IOTA/IOTA-ES occultation update for (1171) Rusthawelia / 2UCAC 37657665 event on 2009 Dec 18, 07:42 UT Visible from S USA Summary ------- On 2009 Dec 18 UT, the 67 km diameter asteroid (1171) Rusthawelia will occult a 12.3 mag star in the constellation Taurus for observers along a path across S USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 13.7 mag (the magnitude of the asteroid) for at most 8.7 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: 56 * date and approx. time of event: 2009 Dec 18, 07:30 - 2009 Dec 18, 07:55 UT * magnitude of target star: 12.3 * magnitude drop [mag]: 1.7 * estimated maximum duration [s]: 8.7 * Moon: 3 % sunlit, 136° distance * Sun: 155° distance * rough path description: S USA The occultation path -------------------- * approximate projected width [km]: 71 * 1 sigma uncertainty interval [path widths]: +/- 1.12 * 1 sigma uncertainty interval [seconds]: +/- 10.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .069 +/- .061) * 1 sigma uncertainty ellipse (major, minor, PA): ( .069", .061", 87° ) * approx speed of asteroid's shadow [km/s]: 7.6585 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 37657665 by 1171 Rusthawelia on 2009 Dec 18 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 140 0 0 24 32 49 7 55 19 20 80 -1 24 53 2 24 12 38 25 38 30 23 27 36 141 0 0 24 50 5 7 55 13 21 80 -2 25 10 18 24 29 55 25 55 44 23 44 53 142 0 0 25 7 14 7 55 8 22 81 -3 25 27 26 24 47 4 26 12 51 24 2 4 143 0 0 25 24 15 7 55 3 23 81 -4 25 44 26 25 4 5 26 29 51 24 19 6 144 0 0 25 41 8 7 54 57 24 82 -5 26 1 19 25 20 59 26 46 43 24 36 1 145 0 0 25 57 53 7 54 51 25 82 -5 26 18 4 25 37 45 27 3 26 24 52 48 146 0 0 26 14 30 7 54 45 26 83 -6 26 34 41 25 54 23 27 20 1 25 9 27 147 0 0 26 30 59 7 54 39 27 83 -7 26 51 8 26 10 52 27 36 28 25 25 58 148 0 0 26 47 18 7 54 32 27 84 -8 27 7 27 26 27 12 27 52 45 25 42 19 149 0 0 27 3 29 7 54 26 28 84 -9 27 23 37 26 43 23 28 8 54 25 58 32 150 0 0 27 19 30 7 54 19 29 85 -10 27 39 38 26 59 25 28 24 53 26 14 35 151 0 0 27 35 22 7 54 12 30 86 -11 27 55 29 27 15 18 28 40 43 26 30 29 152 0 0 27 51 4 7 54 5 31 86 -12 28 11 11 27 31 1 28 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0 27 41 49 7 31 20 23 278 -47 28 1 56 27 21 45 28 47 10 26 36 57 - 65 0 0 27 25 54 7 31 15 22 279 -46 27 46 2 27 5 49 28 31 17 26 20 59 - 64 0 0 27 9 50 7 31 10 21 279 -45 27 29 58 26 49 44 28 15 15 26 4 52 - 63 0 0 26 53 35 7 31 5 20 280 -44 27 13 45 26 33 29 27 59 3 25 48 36 - 62 0 0 26 37 12 7 31 0 19 280 -43 26 57 22 26 17 5 27 42 41 25 32 10 - 61 0 0 26 20 39 7 30 56 18 280 -42 26 40 49 26 0 31 27 26 10 25 15 35 - 60 0 0 26 3 57 7 30 51 17 281 -42 26 24 8 25 43 49 27 9 31 24 58 52 - 59 0 0 25 47 7 7 30 47 16 281 -41 26 7 19 25 26 58 26 52 42 24 42 0 - 58 0 0 25 30 8 7 30 43 15 282 -40 25 50 21 25 9 59 26 35 46 24 24 59 - 57 0 0 25 13 2 7 30 40 14 282 -39 25 33 14 24 52 52 26 18 41 24 7 51 - 56 0 0 24 55 47 7 30 36 13 283 -38 25 16 0 24 35 37 26 1 28 23 50 34 - 55 0 0 24 38 25 7 30 33 12 283 -37 24 58 39 24 18 14 25 44 7 23 33 11 - 54 0 0 24 20 56 7 30 30 12 284 -36 24 41 10 24 0 45 25 26 39 23 15 40 - 53 0 0 24 3 20 7 30 27 11 284 -35 24 23 34 23 43 8 25 9 5 22 58 3 - 52 0 0 23 45 37 7 30 24 10 284 -34 24 5 52 23 25 25 24 51 23 22 40 19 - 51 0 0 23 27 48 7 30 22 9 285 -33 23 48 3 23 7 35 24 33 35 22 22 28 - 50 0 0 23 9 53 7 30 20 8 285 -32 23 30 9 22 49 40 24 15 42 22 4 32 - 49 0 0 22 51 52 7 30 18 7 286 -31 23 12 8 22 31 39 23 57 42 21 46 31 - 48 0 0 22 33 47 7 30 16 6 286 -30 22 54 3 22 13 33 23 39 37 21 28 24 - 47 0 0 22 15 36 7 30 15 5 286 -29 22 35 52 21 55 22 23 21 27 21 10 12 - 46 0 0 21 57 20 7 30 14 4 287 -28 22 17 37 21 37 6 23 3 12 20 51 56 - 45 0 0 21 39 1 7 30 13 3 287 -27 21 59 18 21 18 47 22 44 53 20 33 36 - 44 0 0 21 20 37 7 30 12 2 287 -26 21 40 54 21 0 23 22 26 30 20 15 12 - 43 0 0 21 2 10 7 30 12 1 288 -25 21 22 27 20 41 56 22 8 4 19 56 45 Uncertainty in time = +/- 11 secs Prediction of 2009 Dec 10.0 Data for the target star ------------------------ * name: 2UCAC 37657665 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 03 08.1903 DE: +16 55 26.136 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .061, .059 ) * V mag [mag]: 12.3 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1171) Rusthawelia approx. diameter [km]: 67 approx. diameter ["]: .055 distance from Earth [AU]: 1.66900 * orbital information: orbit source: Preston date of fit: 2009 Dec 10 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 977 number of rejected observations: 88 time covered by the observations: 1904 Mar 15 - 2009 Dec 03 1 sigma uncertainty ellipse (major, minor, PA): 0.033, 0.018, 78° remarks: * orbital elements for (1171) Rusthawelia : Mean anomaly = 13.89232625 deg Arg. of pericenter = 288.09098133 deg Long. of node = 122.24691439 deg Inclination = 3.07575710 deg Eccentricity = 0.19108738 Semimajor axis = 3.17703046 AU Perihelion dist = 2.56994002 AU Mag: H = 9.67, G = 0.15 Epoch of elements : MJD 55183.32100000 TDT (2009 Dec 18.321) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Dec 18 1171 Rusthawelia 7h 43.2m UT 12.3 4 3 8.190 16 55 26.142UCAC 37657665 0.0 13.7 67 8.7 1.669 -1.585 -0.52 -142.0738 16.925 63.35 -23.39 7.7199 -0.00681 0.34650 -4.32155 -0.09947 0.00233 0.00082 2000 13.31430920091215.00000288.090981122.246914 3.0757570.19108738 3.1770305 2.5699400 9.9 5.00.15 RATE 1.7404920 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.069 0.061 87 2.12 0.062 0 055175.0020091218_657665 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Dec 10, 09:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org