IOTA/IOTA-ES occultation update for (1988) Delores / TYC 4676-00114-1 event on 2012 Nov 15, 05:52 UT Visible from Argentina, Chile Summary ------- On 2012 Nov 15 UT, the 23 km diameter asteroid (1988) Delores will occult a 9.9 mag star in the constellation Cetus for observers along a path across Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.5 mag to 16.4 mag (the magnitude of the asteroid) for at most 10.3 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: 31 * date and approx. time of event: 2012 Nov 15, 05:05 - 2012 Nov 15, 06:39 UT * geocentric midpoint of event [JD]: 2456246.74489167 * magnitude of target star: 9.9 * magnitude drop [mag]: 6.5 * estimated maximum duration [s]: 10.3 * Moon: 2 % sunlit, 119° distance * Sun: 136° distance * rough path description: Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 2.19 * 1 sigma uncertainty interval [seconds]: +/- 18.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .060 +/- .047) * 1 sigma uncertainty ellipse (major, minor, PA): ( .061", .045", 71° ) * approx speed of asteroid's shadow [km/s]: 2.2357 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4676-00114-1 by 1988 Delores on 2012 Nov 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 ' " Longitude Longitude Longitude Longitude Latitude Latitude Latitude Latitude 147 0 0 45 23 26 6 39 11 12 106 0 45 29 52 45 16 59 45 58 6 44 48 45 148 0 0 45 11 22 6 39 3 12 106 -1 45 17 50 45 4 54 45 46 10 44 36 35 149 0 0 44 58 45 6 38 55 13 107 -1 45 5 15 44 52 16 45 33 40 44 23 51 150 0 0 44 45 34 6 38 47 14 108 -2 44 52 5 44 39 3 45 20 36 44 10 32 151 0 0 44 31 48 6 38 38 15 108 -2 44 38 20 44 25 16 45 6 58 43 56 38 152 0 0 44 17 27 6 38 29 15 109 -3 44 24 1 44 10 54 44 52 45 43 42 10 153 0 0 44 2 31 6 38 19 16 110 -3 44 9 7 43 55 56 44 37 58 43 27 6 154 0 0 43 47 0 6 38 9 17 110 -4 43 53 37 43 40 24 44 22 35 43 11 26 155 0 0 43 30 54 6 37 58 17 111 -5 43 37 32 43 24 15 44 6 37 42 55 11 156 0 0 43 14 11 6 37 47 18 112 -5 43 20 51 43 7 31 43 50 3 42 38 20 157 0 0 42 56 52 6 37 35 19 112 -6 43 3 34 42 50 11 43 32 53 42 20 52 158 0 0 42 38 57 6 37 22 20 113 -6 42 45 40 42 32 14 43 15 7 42 2 48 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-49 19 23 -48 39 38 -49 46 41 - 37 0 0 -49 16 19 5 5 37 7 274 -12 -49 10 5 -49 22 32 -48 42 50 -49 49 49 - 36 0 0 -49 18 59 5 5 34 7 274 -12 -49 12 46 -49 25 12 -48 45 32 -49 52 27 - 35 0 0 -49 21 10 5 5 30 6 273 -11 -49 14 57 -49 27 23 -48 47 44 -49 54 36 - 34 0 0 -49 22 51 5 5 27 5 272 -11 -49 16 38 -49 29 3 -48 49 26 -49 56 16 - 33 0 0 -49 24 2 5 5 24 5 271 -10 -49 17 50 -49 30 15 -48 50 38 -49 57 26 - 32 0 0 -49 24 44 5 5 22 4 271 -10 -49 18 31 -49 30 56 -48 51 20 -49 58 7 - 31 0 0 -49 24 55 5 5 20 3 270 -9 -49 18 43 -49 31 8 -48 51 32 -49 58 19 - 30 0 0 -49 24 37 5 5 18 3 269 -9 -49 18 24 -49 30 49 -48 51 14 -49 58 0 - 29 0 0 -49 23 48 5 5 17 2 268 -8 -49 17 36 -49 30 1 -48 50 25 -49 57 12 - 28 0 0 -49 22 29 5 5 16 1 268 -8 -49 16 17 -49 28 42 -48 49 5 -49 55 54 - 27 0 0 -49 20 40 5 5 15 1 267 -8 -49 14 27 -49 26 53 -48 47 14 -49 54 6 - 26 0 0 -49 18 20 5 5 15 0 266 -7 -49 12 7 -49 24 33 -48 44 53 -49 51 47 Uncertainty in time = +/- 23 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: TYC 4676-00114-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 48 02.8932 DE: -02 35 25.564 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .024 ) * V mag [mag]: 9.9 * B mag [mag]: 10.8 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1988) Delores approx. diameter [km]: 23 approx. diameter ["]: .027 distance from Earth [AU]: 1.15800 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1099 number of rejected observations: 32 time covered by the observations: 1952 Sep 28 - 2012 Oct 25 1 sigma uncertainty ellipse (major, minor, PA): 0.058, 0.038, 69° remarks: * orbital elements for (1988) Delores : Mean anomaly = 39.94622732 deg Arg. of pericenter = 235.18321623 deg Long. of node = 106.40810200 deg Inclination = 4.25154013 deg Eccentricity = 0.10208707 Semimajor axis = 2.15385060 AU Perihelion dist = 1.93397029 AU Mag: H = 13.47, G = 0.15 Epoch of elements : MJD 56246.24500000 TDT (2012 Nov 15.245) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 15 1988 Delores 5h 52.6m UT 9.9 0 48 2.893- 2 35 25.56TYC 4676-00114-1 10.8 16.4 23 10.3 1.158 -0.424 7.15 -130.8749 -2.592 88.00 -18.59 5.8774 -0.01360 -0.01309 -0.84069 0.94107 0.00324 0.00191 2000 37.999015201211 9.00000235.183216106.408102 4.2515400.10208707 2.1538506 1.933970313.6 5.00.15 RATE 3.1180330 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.061 0.045 71 3.19 0.060 0 0 2-4 056226.0020121115_0114-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 22:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org