IOTA/IOTA-ES occultation update for (173) Ino / 2UCAC 31614525 event on 2009 Jun 25, 01:53 UT Visible from Europe Summary ------- On 2009 Jun 25 UT, the 154 km diameter asteroid (173) Ino will occult a 12.9 mag star in the constellation Cetus for observers along a path across Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.5 mag to 12.4 mag (the magnitude of the asteroid) for at most 6.9 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: 99 * date and approx. time of event: 2009 Jun 25, 01:49 - 2009 Jun 25, 01:51 UT * midpoint of event [JD]: 2455007.5785 * magnitude of target star: 12.9 * magnitude drop [mag]: 0.5 * estimated maximum duration [s]: 6.9 * Moon: 7 % sunlit, 118° distance * Sun: 87° distance * rough path description: Europe The occultation path -------------------- * approximate projected width [km]: 225 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .028", .024", 87° ) * approx speed of asteroid's shadow [km/s]: 22.2153 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 31614525 by 173 Ino on 2009 Jun 25 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 - 23 0 0 40 3 23 1 49 47 0 90 -27 39 2 55 41 4 59 38 34 17 41 34 59 - 22 0 0 40 3 15 1 49 47 1 91 -27 39 2 48 41 4 52 38 34 10 41 34 52 - 21 0 0 40 3 16 1 49 48 2 92 -26 39 2 49 41 4 53 38 34 11 41 34 54 - 20 0 0 40 3 26 1 49 48 2 92 -26 39 2 59 41 5 3 38 34 20 41 35 4 - 19 0 0 40 3 45 1 49 48 3 93 -26 39 3 17 41 5 22 38 34 38 41 35 23 - 18 0 0 40 4 12 1 49 48 4 94 -26 39 3 44 41 5 49 38 35 5 41 35 50 - 17 0 0 40 4 47 1 49 49 5 94 -26 39 4 19 41 6 25 38 35 40 41 36 26 - 16 0 0 40 5 32 1 49 49 6 95 -26 39 5 3 41 7 10 38 36 24 41 37 11 - 15 0 0 40 6 24 1 49 50 6 96 -26 39 5 55 41 8 3 38 37 16 41 38 4 - 14 0 0 40 7 26 1 49 51 7 96 -26 39 6 56 41 9 4 38 38 17 41 39 6 - 13 0 0 40 8 36 1 49 51 8 97 -25 39 8 6 41 10 15 38 39 27 41 40 16 - 12 0 0 40 9 54 1 49 52 9 98 -25 39 9 24 41 11 34 38 40 44 41 41 36 - 11 0 0 40 11 21 1 49 53 9 98 -25 39 10 50 41 13 1 38 42 11 41 43 3 - 10 0 0 40 12 56 1 49 54 10 99 -25 39 12 25 41 14 37 38 43 45 41 44 39 - 9 0 0 40 14 40 1 49 55 11 100 -24 39 14 8 41 16 21 38 45 28 41 46 24 - 8 0 0 40 16 32 1 49 56 12 100 -24 39 16 0 41 18 14 38 47 20 41 48 17 - 7 0 0 40 18 33 1 49 57 12 101 -24 39 18 0 41 20 15 38 49 20 41 50 19 - 6 0 0 40 20 42 1 49 59 13 102 -24 39 20 9 41 22 25 38 51 28 41 52 29 - 5 0 0 40 22 59 1 50 0 14 102 -23 39 22 25 41 24 43 38 53 44 41 54 47 - 4 0 0 40 25 25 1 50 1 15 103 -23 39 24 50 41 27 9 38 56 9 41 57 14 - 3 0 0 40 27 59 1 50 3 15 104 -23 39 27 23 41 29 44 38 58 42 41 59 48 - 2 0 0 40 30 41 1 50 4 16 104 -22 39 30 5 41 32 26 39 1 22 42 2 32 - 1 0 0 40 33 31 1 50 6 17 105 -22 39 32 54 41 35 17 39 4 11 42 5 23 0 0 0 40 36 29 1 50 7 18 106 -21 39 35 51 41 38 16 39 7 8 42 8 22 1 0 0 40 39 35 1 50 9 18 107 -21 39 38 56 41 41 23 39 10 13 42 11 29 2 0 0 40 42 49 1 50 11 19 107 -21 39 42 10 41 44 38 39 13 26 42 14 44 3 0 0 40 46 11 1 50 13 20 108 -20 39 45 31 41 48 0 39 16 47 42 18 8 4 0 0 40 49 40 1 50 15 20 109 -20 39 48 59 41 51 31 39 20 15 42 21 38 5 0 0 40 53 17 1 50 17 21 110 -19 39 52 36 41 55 9 39 23 51 42 25 17 6 0 0 40 57 2 1 50 19 22 110 -19 39 56 20 41 58 55 39 27 35 42 29 3 7 0 0 41 0 55 1 50 21 22 111 -18 40 0 11 42 2 48 39 31 26 42 32 57 8 0 0 41 4 55 1 50 23 23 112 -18 40 4 10 42 6 49 39 35 24 42 36 58 9 0 0 41 9 2 1 50 25 24 113 -17 40 8 17 42 10 57 39 39 30 42 41 7 10 0 0 41 13 16 1 50 28 24 114 -17 40 12 30 42 15 13 39 43 43 42 45 23 11 0 0 41 17 38 1 50 30 25 115 -16 40 16 51 42 19 35 39 48 4 42 49 46 12 0 0 41 22 7 1 50 32 26 115 -16 40 21 19 42 24 5 39 52 31 42 54 17 13 0 0 41 26 42 1 50 35 26 116 -15 40 25 53 42 28 42 39 57 5 42 58 54 14 0 0 41 31 25 1 50 37 27 117 -15 40 30 35 42 33 25 40 1 47 43 3 38 15 0 0 41 36 14 1 50 40 28 118 -14 40 35 23 42 38 16 40 6 34 43 8 29 16 0 0 41 41 10 1 50 43 28 119 -14 40 40 18 42 43 13 40 11 29 43 13 26 17 0 0 41 46 13 1 50 45 29 120 -13 40 45 20 42 48 17 40 16 30 43 18 31 18 0 0 41 51 22 1 50 48 30 121 -13 40 50 28 42 53 27 40 21 38 43 23 41 19 0 0 41 56 37 1 50 51 30 122 -12 40 55 42 42 58 43 40 26 52 43 28 58 20 0 0 42 1 59 1 50 54 31 123 -12 41 1 3 43 4 6 40 32 12 43 34 21 21 0 0 42 7 26 1 50 56 31 124 -11 41 6 29 43 9 34 40 37 38 43 39 50 22 0 0 42 13 0 1 50 59 32 125 -10 41 12 2 43 15 9 40 43 10 43 45 25 23 0 0 42 18 39 1 51 2 32 126 -10 41 17 40 43 20 49 40 48 48 43 51 6 24 0 0 42 24 24 1 51 5 33 127 -9 41 23 24 43 26 35 40 54 31 43 56 53 25 0 0 42 30 15 1 51 8 34 128 -9 41 29 14 43 32 27 41 0 21 44 2 45 26 0 0 42 36 11 1 51 11 34 129 -8 41 35 9 43 38 24 41 6 15 44 8 43 27 0 0 42 42 12 1 51 15 35 130 -7 41 41 9 43 44 26 41 12 15 44 14 46 28 0 0 42 48 19 1 51 18 35 131 -7 41 47 15 43 50 34 41 18 20 44 20 54 29 0 0 42 54 30 1 51 21 36 132 -6 41 53 26 43 56 46 41 24 30 44 27 7 30 0 0 43 0 47 1 51 24 36 133 -5 41 59 41 44 3 4 41 30 45 44 33 24 31 0 0 43 7 8 1 51 27 37 134 -5 42 6 1 44 9 26 41 37 5 44 39 47 32 0 0 43 13 33 1 51 31 37 135 -4 42 12 26 44 15 52 41 43 29 44 46 14 33 0 0 43 20 4 1 51 34 37 136 -3 42 18 55 44 22 23 41 49 58 44 52 46 34 0 0 43 26 38 1 51 37 38 138 -3 42 25 29 44 28 59 41 56 31 44 59 22 35 0 0 43 33 17 1 51 41 38 139 -2 42 32 6 44 35 38 42 3 9 45 6 1 36 0 0 43 39 59 1 51 44 39 140 -2 42 38 48 44 42 22 42 9 50 45 12 45 37 0 0 43 46 45 1 51 47 39 141 -1 42 45 34 44 49 9 42 16 35 45 19 33 38 0 0 43 53 35 1 51 51 39 142 0 42 52 23 44 56 0 42 23 24 45 26 24 Uncertainty in time = +/- 2 secs Prediction of 2009 May 18.0 Data for the target star ------------------------ * name: 2UCAC 31614525 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 28 56.4538 DE: -00 16 19.954 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .023 ) * V mag [mag]: 12.9 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 7.3600643604 DE(deg): -0.2179112468 * Equation of equinoxes (radians) : 0.000066393910703 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (173) Ino approx. diameter [km]: 154 approx. diameter ["]: .103 distance from Earth [AU]: 2.06100 * orbital information: orbit source: Preston date of fit: 2009 May 15 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 906 number of rejected observations: 108 time covered by the observations: 1903 Mar 26 - 2008 Sep 18 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.009, 80° remarks: * orbital elements for (173) Ino : Mean anomaly = 336.38836729 deg Arg. of pericenter = 227.65039741 deg Long. of node = 148.30399643 deg Inclination = 14.21481071 deg Eccentricity = 0.20717432 Semimajor axis = 2.74401563 AU Perihelion dist = 2.17552607 AU Mag: H = 7.58, G = 0.01 Epoch of elements : MJD 55007.07900000 TDT (2009 Jun 25.079) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 25 173 Ino 1h 53.0m UT 12.9 0 28 56.454- 0 16 19.952UCAC 31614525 0.0 12.4 154 6.9 2.061 3.542 6.47 65.6293 -0.273 152.39 23.39 1.8840 -0.09236 0.72233 12.44675 1.51757 -0.00488 -0.00211 2000 334.8534102009 618.00000227.650397148.303996 14.2148110.20717432 2.7440156 2.1755261 7.7 5.00.01 RATE 2.1683240 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.028 0.024 87 1.24 0.024 0 54969.0020090625_614525 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 May 18, 00:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org