IOTA/IOTA-ES occultation update for (1128) Astrid / TYC 0280-00587-1 event on 2012 Nov 12, 09:37 UT Visible from Colombia Summary ------- On 2012 Nov 12 UT, the 42 km diameter asteroid (1128) Astrid will occult a 10.0 mag star in the constellation Virgo for observers along a path across Colombia. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.5 mag to 16.5 mag (the magnitude of the asteroid) for at most 1.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 44 * date and approx. time of event: 2012 Nov 12, 09:34 - 2012 Nov 12, 09:35 UT * geocentric midpoint of event [JD]: 2456243.90088333 * magnitude of target star: 10.0 * magnitude drop [mag]: 6.5 * estimated maximum duration [s]: 1.2 * Moon: 4 % sunlit, 28° distance * Sun: 49° distance * rough path description: Colombia The occultation path -------------------- * approximate projected width [km]: 44 * 1 sigma uncertainty interval [path widths]: +/- 1.47 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .025", 99° ) * approx speed of asteroid's shadow [km/s]: 36.2184 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0280-00587-1 by 1128 Astrid on 2012 Nov 12 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 -104 0 0 7 45 15 9 34 27 0 90 -46 7 33 26 7 57 4 6 58 36 8 31 43 -103 0 0 7 45 16 9 34 27 1 90 -45 7 33 27 7 57 5 6 58 37 8 31 44 -102 0 0 7 44 51 9 34 27 2 90 -45 7 33 2 7 56 40 6 58 12 8 31 20 -101 0 0 7 44 1 9 34 27 3 90 -44 7 32 11 7 55 50 6 57 21 8 30 30 -100 0 0 7 42 45 9 34 27 4 90 -43 7 30 55 7 54 34 6 56 5 8 29 15 - 99 0 0 7 41 4 9 34 28 5 90 -42 7 29 14 7 52 53 6 54 23 8 27 34 - 98 0 0 7 38 57 9 34 28 6 91 -41 7 27 7 7 50 46 6 52 15 8 25 27 - 97 0 0 7 36 24 9 34 28 7 91 -40 7 24 34 7 48 13 6 49 41 8 22 56 - 96 0 0 7 33 25 9 34 29 8 91 -39 7 21 35 7 45 15 6 46 42 8 19 58 - 95 0 0 7 30 1 9 34 29 9 91 -38 7 18 11 7 41 52 6 43 17 8 16 36 - 94 0 0 7 26 12 9 34 30 10 91 -37 7 14 21 7 38 2 6 39 26 8 12 47 - 93 0 0 7 21 57 9 34 30 11 91 -36 7 10 5 7 33 47 6 35 9 8 8 33 - 92 0 0 7 17 16 9 34 31 12 91 -35 7 5 24 7 29 7 6 30 26 8 3 54 - 91 0 0 7 12 9 9 34 32 13 91 -34 7 0 17 7 24 1 6 25 18 7 58 50 - 90 0 0 7 6 37 9 34 32 14 91 -33 6 54 44 7 18 29 6 19 44 7 53 19 - 89 0 0 7 0 40 9 34 33 15 92 -32 6 48 46 7 12 32 6 13 45 7 47 24 - 88 0 0 6 54 17 9 34 34 16 92 -31 6 42 23 7 6 10 6 7 19 7 41 3 - 87 0 0 6 47 28 9 34 35 17 92 -30 6 35 33 6 59 22 6 0 28 7 34 17 - 86 0 0 6 40 14 9 34 36 18 92 -29 6 28 19 6 52 8 5 53 12 7 27 5 - 85 0 0 6 32 34 9 34 37 19 92 -28 6 20 39 6 44 30 5 45 30 7 19 28 - 84 0 0 6 24 30 9 34 38 20 92 -27 6 12 33 6 36 25 5 37 22 7 11 26 - 83 0 0 6 15 59 9 34 39 21 92 -26 6 4 2 6 27 56 5 28 49 7 2 58 - 82 0 0 6 7 4 9 34 40 22 92 -25 5 55 6 6 19 1 5 19 51 6 54 6 - 81 0 0 5 57 43 9 34 42 23 92 -24 5 45 44 6 9 41 5 10 27 6 44 48 - 80 0 0 5 47 57 9 34 43 24 92 -23 5 35 58 5 59 56 5 0 38 6 35 6 - 79 0 0 5 37 46 9 34 44 25 92 -22 5 25 46 5 49 46 4 50 24 6 24 58 - 78 0 0 5 27 10 9 34 46 26 92 -21 5 15 9 5 39 11 4 39 44 6 14 25 - 77 0 0 5 16 9 9 34 47 27 92 -20 5 4 7 5 28 11 4 28 40 6 3 28 - 76 0 0 5 4 44 9 34 49 28 92 -19 4 52 41 5 16 46 4 17 10 5 52 6 - 75 0 0 4 52 53 9 34 50 29 92 -18 4 40 49 5 4 56 4 5 16 5 40 19 - 74 0 0 4 40 38 9 34 52 30 92 -17 4 28 33 4 52 42 3 52 57 5 28 8 - 73 0 0 4 27 58 9 34 54 31 92 -16 4 15 52 4 40 4 3 40 14 5 15 32 - 72 0 0 4 14 54 9 34 55 32 92 -15 4 2 47 4 27 1 3 27 5 5 2 32 - 71 0 0 4 1 26 9 34 57 33 92 -14 3 49 18 4 13 33 3 13 33 4 49 8 - 70 0 0 3 47 34 9 34 59 34 92 -13 3 35 24 3 59 42 2 59 36 4 35 19 - 69 0 0 3 33 17 9 35 1 35 92 -12 3 21 7 3 45 27 2 45 16 4 21 7 - 68 0 0 3 18 37 9 35 3 36 92 -11 3 6 26 3 30 48 2 30 31 4 6 31 - 67 0 0 3 3 33 9 35 5 37 92 -10 2 51 21 3 15 45 2 15 23 3 51 32 - 66 0 0 2 48 6 9 35 7 38 92 -9 2 35 52 3 0 19 1 59 51 3 36 9 - 65 0 0 2 32 15 9 35 9 39 92 -8 2 20 0 2 44 29 1 43 56 3 20 23 - 64 0 0 2 16 1 9 35 11 40 92 -7 2 3 45 2 28 17 1 27 37 3 4 14 - 63 0 0 1 59 25 9 35 13 41 91 -6 1 47 8 2 11 41 1 10 56 2 47 42 - 62 0 0 1 42 26 9 35 15 42 91 -5 1 30 7 1 54 43 0 53 52 2 30 47 - 61 0 0 1 25 4 9 35 18 43 91 -4 1 12 45 1 37 23 0 36 26 2 13 30 - 60 0 0 1 7 20 9 35 20 44 91 -2 0 55 0 1 19 40 0 18 37 1 55 52 - 59 0 0 0 49 15 9 35 22 45 90 -1 0 36 53 1 1 36 0 0 27 1 37 51 - 58 0 0 0 30 48 9 35 25 46 90 0 0 18 25 0 43 10 - 0 18 5 1 19 28 Uncertainty in time = +/- 2 secs Prediction of 2012 Jul 10.0 Data for the target star ------------------------ * name: TYC 0280-00587-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 04 39.7230 DE: +00 23 14.102 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .022 ) * V mag [mag]: 10.0 * B mag [mag]: 11.5 * Apparent position with proper motion RA(deg): 181.3301760669 DE(deg): 0.3156754480 * Equation of equinoxes (radians) : 0.000056891196220 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1128) Astrid approx. diameter [km]: 42 approx. diameter ["]: .017 distance from Earth [AU]: 3.41200 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1401 number of rejected observations: 115 time covered by the observations: 1920 May 10 - 2012 May 09 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.011, 114° remarks: * orbital elements for (1128) Astrid : Mean anomaly = 234.29921151 deg Arg. of pericenter = 236.23051816 deg Long. of node = 59.40567859 deg Inclination = 1.01487797 deg Eccentricity = 0.04674318 Semimajor axis = 2.78614428 AU Perihelion dist = 2.65591102 AU Mag: H = 10.76, G = 0.15 Epoch of elements : MJD 56243.40100000 TDT (2012 Nov 12.401) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 12 1128 Astrid 9h 37.3m UT 10.0 12 4 39.723 0 23 14.10TYC 0280-00587-1 11.5 16.5 42 1.2 3.412 3.230 -20.72 -15.0751 0.393 31.74 -17.85 9.6212 -0.10641 -0.24426 18.79597 -8.03831 -0.00410 0.00184 2000 233.578428201211 9.00000236.230518 59.405679 1.0148780.04674318 2.7861443 2.655911010.7 5.00.15 RATE 2.1193300 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.025 99 2.47 0.025 0 0 0 2 056118.0020121112_0587-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 25, 19:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org