IOTA/IOTA-ES occultation update for (477) Italia / TYC 1926-00046-1 event on 2008 May 13, 23:36 UT Visible from Brazil, Colombia Summary ------- On 2008 May 13 UT, the 23 km diameter asteroid (477) Italia will occult a 9.4 mag star in the constellation Cancer for observers along a path across Brazil, Colombia. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.6 mag to 16.0 mag (the magnitude of the asteroid) for at most 0.8 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: 21 * date and approx. time of event: 2008 May 13, 23:38 - 2008 May 13, 23:40 UT * midpoint of event [JD]: 2454600.48365417 * magnitude of target star: 9.4 * magnitude drop [mag]: 6.6 * estimated maximum duration [s]: 0.8 * Moon: 68 % sunlit, 47° distance * Sun: 65° distance * rough path description: Brazil, Colombia The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 3.21 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .024 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .032", .024", 2° ) * approx speed of asteroid's shadow [km/s]: 27.8891 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1926-00046-1 by 477 Italia on 2008 May 13 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 - 82 0 0 7 16 54 23 38 12 62 310 -1 7 9 56 7 23 52 6 25 7 8 8 34 - 81 0 0 6 48 12 23 38 16 61 309 -2 6 41 13 6 55 11 5 56 18 7 39 59 - 80 0 0 6 19 7 23 38 20 60 309 -3 6 12 7 6 26 7 5 27 6 7 11 1 - 79 0 0 5 49 40 23 38 24 58 309 -4 5 42 39 5 56 41 4 57 32 6 41 41 - 78 0 0 5 19 51 23 38 27 57 308 -5 5 12 49 5 26 53 4 27 36 6 11 59 - 77 0 0 4 49 42 23 38 31 56 308 -7 4 42 39 4 56 44 3 57 20 5 41 56 - 76 0 0 4 19 12 23 38 35 55 308 -8 4 12 8 4 26 15 3 26 43 5 11 33 - 75 0 0 3 48 22 23 38 39 54 308 -9 3 41 17 3 55 27 2 55 47 4 40 50 - 74 0 0 3 17 14 23 38 42 53 308 -10 3 10 8 3 24 19 2 24 33 4 9 47 - 73 0 0 2 45 48 23 38 46 52 307 -11 2 38 41 2 52 54 1 53 1 3 38 27 - 72 0 0 2 14 4 23 38 50 51 307 -12 2 6 57 2 21 11 1 21 12 3 6 50 - 71 0 0 1 42 5 23 38 53 50 307 -13 1 34 57 1 49 12 0 49 7 2 34 55 - 70 0 0 1 9 50 23 38 57 48 307 -14 1 2 41 1 16 58 0 16 46 2 2 46 - 69 0 0 0 37 20 23 39 0 47 307 -16 0 30 11 0 44 29 - 0 15 48 1 30 21 - 68 0 0 0 4 37 23 39 3 46 306 -17 - 0 2 33 0 11 47 - 0 48 36 0 57 43 - 67 0 0 - 0 28 19 23 39 7 45 306 -18 - 0 35 30 - 0 21 9 - 1 21 37 0 24 51 - 66 0 0 - 1 1 27 23 39 10 44 306 -19 - 1 8 38 - 0 54 16 - 1 54 49 - 0 8 12 - 65 0 0 - 1 34 45 23 39 13 43 306 -20 - 1 41 57 - 1 27 34 - 2 28 11 - 0 41 27 - 64 0 0 - 2 8 14 23 39 16 42 306 -21 - 2 15 26 - 2 1 2 - 3 1 43 - 1 14 51 - 63 0 0 - 2 41 51 23 39 19 40 306 -22 - 2 49 3 - 2 34 38 - 3 35 23 - 1 48 25 - 62 0 0 - 3 15 35 23 39 22 39 305 -24 - 3 22 48 - 3 8 23 - 4 9 11 - 2 22 7 - 61 0 0 - 3 49 27 23 39 25 38 305 -25 - 3 56 40 - 3 42 14 - 4 43 6 - 2 55 56 - 60 0 0 - 4 23 24 23 39 28 37 305 -26 - 4 30 38 - 4 16 11 - 5 17 5 - 3 29 50 - 59 0 0 - 4 57 26 23 39 31 36 305 -27 - 5 4 40 - 4 50 12 - 5 51 9 - 4 3 50 - 58 0 0 - 5 31 31 23 39 34 35 305 -28 - 5 38 46 - 5 24 17 - 6 25 17 - 4 37 54 - 57 0 0 - 6 5 39 23 39 36 33 305 -29 - 6 12 54 - 5 58 25 - 6 59 26 - 5 12 0 - 56 0 0 - 6 39 49 23 39 39 32 304 -30 - 6 47 3 - 6 32 34 - 7 33 37 - 5 46 9 - 55 0 0 - 7 13 59 23 39 41 31 304 -31 - 7 21 13 - 7 6 44 - 8 7 47 - 6 20 18 - 54 0 0 - 7 48 8 23 39 43 30 304 -33 - 7 55 23 - 7 40 53 - 8 41 57 - 6 54 26 - 53 0 0 - 8 22 15 23 39 46 29 304 -34 - 8 29 30 - 8 15 1 - 9 16 5 - 7 28 33 - 52 0 0 - 8 56 20 23 39 48 28 304 -35 - 9 3 35 - 8 49 5 - 9 50 9 - 8 2 38 - 51 0 0 - 9 30 21 23 39 50 27 303 -36 - 9 37 36 - 9 23 6 -10 24 9 - 8 36 40 - 50 0 0 -10 4 17 23 39 52 25 303 -37 -10 11 31 - 9 57 2 -10 58 5 - 9 10 36 - 49 0 0 -10 38 7 23 39 54 24 303 -38 -10 45 21 -10 30 53 -11 31 54 - 9 44 28 - 48 0 0 -11 11 50 23 39 56 23 303 -39 -11 19 5 -11 4 36 -12 5 35 -10 18 13 - 47 0 0 -11 45 26 23 39 58 22 303 -40 -11 52 40 -11 38 12 -12 39 9 -10 51 50 - 46 0 0 -12 18 52 23 39 59 21 302 -41 -12 26 6 -12 11 39 -13 12 34 -11 25 18 - 45 0 0 -12 52 9 23 40 1 20 302 -43 -12 59 22 -12 44 56 -13 45 48 -11 58 38 - 44 0 0 -13 25 15 23 40 2 19 302 -44 -13 32 28 -13 18 2 -14 18 51 -12 31 46 - 43 0 0 -13 58 10 23 40 4 18 302 -45 -14 5 22 -13 50 57 -14 51 43 -13 4 44 - 42 0 0 -14 30 51 23 40 5 16 301 -46 -14 38 4 -14 23 39 -15 24 21 -13 37 29 - 41 0 0 -15 3 20 23 40 6 15 301 -47 -15 10 31 -14 56 8 -15 56 46 -14 10 1 - 40 0 0 -15 35 34 23 40 7 14 301 -48 -15 42 45 -15 28 23 -16 28 56 -14 42 19 - 39 0 0 -16 7 33 23 40 8 13 301 -49 -16 14 44 -16 0 23 -17 0 51 -15 14 22 - 38 0 0 -16 39 16 23 40 9 12 300 -50 -16 46 26 -16 32 7 -17 32 30 -15 46 10 - 37 0 0 -17 10 43 23 40 10 11 300 -51 -17 17 52 -17 3 34 -18 3 52 -16 17 41 - 36 0 0 -17 41 52 23 40 11 10 300 -52 -17 49 1 -17 34 44 -18 34 56 -16 48 55 - 35 0 0 -18 12 43 23 40 12 9 299 -53 -18 19 51 -18 5 36 -19 5 42 -17 19 52 - 34 0 0 -18 43 16 23 40 12 8 299 -54 -18 50 23 -18 36 9 -19 36 10 -17 50 29 - 33 0 0 -19 13 29 23 40 13 7 299 -55 -19 20 36 -19 6 23 -20 6 17 -18 20 48 - 32 0 0 -19 43 22 23 40 13 6 298 -56 -19 50 28 -19 36 16 -20 36 4 -18 50 47 - 31 0 0 -20 12 55 23 40 14 5 298 -57 -20 20 0 -20 5 50 -21 5 31 -19 20 25 - 30 0 0 -20 42 6 23 40 14 3 298 -58 -20 49 10 -20 35 2 -21 34 36 -19 49 43 - 29 0 0 -21 10 56 23 40 14 2 297 -59 -21 17 59 -21 3 52 -22 3 19 -20 18 38 - 28 0 0 -21 39 23 23 40 14 1 297 -60 -21 46 25 -21 32 21 -22 31 40 -20 47 12 - 27 0 0 -22 7 28 23 40 14 0 297 -61 -22 14 29 -22 0 26 .. .. .. -21 15 24 Uncertainty in time = +/- 3 secs [Prediction of 2008 Apr 9.0] Data for the target star ------------------------ * name: TYC 1926-00046-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 03 47.5599 DE: +24 22 21.448 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .031 ) * V mag [mag]: 9.4 * B mag [mag]: 11.1 * Apparent position with proper motion RA(deg): 121.0741744117 DE(deg): 24.3506646957 * Equation of equinoxes (radians) : 0.000040782937157 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (477) Italia approx. diameter [km]: 23 approx. diameter ["]: .010 distance from Earth [AU]: 3.12600 * orbital information: orbit source: Preston date of fit: 2008 Apr 08 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 852 number of rejected observations: 85 time covered by the observations: 1901 Aug 31 - 2008 Mar 27 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.011, 105° remarks: * orbital elements for (477) Italia : Mean anomaly = 156.55686745 deg Arg. of pericenter = 322.33922014 deg Long. of node = 10.72321326 deg Inclination = 5.28808199 deg Eccentricity = 0.18853477 Semimajor axis = 2.41548755 AU Perihelion dist = 1.96008415 AU Mag: H = 10.21, G = 0.15 Epoch of elements : MJD 54599.98400000 TDT (2008 May 13.984) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 13 477 Italia 23h 36.5m UT 9.4 8 3 47.560 24 22 21.45TYC 1926-00046-1 11.1 16.0 23 0.8 3.126 3.105 -12.66 -105.2598 24.376 -175.03 18.67 23.6077 -0.03999 -0.12991 15.08427 -4.50070 0.00499 -0.00087 2000 153.9356592008 5 4.00000322.339220 10.723213 5.2880820.18853477 2.4154876 1.960084210.3 5.00.15 RATE 2.6254090 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.032 0.024 2 4.21 0.032 0 54565.5020080513_0046-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 09, 17:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org