IOTA/IOTA-ES occultation update for (545) Messalina / TYC 2394-01231-1 event on 2008 Mar 27, 13:05 UT Visible from SE Asia, Indonesia Summary ------- On 2008 Mar 27 UT, the 111 km diameter asteroid (545) Messalina will occult a 10.7 mag star in the constellation Auriga for observers along a path across SE Asia, Indonesia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.7 mag to 15.4 mag (the magnitude of the asteroid) for at most 4.9 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: 92 * date and approx. time of event: 2008 Mar 27, 13:06 - 2008 Mar 27, 13:09 UT * midpoint of event [JD]: 2454553.04532083 * magnitude of target star: 10.7 * magnitude drop [mag]: 4.7 * estimated maximum duration [s]: 4.9 * Moon: 72 % sunlit, 169° distance * Sun: 74° distance * rough path description: SE Asia, Indonesia The occultation path -------------------- * approximate projected width [km]: 111 * 1 sigma uncertainty interval [path widths]: +/- 0.50 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .022 +/- .020) * 1 sigma uncertainty ellipse (major, minor, PA): ( .022", .020", 87° ) * approx speed of asteroid's shadow [km/s]: 22.5334 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2394-01231-1 by 545 Messalina on 2008 Mar 27 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 77 0 0 26 12 30 13 6 43 72 295 -1 25 40 33 26 44 27 25 8 34 27 16 24 78 0 0 25 52 44 13 6 47 71 295 -2 25 20 41 26 24 47 24 48 37 26 56 50 79 0 0 25 32 24 13 6 52 70 295 -3 25 0 15 26 4 33 24 28 4 26 36 42 80 0 0 25 11 30 13 6 57 69 295 -4 24 39 14 25 43 45 24 6 57 26 15 59 81 0 0 24 50 1 13 7 1 68 295 -5 24 17 39 25 22 22 23 45 16 25 54 43 82 0 0 24 27 57 13 7 6 67 296 -6 23 55 29 25 0 25 23 23 0 25 32 52 83 0 0 24 5 20 13 7 10 66 296 -7 23 32 45 24 37 54 23 0 9 25 10 27 84 0 0 23 42 7 13 7 15 65 296 -8 23 9 26 24 14 48 22 36 44 24 47 28 85 0 0 23 18 21 13 7 19 64 296 -9 22 45 33 23 51 8 22 12 44 24 23 54 86 0 0 22 53 59 13 7 24 63 297 -9 22 21 5 23 26 53 21 48 10 23 59 46 87 0 0 22 29 4 13 7 28 62 297 -10 21 56 3 23 2 4 21 23 1 23 35 4 88 0 0 22 3 34 13 7 33 61 297 -11 21 30 26 22 36 41 20 57 18 23 9 48 89 0 0 21 37 30 13 7 37 60 298 -12 21 4 16 22 10 44 20 31 0 22 43 57 90 0 0 21 10 52 13 7 42 59 298 -13 20 37 31 21 44 13 20 4 9 22 17 33 91 0 0 20 43 41 13 7 46 58 298 -14 20 10 13 21 17 8 19 36 44 21 50 35 92 0 0 20 15 55 13 7 51 57 298 -15 19 42 21 20 49 29 19 8 45 21 23 3 93 0 0 19 47 37 13 7 55 56 299 -17 19 13 55 20 21 17 18 40 13 20 54 58 94 0 0 19 18 45 13 7 59 55 299 -18 18 44 56 19 52 32 18 11 7 20 26 19 95 0 0 18 49 20 13 8 4 54 299 -19 18 15 25 19 23 14 17 41 29 19 57 8 96 0 0 18 19 23 13 8 8 52 300 -20 17 45 21 18 53 24 17 11 18 19 27 24 97 0 0 17 48 53 13 8 12 51 300 -21 17 14 45 18 23 1 16 40 36 18 57 8 98 0 0 17 17 52 13 8 16 50 300 -22 16 43 37 17 52 6 16 9 21 18 26 20 99 0 0 16 46 19 13 8 21 49 300 -23 16 11 58 17 20 40 15 37 36 17 55 1 100 0 0 16 14 16 13 8 25 48 301 -24 15 39 48 16 48 43 15 5 20 17 23 10 101 0 0 15 41 43 13 8 29 47 301 -25 15 7 8 16 16 16 14 32 33 16 50 49 102 0 0 15 8 39 13 8 33 46 301 -26 14 33 59 15 43 19 13 59 18 16 17 59 103 0 0 14 35 7 13 8 37 45 301 -27 14 0 21 15 9 53 13 25 33 15 44 39 104 0 0 14 1 7 13 8 41 44 301 -28 13 26 14 14 35 59 12 51 21 15 10 50 105 0 0 13 26 38 13 8 44 42 302 -29 12 51 40 14 1 36 12 16 41 14 36 33 106 0 0 12 51 43 13 8 48 41 302 -30 12 16 39 13 26 47 11 41 34 14 1 50 107 0 0 12 16 22 13 8 52 40 302 -31 11 41 12 12 51 31 11 6 1 13 26 39 108 0 0 11 40 35 13 8 56 39 302 -32 11 5 20 12 15 49 10 30 4 12 51 3 109 0 0 11 4 24 13 8 59 38 302 -33 10 29 4 11 39 44 9 53 43 12 15 3 110 0 0 10 27 50 13 9 3 37 303 -35 9 52 24 11 3 14 9 16 58 11 38 38 111 0 0 9 50 53 13 9 6 36 303 -36 9 15 23 10 26 22 8 39 52 11 1 51 112 0 0 9 13 34 13 9 9 34 303 -37 8 38 0 9 49 8 8 2 24 10 24 42 113 0 0 8 35 56 13 9 13 33 303 -38 8 0 17 9 11 34 7 24 37 9 47 12 114 0 0 7 57 58 13 9 16 32 303 -39 7 22 15 8 33 40 6 46 31 9 9 22 115 0 0 7 19 42 13 9 19 31 303 -40 6 43 55 7 55 28 6 8 7 8 31 14 116 0 0 6 41 9 13 9 22 30 303 -41 6 5 18 7 16 59 5 29 27 7 52 48 117 0 0 6 2 20 13 9 25 28 304 -42 5 26 26 6 38 13 4 50 32 7 14 6 118 0 0 5 23 17 13 9 27 27 304 -43 4 47 20 5 59 13 4 11 22 6 35 9 119 0 0 4 44 1 13 9 30 26 304 -44 4 8 1 5 20 0 3 32 0 5 55 59 120 0 0 4 4 33 13 9 33 25 304 -46 3 28 30 4 40 34 2 52 27 5 16 36 121 0 0 3 24 54 13 9 35 24 304 -47 2 48 49 4 0 58 2 12 44 4 37 1 122 0 0 2 45 6 13 9 37 22 304 -48 2 9 0 3 21 12 1 32 53 3 57 18 123 0 0 2 5 10 13 9 40 21 304 -49 1 29 2 2 41 18 0 52 54 3 17 25 124 0 0 1 25 8 13 9 42 20 304 -50 0 48 59 2 1 17 0 12 49 2 37 26 125 0 0 0 45 1 13 9 44 19 304 -51 0 8 51 1 21 11 - 0 27 20 1 57 21 126 0 0 0 4 51 13 9 46 18 304 -52 - 0 31 20 0 41 2 - 1 7 32 1 17 12 127 0 0 - 0 35 22 13 9 47 16 304 -53 - 1 11 33 0 0 49 - 1 47 46 0 37 0 128 0 0 - 1 15 35 13 9 49 15 304 -54 - 1 51 47 - 0 39 24 - 2 28 0 - 0 3 13 129 0 0 - 1 55 48 13 9 50 14 304 -55 - 2 32 0 - 1 19 37 - 3 8 12 - 0 43 26 130 0 0 - 2 35 59 13 9 52 13 304 -56 - 3 12 10 - 1 59 48 - 3 48 22 - 1 23 38 131 0 0 - 3 16 6 13 9 53 12 304 -57 - 3 52 17 - 2 39 56 - 4 28 28 - 2 3 47 132 0 0 - 3 56 9 13 9 54 10 304 -58 - 4 32 18 - 3 20 0 - 5 8 28 - 2 43 51 133 0 0 - 4 36 5 13 9 55 9 304 -59 - 5 12 13 - 3 59 57 - 5 48 21 - 3 23 50 134 0 0 - 5 15 53 13 9 56 8 304 -60 - 5 51 59 - 4 39 48 - 6 28 6 - 4 3 42 135 0 0 - 5 55 33 13 9 57 7 303 -61 - 6 31 37 - 5 19 29 - 7 7 42 - 4 43 26 136 0 0 - 6 35 2 13 9 57 6 303 -62 - 7 11 4 - 5 59 1 - 7 47 7 - 5 22 59 137 0 0 - 7 14 20 13 9 58 4 303 -63 - 7 50 19 - 6 38 21 - 8 26 20 - 6 2 22 138 0 0 - 7 53 25 13 9 58 3 303 -64 - 8 29 22 - 7 17 29 - 9 5 19 - 6 41 33 139 0 0 - 8 32 16 13 9 59 2 303 -65 - 9 8 10 - 7 56 23 - 9 44 4 - 7 20 30 140 0 0 - 9 10 52 13 9 59 1 303 -66 - 9 46 42 - 8 35 2 -10 22 33 - 7 59 12 Uncertainty in time = +/- 3 secs [Prediction of 2008 Feb 14.0] Data for the target star ------------------------ * name: TYC 2394-01231-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 17 57.7954 DE: +32 12 18.623 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .017 ) * V mag [mag]: 10.7 * B mag [mag]: 10.9 * Apparent position with proper motion RA(deg): 79.6256159447 DE(deg): 32.2166227793 * Equation of equinoxes (radians) : 0.000040721892931 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (545) Messalina approx. diameter [km]: 111 approx. diameter ["]: .040 distance from Earth [AU]: 3.82300 * orbital information: orbit source: Preston date of fit: 2008 Feb 13 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 777 number of rejected observations: 97 time covered by the observations: 1904 Oct 03 - 2008 Jan 27 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.011, 81° remarks: * orbital elements for (545) Messalina : Mean anomaly = 146.48367512 deg Arg. of pericenter = 326.06545928 deg Long. of node = 334.25499451 deg Inclination = 11.12316942 deg Eccentricity = 0.16897905 Semimajor axis = 3.20307146 AU Perihelion dist = 2.66181950 AU Mag: H = 8.71, G = 0.15 Epoch of elements : MJD 54552.54500000 TDT (2008 Mar 27.545) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 27 545 Messalina 13h 5.3m UT 10.7 5 17 57.795 32 12 18.62TYC 2394-01231-1 10.9 15.4 111 4.9 3.823 2.273 -4.91 57.8402 32.207 -15.00 2.87 13.0877 -0.00536 -0.02840 12.53776 -2.13637 0.00566 0.00068 2000 146.0461112008 325.00000326.065459334.254995 11.1231690.16897905 3.2030715 2.6618195 8.8 5.00.15 RATE 1.7193090 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.022 0.020 87 1.50 0.020 0 54510.5020080327_1231-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 14, 19:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org