IOTA/IOTA-ES occultation update for (718) Erida / UCAC2 24745401 event on 2012 Sep 06, 03:02 UT Visible from Africa, Brazil, Peru Summary ------- On 2012 Sep 06 UT, the 68 km diameter asteroid (718) Erida will occult a 11.4 mag star in the constellation Aquarius for observers along a path across Africa, Brazil, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.1 mag to 14.4 mag (the magnitude of the asteroid) for at most 5.1 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: 45 * date and approx. time of event: 2012 Sep 06, 02:54 - 2012 Sep 06, 03:10 UT * geocentric midpoint of event [JD]: 2456176.62679583 * magnitude of target star: 11.4 * magnitude drop [mag]: 3.1 * estimated maximum duration [s]: 5.1 * Moon: 72 % sunlit, 75° distance * Sun: 166° distance * rough path description: Africa, Brazil, Peru The occultation path -------------------- * approximate projected width [km]: 69 * 1 sigma uncertainty interval [path widths]: +/- 1.44 * 1 sigma uncertainty interval [seconds]: +/- 7.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .060 +/- .059) * 1 sigma uncertainty ellipse (major, minor, PA): ( .060", .059", 86° ) * approx speed of asteroid's shadow [km/s]: 13.4244 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 24745401 by 718 Erida on 2012 Sep 6 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 -138 0 0 - 4 44 57 3 10 16 8 108 -1 - 4 25 16 - 5 4 37 - 3 28 23 - 6 1 8 -137 0 0 - 5 2 25 3 10 14 9 108 -2 - 4 42 45 - 5 22 3 - 3 45 58 - 6 18 28 -136 0 0 - 5 19 31 3 10 13 10 108 -3 - 4 59 53 - 5 39 7 - 4 3 12 - 6 35 27 -135 0 0 - 5 36 15 3 10 11 11 108 -4 - 5 16 39 - 5 55 49 - 4 20 3 - 6 52 3 -134 0 0 - 5 52 37 3 10 10 12 108 -5 - 5 33 2 - 6 12 9 - 4 36 32 - 7 8 18 -133 0 0 - 6 8 36 3 10 8 13 108 -6 - 5 49 4 - 6 28 7 - 4 52 39 - 7 24 10 -132 0 0 - 6 24 13 3 10 6 14 108 -7 - 6 4 43 - 6 43 42 - 5 8 23 - 7 39 41 -131 0 0 - 6 39 28 3 10 4 15 107 -8 - 6 19 59 - 6 58 55 - 5 23 45 - 7 54 48 -130 0 0 - 6 54 20 3 10 1 16 107 -9 - 6 34 53 - 7 13 45 - 5 38 43 - 8 9 33 -129 0 0 - 7 8 49 3 9 59 17 107 -10 - 6 49 24 - 7 28 12 - 5 53 19 - 8 23 56 -128 0 0 - 7 22 55 3 9 56 18 107 -11 - 7 3 31 - 7 42 17 - 6 7 32 - 8 37 55 -127 0 0 - 7 36 38 3 9 53 19 107 -12 - 7 17 16 - 7 55 58 - 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16 0 0 6 18 10 2 57 27 47 234 -59 6 38 36 5 57 45 7 37 37 4 59 9 - 15 0 0 6 42 53 2 57 21 46 234 -58 7 3 20 6 22 28 8 2 25 5 23 48 - 14 0 0 7 7 44 2 57 14 45 235 -57 7 28 12 6 47 18 8 27 20 5 48 35 - 13 0 0 7 32 42 2 57 8 44 235 -55 7 53 11 7 12 14 8 52 21 6 13 28 - 12 0 0 7 57 45 2 57 2 43 235 -54 8 18 15 7 37 17 9 17 28 6 38 28 - 11 0 0 8 22 54 2 56 56 42 236 -53 8 43 25 8 2 25 9 42 41 7 3 34 - 10 0 0 8 48 8 2 56 50 41 236 -52 9 8 40 8 27 38 10 7 58 7 28 45 - 9 0 0 9 13 26 2 56 44 40 236 -51 9 33 59 8 52 56 10 33 19 7 54 0 - 8 0 0 9 38 49 2 56 39 39 237 -50 9 59 22 9 18 17 10 58 44 8 19 20 - 7 0 0 10 4 14 2 56 33 38 237 -49 10 24 48 9 43 42 11 24 12 8 44 42 - 6 0 0 10 29 41 2 56 28 37 237 -48 10 50 16 10 9 9 11 49 42 9 10 8 - 5 0 0 10 55 11 2 56 22 36 238 -47 11 15 46 10 34 38 12 15 13 9 35 36 - 4 0 0 11 20 42 2 56 17 35 238 -46 11 41 18 11 0 9 12 40 46 10 1 5 - 3 0 0 11 46 14 2 56 12 34 238 -45 12 6 50 11 25 40 13 6 19 10 26 35 - 2 0 0 12 11 46 2 56 7 33 238 -44 12 32 22 11 51 12 13 31 52 10 52 6 - 1 0 0 12 37 17 2 56 3 32 239 -43 12 57 53 12 16 43 13 57 24 11 17 37 0 0 0 13 2 47 2 55 58 31 239 -42 13 23 24 12 42 13 14 22 55 11 43 6 1 0 0 13 28 16 2 55 54 30 239 -41 13 48 52 13 7 41 14 48 24 12 8 34 2 0 0 13 53 42 2 55 49 29 240 -40 14 14 19 13 33 7 15 13 50 12 34 1 3 0 0 14 19 5 2 55 45 27 240 -39 14 39 42 13 58 31 15 39 13 12 59 24 4 0 0 14 44 25 2 55 41 26 240 -38 15 5 1 14 23 50 16 4 32 13 24 44 5 0 0 15 9 41 2 55 37 25 241 -37 15 30 17 14 49 6 16 29 47 13 50 1 6 0 0 15 34 51 2 55 34 24 241 -36 15 55 27 15 14 17 16 54 57 14 15 12 7 0 0 15 59 57 2 55 30 23 241 -35 16 20 32 15 39 23 17 20 1 14 40 19 8 0 0 16 24 56 2 55 27 22 241 -34 16 45 31 16 4 23 17 44 59 15 5 20 9 0 0 16 49 49 2 55 24 21 242 -33 17 10 24 16 29 16 18 9 50 15 30 15 10 0 0 17 14 35 2 55 20 20 242 -31 17 35 9 16 54 3 18 34 34 15 55 3 11 0 0 17 39 14 2 55 18 19 242 -30 17 59 47 17 18 42 18 59 10 16 19 44 12 0 0 18 3 44 2 55 15 18 243 -29 18 24 16 17 43 13 19 23 37 16 44 17 13 0 0 18 28 5 2 55 12 17 243 -28 18 48 37 18 7 35 19 47 55 17 8 41 14 0 0 18 52 17 2 55 10 16 243 -27 19 12 48 18 31 47 20 12 4 17 32 56 15 0 0 19 16 19 2 55 7 15 244 -26 19 36 49 18 55 51 20 36 3 17 57 1 16 0 0 19 40 11 2 55 5 14 244 -25 20 0 40 19 19 43 20 59 51 18 20 57 17 0 0 20 3 52 2 55 3 13 244 -24 20 24 20 19 43 25 21 23 28 18 44 42 18 0 0 20 27 21 2 55 1 12 245 -23 20 47 49 20 6 56 21 46 53 19 8 16 19 0 0 20 50 39 2 55 0 11 245 -22 21 11 5 20 30 15 22 10 7 19 31 38 20 0 0 21 13 45 2 54 58 10 246 -21 21 34 10 20 53 21 22 33 7 19 54 48 21 0 0 21 36 37 2 54 57 9 246 -20 21 57 1 21 16 15 22 55 55 20 17 45 22 0 0 21 59 17 2 54 55 8 246 -19 22 19 39 21 38 56 23 18 29 20 40 30 23 0 0 22 21 42 2 54 54 7 247 -18 22 42 3 22 1 23 23 40 50 21 3 1 24 0 0 22 43 54 2 54 53 6 247 -17 23 4 14 22 23 36 24 2 56 21 25 18 25 0 0 23 5 51 2 54 52 5 247 -16 23 26 9 22 45 35 24 24 47 21 47 20 26 0 0 23 27 33 2 54 52 4 248 -15 23 47 50 23 7 18 24 46 23 22 9 8 27 0 0 23 49 0 2 54 51 3 248 -14 24 9 15 23 28 47 25 7 44 22 30 41 28 0 0 24 10 11 2 54 51 2 249 -14 24 30 25 23 50 0 25 28 49 22 51 58 29 0 0 24 31 7 2 54 51 1 249 -13 24 51 18 24 10 56 25 49 38 23 13 0 30 0 0 24 51 45 2 54 51 0 249 -12 25 11 55 24 31 37 .. .. .. 23 33 45 Uncertainty in time = +/- 7 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: UCAC2 24745401 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 33 12.1954 DE: -18 34 55.396 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .055, .057 ) * V mag [mag]: 11.4 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (718) Erida approx. diameter [km]: 68 approx. diameter ["]: .041 distance from Earth [AU]: 2.29900 * orbital information: orbit source: Preston date of fit: 2012 Aug 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1028 number of rejected observations: 87 time covered by the observations: 1902 Dec 24 - 2012 Aug 06 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.017, 65° remarks: * orbital elements for (718) Erida : Mean anomaly = 101.62792430 deg Arg. of pericenter = 174.90545283 deg Long. of node = 38.62599084 deg Inclination = 6.92920237 deg Eccentricity = 0.20090568 Semimajor axis = 3.05371972 AU Perihelion dist = 2.44021010 AU Mag: H = 9.45, G = 0.15 Epoch of elements : MJD 56176.12700000 TDT (2012 Sep 06.127) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 6 718 Erida 3h 2.6m UT 11.4 22 33 12.195-18 34 55.40UCAC2 24745401 0.0 14.4 68 5.1 2.299 -1.975 -7.19 -52.9606 -18.580 133.94 6.32 3.0431 -0.05109 0.19942 -7.34007 -1.88048 0.00064 0.00119 2000 100.4962842012 831.00000174.905453 38.625991 6.9292020.20090568 3.0537197 2.4402101 9.6 5.00.15 RATE 1.8469720 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.060 0.059 86 2.44 0.059 0 0 4 4 056165.0020120906_745401 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 25, 22:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org