IOTA/IOTA-ES occultation update for (398) Admete / TYC 1326-00833-1 event on 2008 May 09, 16:48 UT Visible from S Russia, SW Asia Summary ------- On 2008 May 09 UT, the 47 km diameter asteroid (398) Admete will occult a 10.0 mag star in the constellation Gemini for observers along a path across S Russia, SW Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.2 mag to 15.2 mag (the magnitude of the asteroid) for at most 1.1 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: 71 * date and approx. time of event: 2008 May 09, 16:49 - 2008 May 09, 16:50 UT * midpoint of event [JD]: 2454596.20025 * magnitude of target star: 10.0 * magnitude drop [mag]: 5.2 * estimated maximum duration [s]: 1.1 * Moon: 23 % sunlit, 15° distance * Sun: 44° distance * rough path description: S Russia, SW Asia The occultation path -------------------- * approximate projected width [km]: 59 * 1 sigma uncertainty interval [path widths]: +/- 0.82 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .023 +/- .019) * 1 sigma uncertainty ellipse (major, minor, PA): ( .023", .019", 96° ) * approx speed of asteroid's shadow [km/s]: 42.4440 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1326-00833-1 by 398 Admete on 2008 May 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 ' " Latitude Latitude Latitude Latitude 36 0 0 46 12 20 16 49 46 34 267 0 45 54 8 46 30 36 45 24 28 47 0 46 37 0 0 45 49 38 16 49 48 33 268 -1 45 31 25 46 7 56 45 1 43 46 38 8 38 0 0 45 26 41 16 49 49 33 269 -2 45 8 27 45 45 0 44 38 43 46 15 14 39 0 0 45 3 29 16 49 50 32 270 -3 44 45 13 45 21 49 44 15 28 45 52 5 40 0 0 44 40 2 16 49 52 31 271 -3 44 21 46 44 58 23 43 51 59 45 28 40 41 0 0 44 16 21 16 49 53 30 272 -4 43 58 4 44 34 43 43 28 15 45 5 2 42 0 0 43 52 26 16 49 55 30 273 -5 43 34 9 44 10 49 43 4 19 44 41 9 43 0 0 43 28 19 16 49 56 29 274 -6 43 10 0 43 46 42 42 40 9 44 17 3 44 0 0 43 3 58 16 49 57 28 275 -7 42 45 39 43 22 22 42 15 48 43 52 45 45 0 0 42 39 26 16 49 59 27 275 -7 42 21 6 42 57 50 41 51 14 43 28 13 46 0 0 42 14 42 16 50 0 27 276 -8 41 56 22 42 33 7 41 26 29 43 3 30 47 0 0 41 49 47 16 50 1 26 277 -9 41 31 27 42 8 12 41 1 34 42 38 36 48 0 0 41 24 42 16 50 2 25 278 -10 41 6 21 41 43 7 40 36 28 42 13 31 49 0 0 40 59 27 16 50 4 24 279 -11 40 41 6 41 17 52 40 11 13 41 48 16 50 0 0 40 34 3 16 50 5 23 279 -12 40 15 43 40 52 28 39 45 49 41 22 52 51 0 0 40 8 30 16 50 6 23 280 -13 39 50 10 40 26 55 39 20 17 40 57 19 52 0 0 39 42 50 16 50 7 22 281 -14 39 24 31 40 1 15 38 54 38 40 31 38 53 0 0 39 17 3 16 50 8 21 282 -14 38 58 44 39 35 28 38 28 52 40 5 50 54 0 0 38 51 10 16 50 9 20 282 -15 38 32 51 39 9 34 38 3 0 39 39 55 55 0 0 38 25 11 16 50 10 19 283 -16 38 6 53 38 43 34 37 37 3 39 13 55 56 0 0 37 59 7 16 50 11 18 284 -17 37 40 50 38 17 30 37 11 1 38 47 49 57 0 0 37 32 59 16 50 12 18 285 -18 37 14 42 37 51 21 36 44 55 38 21 39 58 0 0 37 6 48 16 50 13 17 285 -19 36 48 32 37 25 8 36 18 46 37 55 25 59 0 0 36 40 34 16 50 14 16 286 -20 36 22 19 36 58 53 35 52 34 37 29 8 60 0 0 36 14 18 16 50 15 15 287 -21 35 56 4 36 32 37 35 26 21 37 2 50 61 0 0 35 48 1 16 50 15 14 287 -21 35 29 49 36 6 18 35 0 8 36 36 29 62 0 0 35 21 44 16 50 16 13 288 -22 35 3 33 35 40 0 34 33 54 36 10 9 63 0 0 34 55 27 16 50 17 12 288 -23 34 37 17 35 13 42 34 7 41 35 43 48 64 0 0 34 29 12 16 50 17 11 289 -24 34 11 4 34 47 25 33 41 29 35 17 29 65 0 0 34 2 59 16 50 18 10 290 -25 33 44 52 34 21 10 33 15 20 34 51 12 66 0 0 33 36 48 16 50 18 9 290 -26 33 18 43 33 54 58 32 49 14 34 24 57 67 0 0 33 10 41 16 50 19 8 291 -27 32 52 38 33 28 50 32 23 11 33 58 45 68 0 0 32 44 39 16 50 19 7 291 -28 32 26 37 33 2 45 31 57 13 33 32 38 69 0 0 32 18 42 16 50 20 7 292 -29 32 0 42 32 36 46 31 31 21 33 6 36 70 0 0 31 52 50 16 50 20 6 292 -29 31 34 52 32 10 53 31 5 35 32 40 40 71 0 0 31 27 6 16 50 20 5 293 -30 31 9 10 31 45 7 30 39 55 32 14 50 72 0 0 31 1 29 16 50 21 4 293 -31 30 43 35 31 19 28 30 14 23 31 49 7 73 0 0 30 36 0 16 50 21 3 294 -32 30 18 8 30 53 57 .. .. .. 31 23 33 74 0 0 30 10 40 16 50 21 2 294 -33 29 52 50 30 28 35 .. .. .. 30 58 8 75 0 0 29 45 30 16 50 21 1 295 -34 29 27 42 30 3 22 .. .. .. 30 32 52 Uncertainty in time = +/- 1 secs [Prediction of 2008 Mar 31.0] Data for the target star ------------------------ * name: TYC 1326-00833-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 12 23.4063 DE: +21 55 41.190 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .016 ) * V mag [mag]: 10.0 * B mag [mag]: 10.8 * Apparent position with proper motion RA(deg): 93.2216783660 DE(deg): 21.9274706826 * Equation of equinoxes (radians) : 0.000040576381162 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (398) Admete approx. diameter [km]: 47 approx. diameter ["]: .023 distance from Earth [AU]: 2.80400 * orbital information: orbit source: Preston date of fit: 2008 Mar 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 646 number of rejected observations: 51 time covered by the observations: 1907 Sep 11 - 2008 Feb 02 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.010, 102° remarks: * orbital elements for (398) Admete : Mean anomaly = 20.26566540 deg Arg. of pericenter = 159.37098030 deg Long. of node = 280.05137999 deg Inclination = 9.52367321 deg Eccentricity = 0.22406815 Semimajor axis = 2.73884129 AU Perihelion dist = 2.12515420 AU Mag: H = 10.25, G = 0.15 Epoch of elements : MJD 54595.70000000 TDT (2008 May 09.700) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 9 398 Admete 16h 48.4m UT 10.0 6 12 23.406 21 55 41.19TYC 1326-00833-1 10.8 15.2 47 1.1 2.804 5.373 -7.33 -26.8627 21.931 -72.98 17.59 16.8060 0.05864 0.60394 23.84244 -2.33572 0.00366 -0.00018 2000 19.0262162008 5 4.00000159.370980280.051380 9.5236730.22406815 2.7388413 2.125154210.3 5.00.15 RATE 2.1744720 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.023 0.019 96 1.82 0.019 0 54556.5020080509_0833-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 31, 04:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org