IOTA/IOTA-ES occultation update for (636) Erika / TYC 7386-00178-1 event on 2008 Jul 01, 03:57 UT Visible from Brazil, Bolivia, Peru Summary ------- On 2008 Jul 01 UT, the 74 km diameter asteroid (636) Erika will occult a 10.7 mag star in the constellation Scorpius for observers along a path across Brazil, Bolivia, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.5 mag to 13.1 mag (the magnitude of the asteroid) for at most 7.6 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 94 * date and approx. time of event: 2008 Jul 01, 03:48 - 2008 Jul 01, 04:08 UT * magnitude of target star: 10.7 * magnitude drop [mag]: 2.5 * estimated maximum duration [s]: 7.6 * Moon: 6 % sunlit, 162° distance * Sun: 164° distance * rough path description: Brazil, Bolivia, Peru The occultation path -------------------- * approximate projected width [km]: 80 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 4.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .049 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .049", .029", 94° ) * approx speed of asteroid's shadow [km/s]: 9.7898 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7386-00178-1 by 636 Erika on 2008 Jul 1 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 -146 0 0 11 4 20 4 8 13 8 127 0 11 30 53 10 37 52 11 55 26 10 13 38 -145 0 0 10 24 42 4 8 11 9 128 -1 10 51 9 9 58 21 11 15 36 9 34 13 -144 0 0 9 45 31 4 8 8 10 128 -3 10 11 51 9 19 16 10 36 11 8 55 13 -143 0 0 9 6 46 4 8 6 11 128 -4 9 33 0 8 40 38 9 57 14 8 16 42 -142 0 0 8 28 30 4 8 3 12 128 -5 8 54 37 8 2 29 9 18 45 7 38 38 -141 0 0 7 50 42 4 7 59 14 128 -6 8 16 43 7 24 48 8 40 44 7 1 3 -140 0 0 7 13 24 4 7 56 15 128 -7 7 39 18 6 47 37 8 3 13 6 23 58 -139 0 0 6 36 37 4 7 52 16 129 -8 7 2 24 6 10 56 7 26 13 5 47 24 -138 0 0 6 0 22 4 7 48 17 129 -9 6 26 2 5 34 47 6 49 44 5 11 21 -137 0 0 5 24 38 4 7 44 18 129 -11 5 50 11 4 59 10 6 13 47 4 35 50 -136 0 0 4 49 27 4 7 39 19 129 -12 5 14 54 4 24 6 5 38 23 4 0 52 -135 0 0 4 14 49 4 7 35 20 129 -13 4 40 9 3 49 35 5 3 33 3 26 27 -134 0 0 3 40 46 4 7 30 22 129 -14 4 5 59 3 15 38 4 29 16 2 52 36 -133 0 0 3 7 16 4 7 25 23 129 -15 3 32 23 2 42 15 3 55 34 2 19 19 -132 0 0 2 34 22 4 7 19 24 130 -16 2 59 22 2 9 27 3 22 26 1 46 37 -131 0 0 2 2 2 4 7 13 25 130 -17 2 26 56 1 37 14 2 49 54 1 14 30 -130 0 0 1 30 19 4 7 8 26 130 -18 1 55 6 1 5 37 2 17 58 0 42 59 -129 0 0 0 59 11 4 7 2 27 130 -20 1 23 51 0 34 36 1 46 38 0 12 3 -128 0 0 0 28 40 4 6 55 28 130 -21 0 53 14 0 4 11 1 15 54 - 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9 44 19 -10 28 38 - 9 23 51 -10 48 57 - 58 0 0 - 9 55 1 3 55 44 63 203 -77 - 9 32 47 -10 17 12 - 9 12 17 -10 37 32 - 57 0 0 - 9 42 56 3 55 33 62 204 -77 - 9 20 39 -10 5 9 - 9 0 6 -10 25 32 - 56 0 0 - 9 30 15 3 55 22 62 206 -76 - 9 7 55 - 9 52 31 - 8 47 20 -10 12 57 - 55 0 0 - 9 16 58 3 55 12 61 207 -76 - 8 54 36 - 9 39 17 - 8 33 57 - 9 59 46 - 54 0 0 - 9 3 5 3 55 2 61 208 -75 - 8 40 40 - 9 25 27 - 8 19 58 - 9 45 59 - 53 0 0 - 8 48 36 3 54 51 60 209 -75 - 8 26 7 - 9 11 2 - 8 5 23 - 9 31 36 - 52 0 0 - 8 33 31 3 54 41 59 210 -74 - 8 10 59 - 8 56 0 - 7 50 11 - 9 16 37 - 51 0 0 - 8 17 50 3 54 30 59 211 -74 - 7 55 14 - 8 40 22 - 7 34 23 - 9 1 3 - 50 0 0 - 8 1 32 3 54 20 58 212 -73 - 7 38 52 - 8 24 8 - 7 17 58 - 8 44 52 - 49 0 0 - 7 44 38 3 54 10 57 213 -73 - 7 21 54 - 8 7 17 - 7 0 56 - 8 28 5 - 48 0 0 - 7 27 7 3 53 59 56 214 -72 - 7 4 20 - 7 49 51 - 6 43 18 - 8 10 41 - 47 0 0 - 7 9 0 3 53 49 55 215 -71 - 6 46 8 - 7 31 47 - 6 25 3 - 7 52 42 - 46 0 0 - 6 50 16 3 53 39 55 215 -70 - 6 27 20 - 7 13 7 - 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17 0 0 6 36 50 3 49 32 26 226 -41 7 2 32 6 11 14 7 26 16 5 47 46 - 16 0 0 7 13 15 3 49 26 25 227 -40 7 39 4 6 47 33 8 2 54 6 23 59 - 15 0 0 7 50 11 3 49 20 24 227 -39 8 16 6 7 24 22 8 40 2 7 0 42 - 14 0 0 8 27 35 3 49 14 23 227 -38 8 53 36 8 1 39 9 17 38 7 37 54 - 13 0 0 9 5 27 3 49 9 22 227 -37 9 31 35 8 39 25 9 55 43 8 15 34 - 12 0 0 9 43 46 3 49 4 21 227 -36 10 10 1 9 17 38 10 34 15 8 53 41 - 11 0 0 10 22 32 3 48 59 19 228 -35 10 48 53 9 56 18 11 13 13 9 32 15 - 10 0 0 11 1 43 3 48 54 18 228 -33 11 28 10 10 35 22 11 52 36 10 11 14 - 9 0 0 11 41 18 3 48 50 17 228 -32 12 7 52 11 14 51 12 32 24 10 50 37 - 8 0 0 12 21 17 3 48 46 16 228 -31 12 47 56 11 54 44 13 12 34 11 30 24 - 7 0 0 13 1 37 3 48 42 15 229 -30 13 28 23 12 34 58 13 53 6 12 10 33 - 6 0 0 13 42 18 3 48 38 14 229 -29 14 9 10 13 15 33 14 33 58 12 51 2 - 5 0 0 14 23 18 3 48 35 12 229 -28 14 50 16 13 56 28 15 15 10 13 31 52 - 4 0 0 15 4 37 3 48 32 11 229 -26 15 31 40 14 37 41 15 56 40 14 13 0 - 3 0 0 15 46 13 3 48 29 10 230 -25 16 13 21 15 19 11 16 38 26 14 54 25 - 2 0 0 16 28 3 3 48 27 9 230 -24 16 55 17 16 0 57 17 20 27 15 36 6 - 1 0 0 17 10 8 3 48 25 8 230 -23 17 37 27 16 42 56 18 2 42 16 18 1 0 0 0 17 52 25 3 48 23 7 231 -22 18 19 49 17 25 8 18 45 8 17 0 9 1 0 0 18 34 53 3 48 22 5 231 -20 19 2 22 18 7 32 19 27 45 17 42 28 2 0 0 19 17 30 3 48 20 4 231 -19 19 45 4 18 50 5 20 10 31 18 24 57 3 0 0 20 0 15 3 48 19 3 232 -18 20 27 53 19 32 45 20 53 24 19 7 33 4 0 0 20 43 6 3 48 19 2 232 -17 21 10 47 20 15 32 21 36 23 19 50 17 5 0 0 21 26 1 3 48 18 1 232 -16 21 53 46 20 58 23 22 19 25 20 33 5 Uncertainty in time = +/- 6 secs [Prediction of 2008 Jun 19.0] Data for the target star ------------------------ * name: TYC 7386-00178-1 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 51 52.0376 DE: -34 23 32.008 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .035, .022 ) * V mag [mag]: 10.7 * B mag [mag]: 10.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (636) Erika approx. diameter [km]: 74 approx. diameter ["]: .064 distance from Earth [AU]: 1.59600 * orbital information: orbit source: Preston date of fit: 2008 Jun 18 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 894 number of rejected observations: 54 time covered by the observations: 1907 Mar 03 - 2008 Jun 15 1 sigma uncertainty ellipse (major, minor, PA): 0.035, 0.019, 97° remarks: * orbital elements for (636) Erika : Mean anomaly = 316.71140927 deg Arg. of pericenter = 297.63618111 deg Long. of node = 34.76746801 deg Inclination = 7.92780574 deg Eccentricity = 0.17524050 Semimajor axis = 2.91008881 AU Perihelion dist = 2.40012338 AU Mag: H = 9.54, G = 0.15 Epoch of elements : MJD 54648.16500000 TDT (2008 Jul 01.165) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 1 636 Erika 3h 58.3m UT 10.7 17 51 52.038-34 23 32.01TYC 7386-00178-1 10.7 13.1 74 7.6 1.596 -2.453 -2.06 -71.1942 -34.391 121.39 23.09 3.9719 -0.02634 0.38621 -5.51289 -0.37488 0.00108 0.00101 2000 315.0903422008 623.00000297.636181 34.767468 7.9278060.17524050 2.9100888 2.4001234 9.5 5.00.15 RATE 1.9853850 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.049 0.029 94 1.46 0.029 0 54636.5020080701_0178-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jun 19, 01:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org