IOTA/IOTA-ES occultation update for (1112) Polonia / TYC 2435-00091-1 event on 2008 Dec 06, 20:55 UT Visible from Indonesia, India, Africa Summary ------- On 2008 Dec 06 UT, the 36 km diameter asteroid (1112) Polonia will occult a 12.7 mag star in the constellation Auriga for observers along a path across Indonesia, India, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.8 mag to 14.3 mag (the magnitude of the asteroid) for at most 3.4 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: 47 * date and approx. time of event: 2008 Dec 06, 20:46 - 2008 Dec 06, 21:04 UT * magnitude of target star: 12.7 * magnitude drop [mag]: 1.8 * estimated maximum duration [s]: 3.4 * Moon: 60 % sunlit, 101° distance * Sun: 156° distance * rough path description: Indonesia, India, Africa The occultation path -------------------- * approximate projected width [km]: 39 * 1 sigma uncertainty interval [path widths]: +/- 1.39 * 1 sigma uncertainty interval [seconds]: +/- 5.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .047 +/- .036) * 1 sigma uncertainty ellipse (major, minor, PA): ( .047", .036", 95° ) * approx speed of asteroid's shadow [km/s]: 10.4377 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2435-00091-1 by 1112 Polonia on 2008 Dec 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 - 8 0 0 -21 52 7 21 4 24 1 57 -24 -21 39 23 -22 4 53 .. .. .. -22 40 28 - 7 0 0 -21 15 36 21 4 24 2 56 -25 -21 2 53 -21 28 20 .. .. .. -22 3 53 - 6 0 0 -20 39 6 21 4 23 3 56 -27 -20 26 24 -20 51 49 -19 51 14 -21 27 19 - 5 0 0 -20 2 40 21 4 22 4 55 -28 -19 49 59 -20 15 22 -19 14 52 -20 50 48 - 4 0 0 -19 26 18 21 4 21 5 55 -29 -19 13 39 -19 38 59 -18 38 36 -20 14 21 - 3 0 0 -18 50 2 21 4 20 6 55 -30 -18 37 24 -19 2 41 -18 2 25 -19 37 59 - 2 0 0 -18 13 52 21 4 18 8 54 -31 -18 1 16 -18 26 30 -17 26 21 -19 1 44 - 1 0 0 -17 37 51 21 4 17 9 54 -32 -17 25 16 -17 50 27 -16 50 25 -18 25 36 0 0 0 -17 1 58 21 4 15 10 54 -33 -16 49 25 -17 14 33 -16 14 39 -17 49 38 1 0 0 -16 26 16 21 4 12 11 54 -34 -16 13 45 -16 38 49 -15 39 4 -17 13 49 2 0 0 -15 50 46 21 4 10 12 53 -35 -15 38 16 -16 3 17 -15 3 40 -16 38 12 3 0 0 -15 15 28 21 4 7 13 53 -36 -15 3 0 -15 27 57 -14 28 29 -16 2 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49 8 46 312 -27 3 44 36 3 22 34 4 15 9 2 51 49 109 0 0 3 16 27 20 49 0 45 311 -26 3 27 30 3 5 24 3 58 7 2 34 34 110 0 0 2 58 47 20 48 52 44 311 -25 3 9 51 2 47 42 3 40 33 2 16 48 111 0 0 2 40 34 20 48 44 43 311 -24 2 51 40 2 29 27 3 22 26 1 58 28 112 0 0 2 21 49 20 48 36 42 310 -23 2 32 57 2 10 40 3 3 48 1 39 36 113 0 0 2 2 32 20 48 28 41 310 -22 2 13 41 1 51 21 2 44 37 1 20 12 114 0 0 1 42 42 20 48 20 40 310 -21 1 53 54 1 31 30 2 24 55 1 0 15 115 0 0 1 22 21 20 48 12 40 310 -20 1 33 34 1 11 6 2 4 41 0 39 46 116 0 0 1 1 27 20 48 5 39 309 -19 1 12 42 0 50 11 1 43 54 0 18 45 117 0 0 0 40 2 20 47 57 38 309 -18 0 51 19 0 28 43 1 22 36 - 0 2 48 118 0 0 0 18 4 20 47 50 37 309 -17 0 29 24 0 6 44 1 0 47 - 0 24 53 119 0 0 - 0 4 25 20 47 43 36 309 -16 0 6 57 - 0 15 47 0 38 26 - 0 47 30 120 0 0 - 0 27 25 20 47 36 35 308 -15 - 0 16 2 - 0 38 50 0 15 33 - 1 10 38 121 0 0 - 0 50 57 20 47 29 34 308 -13 - 0 39 31 - 1 2 24 - 0 7 51 - 1 34 18 122 0 0 - 1 15 0 20 47 23 33 308 -12 - 1 3 32 - 1 26 29 - 0 31 46 - 1 58 29 123 0 0 - 1 39 34 20 47 16 32 308 -11 - 1 28 4 - 1 51 5 - 0 56 11 - 2 23 12 124 0 0 - 2 4 38 20 47 10 31 308 -10 - 1 53 6 - 2 16 12 - 1 21 8 - 2 48 25 125 0 0 - 2 30 13 20 47 4 30 307 -9 - 2 18 39 - 2 41 49 - 1 46 34 - 3 14 8 126 0 0 - 2 56 19 20 46 58 28 307 -8 - 2 44 42 - 3 7 57 - 2 12 31 - 3 40 22 127 0 0 - 3 22 54 20 46 52 27 307 -7 - 3 11 15 - 3 34 34 - 2 38 58 - 4 7 6 128 0 0 - 3 49 59 20 46 46 26 307 -6 - 3 38 17 - 4 1 41 - 3 5 54 - 4 34 20 129 0 0 - 4 17 33 20 46 41 25 307 -5 - 4 5 49 - 4 29 18 - 3 33 19 - 5 2 3 130 0 0 - 4 45 36 20 46 36 24 307 -4 - 4 33 50 - 4 57 23 - 4 1 13 - 5 30 15 131 0 0 - 5 14 7 20 46 31 23 306 -3 - 5 2 19 - 5 25 57 - 4 29 36 - 5 58 55 132 0 0 - 5 43 7 20 46 26 22 306 -2 - 5 31 16 - 5 54 58 - 4 58 26 - 6 28 4 133 0 0 - 6 12 34 20 46 21 21 306 -1 - 6 0 41 - 6 24 28 - 5 27 45 - 6 57 40 Uncertainty in time = +/- 6 secs [Prediction of 2008 Nov 26.0] Data for the target star ------------------------ * name: TYC 2435-00091-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 37 18.3476 DE: +30 26 46.031 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .036, .029 ) * V mag [mag]: 12.7 * B mag [mag]: 13.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1112) Polonia approx. diameter [km]: 36 approx. diameter ["]: .026 distance from Earth [AU]: 1.91900 * orbital information: orbit source: Preston date of fit: 2008 Nov 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 783 number of rejected observations: 45 time covered by the observations: 1928 Aug 15 - 2008 Nov 12 1 sigma uncertainty ellipse (major, minor, PA): 0.031, 0.022, 102° remarks: * orbital elements for (1112) Polonia : Mean anomaly = 50.36397036 deg Arg. of pericenter = 86.84242377 deg Long. of node = 302.98396845 deg Inclination = 8.99668004 deg Eccentricity = 0.10204282 Semimajor axis = 3.02211234 AU Perihelion dist = 2.71372747 AU Mag: H = 9.87, G = 0.15 Epoch of elements : MJD 54806.87200000 TDT (2008 Dec 06.872) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Dec 6 1112 Polonia 20h 55.0m UT 12.7 6 37 18.348 30 26 46.03TYC 2435-00091-1 13.1 14.3 36 3.4 1.919 -2.086 -1.56 69.5629 30.446 -135.91 -22.61 20.9168 0.02233 -0.38487 -5.88152 -0.33942 -0.00234 -0.00054 2000 49.07476720081130.00000 86.842424302.983968 8.9966800.10204282 3.0221123 2.713727510.1 5.00.15 RATE 1.8760230 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.047 0.036 95 2.39 0.036 0 54796.5020081206_0091-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 26, 23:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org