IOTA/IOTA-ES occultation update for (1189) Terentia / UCAC2 20406767 event on 2009 May 06, 03:50 UT Visible from Summary ------- On 2009 May 06 UT, the 62 km diameter asteroid (1189) Terentia will occult a 11.9 mag star in the constellation Hydra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.8 mag to 14.6 mag (the magnitude of the asteroid) for at most 4.5 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: 62 * date and approx. time of event: 2009 May 06, 03:44 - 2009 May 06, 03:57 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 2.8 * estimated maximum duration [s]: 4.5 * Moon: 91 % sunlit, 40° distance * Sun: 169° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 72 * 1 sigma uncertainty interval [path widths]: +/- 0.99 * 1 sigma uncertainty interval [seconds]: +/- 5.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .048 +/- .038) * 1 sigma uncertainty ellipse (major, minor, PA): ( .048", .038", 95° ) * approx speed of asteroid's shadow [km/s]: 13.6777 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 20406767 by 1189 Terentia on 2009 May 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 -117 0 0 44 42 20 3 57 31 0 131 -10 .. .. .. 44 16 23 .. .. .. .. .. .. -116 0 0 44 4 28 3 57 31 1 132 -11 44 30 38 43 38 28 45 22 55 .. .. .. -115 0 0 43 26 2 3 57 31 2 133 -12 43 52 15 42 59 59 44 44 37 42 8 50 -114 0 0 42 47 3 3 57 31 3 133 -13 43 13 18 42 20 57 44 5 46 41 29 43 -113 0 0 42 7 32 3 57 30 4 134 -14 42 33 49 41 41 24 43 26 21 40 50 6 -112 0 0 41 27 30 3 57 29 5 135 -15 41 53 49 41 1 20 42 46 25 40 9 59 -111 0 0 40 46 58 3 57 28 6 135 -16 41 13 19 40 20 48 42 5 57 39 29 24 -110 0 0 40 5 59 3 57 27 7 136 -17 40 32 20 39 39 47 41 25 1 38 48 22 -109 0 0 39 24 33 3 57 26 8 137 -18 39 50 54 38 58 20 40 43 36 38 6 54 -108 0 0 38 42 41 3 57 25 9 137 -19 39 9 3 38 16 28 40 1 45 37 25 2 -107 0 0 38 0 25 3 57 23 10 138 -20 38 26 47 37 34 13 39 19 28 36 42 48 -106 0 0 37 17 48 3 57 21 11 139 -21 37 44 9 36 51 37 38 36 49 36 0 12 -105 0 0 36 34 50 3 57 19 12 139 -22 37 1 10 36 8 40 37 53 47 35 17 18 -104 0 0 35 51 33 3 57 17 13 140 -23 36 17 52 35 25 24 37 10 26 34 34 5 -103 0 0 35 7 59 3 57 14 15 140 -24 35 34 16 34 41 53 36 26 46 33 50 37 -102 0 0 34 24 11 3 57 12 16 141 -25 34 50 25 33 58 6 35 42 51 33 6 55 -101 0 0 33 40 8 3 57 9 17 142 -27 34 6 20 33 14 6 34 58 40 32 23 0 -100 0 0 32 55 55 3 57 6 18 142 -28 33 22 3 32 29 56 34 14 18 31 38 55 - 99 0 0 32 11 32 3 57 3 19 143 -29 32 37 37 31 45 36 33 29 44 30 54 42 - 98 0 0 31 27 1 3 56 59 20 143 -30 31 53 2 31 1 9 32 45 2 30 10 22 - 97 0 0 30 42 25 3 56 55 21 144 -31 31 8 22 30 16 36 32 0 13 29 25 57 - 96 0 0 29 57 44 3 56 52 22 145 -32 30 23 37 29 32 1 31 15 20 28 41 30 - 95 0 0 29 13 2 3 56 47 23 145 -33 29 38 51 28 47 23 30 30 24 27 57 1 - 94 0 0 28 28 20 3 56 43 24 146 -34 28 54 4 28 2 46 29 45 27 27 12 34 - 93 0 0 27 43 41 3 56 39 25 146 -35 28 9 19 27 18 11 29 0 31 26 28 9 - 92 0 0 26 59 5 3 56 34 27 147 -37 27 24 37 26 33 41 28 15 39 25 43 49 - 91 0 0 26 14 34 3 56 29 28 148 -38 26 40 1 25 49 16 27 30 51 24 59 35 - 90 0 0 25 30 12 3 56 24 29 148 -39 25 55 33 25 4 59 26 46 10 24 15 29 - 89 0 0 24 45 58 3 56 19 30 149 -40 25 11 13 24 20 52 26 1 38 23 31 33 - 88 0 0 24 1 56 3 56 13 31 150 -41 24 27 5 23 36 56 25 17 17 22 47 49 - 87 0 0 23 18 7 3 56 8 32 150 -42 23 43 9 22 53 13 24 33 8 22 4 18 - 86 0 0 22 34 32 3 56 2 33 151 -43 22 59 27 22 9 44 23 49 13 21 21 3 - 85 0 0 21 51 13 3 55 56 34 151 -44 22 16 1 21 26 32 23 5 34 20 38 3 - 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Uncertainty in time = +/- 6 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 20406767 * constellation : Hydra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 58 05.6371 DE: -27 52 38.717 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .035, .033 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1189) Terentia approx. diameter [km]: 62 approx. diameter ["]: .039 distance from Earth [AU]: 2.19600 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 837 number of rejected observations: 67 time covered by the observations: 1930 Sep 22 - 2008 Feb 14 1 sigma uncertainty ellipse (major, minor, PA): 0.033, 0.018, 100° remarks: * orbital elements for (1189) Terentia : Mean anomaly = 224.06773428 deg Arg. of pericenter = 97.15227226 deg Long. of node = 275.40970759 deg Inclination = 9.86198584 deg Eccentricity = 0.11614358 Semimajor axis = 2.92927740 AU Perihelion dist = 2.58906063 AU Mag: H = 9.83, G = 0.15 Epoch of elements : MJD 54957.16000000 TDT (2009 May 06.160) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 May 6 1189 Terentia 3h 50.8m UT 11.9 14 58 5.637-27 52 38.72UCAC2 20406767 0.0 14.6 62 4.5 2.196 -2.155 11.84 -57.3244 -27.880 121.46 16.56 3.8470 0.19231 0.46428 -7.13250 2.95410 -0.00011 0.00112 2000 222.6601432009 429.00000 97.152272275.409708 9.8619860.11614358 2.9292774 2.589060610.0 5.00.15 RATE 1.9659090 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.048 0.038 95 1.99 0.039 0 54545.5020090506_406767 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 07:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org