10 3 27 32 276 -2 18 25 31 17 36 3 19 27 56 16 33 47 - 64 0 0 17 52 13 10 3 22 31 276 -1 18 16 58 17 27 28 19 19 25 16 25 10 Uncertainty in time = +/- 11 secs Prediction of 2012 Jul 21.0 Data for the target star ------------------------ * name: TYC 0610-00388-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 47 24.4468 DE: +13 53 39.794 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .029, .026 ) * V mag [mag]: 10.5 * B mag [mag]: 11.5 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (5144) Achates approx. diameter [km]: 90 approx. diameter ["]: .034 distance from Earth [AU]: 3.63300 * orbital information: orbit source: Preston date of fit: 2012 Jul 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 923 number of rejected observations: 16 time covered by the observations: 1949 May 04 - 2011 Nov 23 1 sigma uncertainty ellipse (major, minor, PA): 0.044, 0.034, 61° remarks: * orbital elements for (5144) Achates : Mean anomaly = 47.22905736 deg Arg. of pericenter = 331.48784939 deg Long. of node = 322.84963313 deg Inclination = 8.90188773 deg Eccentricity = 0.27210784 Semimajor axis = 5.20772699 AU Perihelion dist = 3.79066364 AU Mag: H = 9.06, G = 0.15 Epoch of elements : MJD 56177.42400000 TDT (2012 Sep 07.424) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 7 5144 Achates 10h 10.9m UT 10.5 0 47 24.447 13 53 39.79TYC 0610-00388-1 11.5 15.5 90 7.5 3.633 -1.120 -2.05 -127.7741 13.895 26.74 5.83 10.1821 -0.01030 0.08038 -6.73737 -0.84644 -0.00255 -0.00186 2000 46.6133562012 831.00000331.487849322.849633 8.9018880.27210784 5.2077270 3.7906636 8.9 5.00.15 RATE 0.8293390 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.052 0.042 70 2.26 0.043 0 0-2 4 056129.0020120907_0388-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 21, 15:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org