IOTA/IOTA-ES occultation update for (164) Eva / 2UCAC 34118225 event on 2008 May 15, 23:30 UT Visible from Madagascar, Africa, Brazil, Argentina Summary ------- On 2008 May 15 UT, the 105 km diameter asteroid (164) Eva will occult a 13.0 mag star in the constellation Virgo for observers along a path across Madagascar, Africa, Brazil, Argentina. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.2 mag to 13.8 mag (the magnitude of the asteroid) for at most 6.4 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: 72 * date and approx. time of event: 2008 May 15, 23:26 - 2008 May 15, 23:37 UT * midpoint of event [JD]: 2454602.4804375 * magnitude of target star: 13.0 * magnitude drop [mag]: 1.2 * estimated maximum duration [s]: 6.4 * Moon: 85 % sunlit, 35° distance * Sun: 151° distance * rough path description: Madagascar, Africa, Brazil, Argentina The occultation path -------------------- * approximate projected width [km]: 119 * 1 sigma uncertainty interval [path widths]: +/- 0.80 * 1 sigma uncertainty interval [seconds]: +/- 5.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .054 +/- .051) * 1 sigma uncertainty ellipse (major, minor, PA): ( .054", .051", 94° ) * approx speed of asteroid's shadow [km/s]: 16.4318 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 34118225 by 164 Eva on 2008 May 15 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 - 93 0 0 -35 8 2 23 37 32 1 81 -5 -34 35 32 -35 40 43 .. .. .. -36 33 22 - 92 0 0 -35 0 34 23 37 32 2 80 -6 -34 28 2 -35 33 15 .. .. .. -36 25 55 - 91 0 0 -34 52 57 23 37 32 2 80 -6 -34 20 25 -35 25 40 -33 28 41 -36 18 21 - 90 0 0 -34 45 14 23 37 32 3 79 -7 -34 12 41 -35 17 57 -33 20 55 -36 10 39 - 89 0 0 -34 37 23 23 37 31 4 79 -8 -34 4 49 -35 10 7 -33 13 3 -36 2 50 - 88 0 0 -34 29 25 23 37 31 5 78 -8 -33 56 50 -35 2 9 -33 5 3 -35 54 54 - 87 0 0 -34 21 20 23 37 30 6 78 -9 -33 48 45 -34 54 5 -32 56 56 -35 46 51 - 86 0 0 -34 13 8 23 37 29 7 77 -10 -33 40 32 -34 45 54 -32 48 42 -35 38 41 - 85 0 0 -34 4 49 23 37 29 7 77 -11 -33 32 13 -34 37 36 -32 40 22 -35 30 24 - 84 0 0 -33 56 24 23 37 28 8 76 -12 -33 23 47 -34 29 11 -32 31 55 -35 22 1 - 83 0 0 -33 47 52 23 37 27 9 75 -12 -33 15 14 -34 20 40 -32 23 21 -35 13 31 - 82 0 0 -33 39 14 23 37 26 10 75 -13 -33 6 35 -34 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28 -20 1 41 64 0 0 -18 41 16 23 26 25 16 283 -37 -18 9 0 -19 13 42 -17 17 41 -20 5 57 65 0 0 -18 45 42 23 26 23 16 283 -36 -18 13 25 -19 18 8 -17 22 5 -20 10 24 66 0 0 -18 50 18 23 26 21 15 283 -35 -18 18 1 -19 22 45 -17 26 40 -20 15 2 67 0 0 -18 55 5 23 26 19 14 282 -34 -18 22 47 -19 27 33 -17 31 26 -20 19 50 68 0 0 -19 0 3 23 26 18 13 282 -33 -18 27 45 -19 32 32 -17 36 22 -20 24 50 69 0 0 -19 5 12 23 26 16 12 282 -32 -18 32 53 -19 37 41 -17 41 29 -20 30 0 70 0 0 -19 10 31 23 26 15 11 281 -31 -18 38 11 -19 43 1 -17 46 47 -20 35 21 71 0 0 -19 16 1 23 26 13 10 281 -30 -18 43 40 -19 48 31 -17 52 15 -20 40 52 72 0 0 -19 21 41 23 26 12 9 281 -30 -18 49 19 -19 54 11 -17 57 53 -20 46 34 73 0 0 -19 27 31 23 26 11 8 280 -29 -18 55 9 -20 0 2 -18 3 42 -20 52 26 74 0 0 -19 33 31 23 26 10 7 280 -28 -19 1 9 -20 6 3 -18 9 40 -20 58 28 75 0 0 -19 39 42 23 26 9 6 280 -27 -19 7 18 -20 12 15 -18 15 49 -21 4 40 76 0 0 -19 46 2 23 26 9 5 279 -26 -19 13 38 -20 18 36 -18 22 7 -21 11 3 77 0 0 -19 52 32 23 26 8 4 279 -25 -19 20 8 -20 25 7 -18 28 36 -21 17 35 78 0 0 -19 59 12 23 26 7 3 279 -24 -19 26 47 -20 31 47 -18 35 14 -21 24 17 79 0 0 -20 6 2 23 26 7 2 278 -23 -19 33 36 -20 38 38 .. .. .. -21 31 8 80 0 0 -20 13 1 23 26 7 1 278 -22 -19 40 34 -20 45 37 .. .. .. -21 38 9 81 0 0 -20 20 9 23 26 7 0 277 -21 -19 47 42 -20 52 46 .. .. .. -21 45 19 Uncertainty in time = +/- 5 secs [Prediction of 2008 Apr 18.0] Data for the target star ------------------------ * name: 2UCAC 34118225 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 38 01.4010 DE: +06 55 02.243 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .052, .050 ) * V mag [mag]: 13.0 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 219.6171641251 DE(deg): 6.8782263027 * Equation of equinoxes (radians) : 0.000039980492930 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (164) Eva approx. diameter [km]: 105 approx. diameter ["]: .064 distance from Earth [AU]: 2.26100 * orbital information: orbit source: Preston date of fit: 2008 Apr 18 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 722 number of rejected observations: 49 time covered by the observations: 1900 Mar 06 - 2008 Feb 10 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.014, 129° remarks: * orbital elements for (164) Eva : Mean anomaly = 248.51815057 deg Arg. of pericenter = 283.51173017 deg Long. of node = 77.14940521 deg Inclination = 24.48009776 deg Eccentricity = 0.34562774 Semimajor axis = 2.63158879 AU Perihelion dist = 1.72203870 AU Mag: H = 8.81, G = 0.15 Epoch of elements : MJD 54601.97900000 TDT (2008 May 15.979) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 15 164 Eva 23h 31.8m UT 13.0 14 38 1.401 6 55 2.242UCAC 34118225 0.0 13.8 105 6.4 2.261 -2.401 -4.69 -7.5123 6.918 -173.86 19.14 23.5305 0.06045 -0.46352 -9.19608 -1.20424 0.00128 -0.00248 2000 248.0612492008 514.00000283.511730 77.149405 24.4800980.34562774 2.6315888 1.7220387 8.9 5.00.15 RATE 2.3087510 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.054 0.051 94 1.80 0.051 0 54574.5020080515_118225 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 18, 17:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org