IOTA/IOTA-ES occultation update for (92) Undina / TYC 1438-00157-1 event on 2008 May 08, 16:09 UT Visible from India, E Russia Summary ------- On 2008 May 08 UT, the 126 km diameter asteroid (92) Undina will occult a 12.7 mag star in the constellation Leo for observers along a path across India, E Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.6 mag to 12.4 mag (the magnitude of the asteroid) for at most 31.3 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: 95 * date and approx. time of event: 2008 May 08, 15:44 - 2008 May 08, 16:36 UT * magnitude of target star: 12.7 * magnitude drop [mag]: 0.6 * estimated maximum duration [s]: 31.3 * Moon: 15 % sunlit, 74° distance * Sun: 119° distance * rough path description: India, E Russia The occultation path -------------------- * approximate projected width [km]: 126 * 1 sigma uncertainty interval [path widths]: +/- 0.43 * 1 sigma uncertainty interval [seconds]: +/- 12.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .026 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .026", .025", 94° ) * approx speed of asteroid's shadow [km/s]: 4.0382 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1438-00157-1 by 92 Undina on 2008 May 8 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 Latitude Latitude Latitude Latitude - 5 0 0 -53 45 50 16 36 55 3 59 0 -53 6 12 -54 25 27 -52 32 7 -54 59 33 - 4 0 0 -53 24 1 16 36 54 3 58 0 -52 44 3 -54 3 59 -52 9 41 -54 38 22 - 3 0 0 -53 1 20 16 36 53 4 57 -1 -52 21 1 -53 41 39 -51 46 20 -54 16 20 - 2 0 0 -52 37 45 16 36 51 5 57 -1 -51 57 4 -53 18 26 -51 22 5 -53 53 25 - 1 0 0 -52 13 13 16 36 49 5 56 -1 -51 32 10 -52 54 17 -50 56 52 -53 29 36 0 0 0 -51 47 44 16 36 47 6 55 -2 -51 6 18 -52 29 11 -50 30 40 -53 4 49 1 0 0 -51 21 16 16 36 45 7 54 -2 -50 39 26 -52 3 6 -50 3 28 -52 39 5 2 0 0 -50 53 47 16 36 42 8 54 -3 -50 11 33 -51 36 1 -49 35 14 -52 12 22 3 0 0 -50 25 15 16 36 39 9 53 -3 -49 42 36 -51 7 54 -49 5 56 -51 44 36 4 0 0 -49 55 38 16 36 36 9 52 -3 -49 12 34 -50 38 43 -48 35 32 -51 15 47 5 0 0 -49 24 55 16 36 32 10 51 -4 -48 41 25 -50 8 26 -48 4 0 -50 45 53 6 0 0 -48 53 3 16 36 28 11 51 -4 -48 9 6 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0 0 62 38 49 15 45 11 14 278 -5 63 13 5 62 4 34 63 42 33 61 35 6 162 0 0 62 34 44 15 45 8 13 278 -5 63 9 5 62 0 25 63 38 37 61 30 53 163 0 0 62 30 14 15 45 5 13 279 -4 63 4 39 61 55 49 63 34 16 61 26 13 164 0 0 62 25 17 15 45 3 12 280 -4 62 59 48 61 50 47 63 29 29 61 21 6 165 0 0 62 19 53 15 45 0 12 281 -4 62 54 30 61 45 17 63 24 16 61 15 32 166 0 0 62 14 3 15 44 57 11 282 -4 62 48 46 61 39 20 63 18 38 61 9 29 167 0 0 62 7 45 15 44 55 11 283 -3 62 42 35 61 32 55 63 12 33 61 2 58 168 0 0 62 0 59 15 44 52 10 284 -3 62 35 56 61 26 1 63 6 1 60 55 58 169 0 0 61 53 44 15 44 50 10 285 -3 62 28 50 61 18 39 62 59 1 60 48 28 170 0 0 61 46 1 15 44 48 9 285 -3 62 21 15 61 10 47 62 51 34 60 40 29 171 0 0 61 37 48 15 44 45 9 286 -2 62 13 11 61 2 25 62 43 38 60 31 59 172 0 0 61 29 5 15 44 43 8 287 -2 62 4 38 60 53 32 62 35 13 60 22 58 173 0 0 61 19 51 15 44 41 8 288 -2 61 55 34 60 44 8 62 26 18 60 13 25 174 0 0 61 10 6 15 44 40 7 289 -2 61 46 0 60 34 12 62 16 53 60 3 20 175 0 0 60 59 48 15 44 38 7 290 -2 61 35 54 60 23 43 62 6 57 59 52 41 176 0 0 60 48 58 15 44 36 6 291 -1 61 25 15 60 12 40 61 56 28 59 41 28 177 0 0 60 37 33 15 44 35 6 292 -1 61 14 3 60 1 3 61 45 27 59 29 40 178 0 0 60 25 34 15 44 33 5 292 -1 61 2 18 59 48 51 61 33 53 59 17 16 179 0 0 60 12 59 15 44 32 5 293 0 60 49 57 59 36 2 61 21 44 59 4 15 180 0 0 59 59 48 15 44 31 4 294 0 60 37 0 59 22 36 61 9 0 58 50 36 Uncertainty in time = +/- 13 secs [Prediction of 2008 Apr 23.0] Data for the target star ------------------------ * name: TYC 1438-00157-1 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 11 34 53.1605 DE: +15 39 27.752 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .023 ) * V mag [mag]: 12.7 * B mag [mag]: 12.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (92) Undina approx. diameter [km]: 126 approx. diameter ["]: .060 distance from Earth [AU]: 2.88700 * orbital information: orbit source: Preston date of fit: 2008 Apr 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 875 number of rejected observations: 119 time covered by the observations: 1900 Apr 10 - 2008 Apr 18 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.009, 108° remarks: * orbital elements for (92) Undina : Mean anomaly = 202.97339998 deg Arg. of pericenter = 242.13070172 deg Long. of node = 101.82946825 deg Inclination = 9.92252328 deg Eccentricity = 0.10110547 Semimajor axis = 3.18836089 AU Perihelion dist = 2.86600014 AU Mag: H = 6.72, G = 0.15 Epoch of elements : MJD 54594.67300000 TDT (2008 May 08.673) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 8 92 Undina 16h 10.7m UT 12.7 11 34 53.161 15 39 27.75TYC 1438-00157-1 12.8 12.4 126 31.3 2.887 -0.241 -6.01 64.1907 15.659 -63.55 17.32 16.1781 -0.02682 0.01554 -1.14521 -1.97068 0.00438 -0.00258 2000 202.1644002008 5 4.00000242.130702101.829468 9.9225230.10110547 3.1883609 2.8660002 6.6 5.00.15 RATE 1.7312220 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.026 0.025 94 1.43 0.026 0 54579.5020080508_0157-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 23, 04:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org