IOTA/IOTA-ES occultation update for (754) Malabar / TYC 1106-00106-1 event on 2009 Aug 09, 14:35 UT Visible from Summary ------- On 2009 Aug 09 UT, the 88 km diameter asteroid (754) Malabar will occult a 12.0 mag star in the constellation Equuleus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.1 mag to 13.9 mag (the magnitude of the asteroid) for at most 6.2 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: 83 * date and approx. time of event: 2009 Aug 09, 14:28 - 2009 Aug 09, 14:42 UT * magnitude of target star: 12.0 * magnitude drop [mag]: 2.1 * estimated maximum duration [s]: 6.2 * Moon: 88 % sunlit, 34° distance * Sun: 156° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 90 * 1 sigma uncertainty interval [path widths]: +/- 0.63 * 1 sigma uncertainty interval [seconds]: +/- 4.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .033) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .033", 90° ) * approx speed of asteroid's shadow [km/s]: 14.1244 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1106-00106-1 by 754 Malabar on 2009 Aug 9 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 ' " Longitude Longitude Longitude Longitude 64 34 18 -46 0 0 14 42 35 2 76 -21 62 2 41 66 51 54 ... .. .. 69 30 36 69 43 3 -45 0 0 14 42 33 6 72 -24 67 41 27 71 37 16 64 54 49 73 52 42 Latitude Latitude Latitude Latitude 70 0 0 -44 56 20 14 42 33 6 72 -25 -44 30 59 -45 21 42 -43 59 6 -45 53 45 71 0 0 -44 43 1 14 42 32 7 71 -25 -44 17 36 -45 8 28 -43 45 37 -45 40 36 72 0 0 -44 29 12 14 42 31 8 70 -26 -44 3 42 -44 54 44 -43 31 37 -45 26 58 73 0 0 -44 14 52 14 42 31 8 70 -27 -43 49 17 -44 40 30 -43 17 7 -45 12 50 74 0 0 -44 0 2 14 42 30 9 69 -27 -43 34 22 -44 25 45 -43 2 5 -44 58 11 75 0 0 -43 44 41 14 42 29 10 68 -28 -43 18 56 -44 10 28 -42 46 32 -44 43 2 76 0 0 -43 28 48 14 42 28 11 68 -29 -43 2 58 -43 54 41 -42 30 28 -44 27 22 77 0 0 -43 12 24 14 42 26 11 67 -30 -42 46 28 -43 38 23 -42 13 51 -44 11 10 78 0 0 -42 55 28 14 42 25 12 66 -30 -42 29 27 -43 21 32 -41 56 43 -43 54 26 79 0 0 -42 38 0 14 42 24 13 66 -31 -42 11 53 -43 4 10 -41 39 2 -43 37 11 80 0 0 -42 20 0 14 42 22 14 65 -32 -41 53 47 -42 46 15 -41 20 49 -43 19 24 81 0 0 -42 1 26 14 42 21 15 64 -33 -41 35 8 -42 27 48 -41 2 2 -43 1 4 82 0 0 -41 42 20 14 42 19 15 64 -34 -41 15 56 -42 8 47 -40 42 43 -42 42 11 83 0 0 -41 22 41 14 42 17 16 63 -34 -40 56 10 -41 49 14 -40 22 50 -42 22 46 84 0 0 -41 2 28 14 42 15 17 62 -35 -40 35 51 -41 29 7 -40 2 23 -42 2 47 85 0 0 -40 41 42 14 42 13 18 62 -36 -40 14 59 -41 8 27 -39 41 23 -41 42 14 86 0 0 -40 20 21 14 42 11 19 61 -37 -39 53 32 -40 47 13 -39 19 48 -41 21 8 87 0 0 -39 58 26 14 42 9 20 60 -38 -39 31 31 -40 25 24 -38 57 39 -40 59 27 88 0 0 -39 35 57 14 42 7 20 60 -38 -39 8 55 -40 3 2 -38 34 56 -40 37 13 89 0 0 -39 12 53 14 42 4 21 59 -39 -38 45 45 -39 40 4 -38 11 38 -40 14 23 90 0 0 -38 49 15 14 42 2 22 58 -40 -38 22 0 -39 16 32 -37 47 44 -39 51 0 91 0 0 -38 25 1 14 41 59 23 58 -41 -37 57 40 -38 52 25 -37 23 16 -39 27 1 92 0 0 -38 0 12 14 41 56 24 57 -42 -37 32 44 -38 27 43 -36 58 13 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5 16 24 26 25 22 33 48 -157 0 0 23 43 1 14 29 6 33 264 -20 24 7 51 23 18 8 24 39 6 22 46 44 -156 0 0 23 55 14 14 29 2 33 265 -19 24 20 2 23 30 25 24 51 13 22 59 5 -155 0 0 24 6 53 14 28 58 32 265 -19 24 31 37 23 42 7 25 2 45 23 10 51 -154 0 0 24 17 57 14 28 55 31 265 -18 24 42 38 23 53 14 25 13 42 23 22 1 -153 0 0 24 28 26 14 28 51 30 266 -17 24 53 5 24 3 45 25 24 5 23 32 37 -152 0 0 24 38 20 14 28 47 29 266 -16 25 2 56 24 13 42 25 33 53 23 42 37 -151 0 0 24 47 40 14 28 44 28 266 -15 25 12 14 24 23 5 25 43 7 23 52 2 -150 0 0 24 56 25 14 28 41 27 267 -14 25 20 56 24 31 52 25 51 47 24 0 53 -149 0 0 25 4 36 14 28 37 26 267 -13 25 29 5 24 40 5 25 59 53 24 9 9 -148 0 0 25 12 12 14 28 34 25 268 -12 25 36 39 24 47 44 26 7 25 24 16 50 -147 0 0 25 19 15 14 28 31 24 268 -12 25 43 40 24 54 47 26 14 23 24 23 56 -146 0 0 25 25 42 14 28 28 23 268 -11 25 50 6 25 1 17 26 20 47 24 30 28 -145 0 0 25 31 36 14 28 25 23 269 -10 25 55 58 25 7 12 26 26 37 24 36 25 -144 0 0 25 36 56 14 28 23 22 269 -9 26 1 16 25 12 33 26 31 53 24 41 48 -143 0 0 25 41 41 14 28 20 21 269 -8 26 6 0 25 17 20 26 36 36 24 46 36 -142 0 0 25 45 52 14 28 18 20 270 -7 26 10 10 25 21 32 26 40 44 24 50 50 -141 0 0 25 49 30 14 28 15 19 270 -6 26 13 47 25 25 11 26 44 20 24 54 29 -140 0 0 25 52 33 14 28 13 18 271 -6 26 16 49 25 28 15 26 47 21 24 57 34 -139 0 0 25 55 2 14 28 11 17 271 -5 26 19 18 25 30 44 26 49 49 25 0 5 -138 0 0 25 56 57 14 28 9 16 272 -4 26 21 12 25 32 40 26 51 43 25 2 1 -137 0 0 25 58 18 14 28 7 15 272 -3 26 22 33 25 34 1 26 53 3 25 3 23 -136 0 0 25 59 5 14 28 5 15 272 -2 26 23 20 25 34 49 26 53 50 25 4 10 -135 0 0 25 59 18 14 28 3 14 273 -1 26 23 33 25 35 2 26 54 3 25 4 23 -134 0 0 25 58 57 14 28 1 13 273 0 26 23 12 25 34 40 26 53 42 25 4 1 Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 1106-00106-1 * constellation : Equuleus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 25 17.4082 DE: +08 19 35.875 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .031, .030 ) * V mag [mag]: 12.0 * B mag [mag]: 13.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (754) Malabar approx. diameter [km]: 88 approx. diameter ["]: .056 distance from Earth [AU]: 2.17000 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 905 number of rejected observations: 72 time covered by the observations: 1901 Oct 12 - 2008 Feb 11 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.013, 91° remarks: * orbital elements for (754) Malabar : Mean anomaly = 205.29915354 deg Arg. of pericenter = 297.56582152 deg Long. of node = 180.10176918 deg Inclination = 24.52739158 deg Eccentricity = 0.04782954 Semimajor axis = 2.99239208 AU Perihelion dist = 2.84926736 AU Mag: H = 9.20, G = 0.15 Epoch of elements : MJD 55052.60800000 TDT (2009 Aug 09.608) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Aug 9 754 Malabar 14h 35.2m UT 12.0 21 25 17.408 8 19 35.87TYC 1106-00106-1 13.1 13.9 88 6.2 2.170 -1.761 -18.99 144.2972 8.332 -37.43 15.70 14.5869 0.11202 -0.15371 -6.45146 -4.68341 -0.00020 -0.00231 2000 204.8025802009 8 7.00000297.565822180.101769 24.5273920.04782954 2.9923921 2.8492673 9.2 5.00.15 RATE 1.9040410 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.038 0.033 90 1.63 0.035 0 54545.5020090809_0106-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 11:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org