IOTA/IOTA-ES occultation update for (3617) Eicher / TYC 0241-01181-1 event on 2009 Apr 08, 06:14 UT Visible from Summary ------- On 2009 Apr 08 UT, the 13 km diameter asteroid (3617) Eicher will occult a 9.5 mag star in the constellation Leo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.6 mag to 16.1 mag (the magnitude of the asteroid) for at most 2.0 seconds. This update is based on historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 8 * date and approx. time of event: 2009 Apr 08, 05:58 - 2009 Apr 08, 06:29 UT * magnitude of target star: 9.5 * magnitude drop [mag]: 6.6 * estimated maximum duration [s]: 2.0 * Moon: 98 % sunlit, 39° distance * Sun: 124° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 7.88 * 1 sigma uncertainty interval [seconds]: +/- 10.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .080 +/- .057) * 1 sigma uncertainty ellipse (major, minor, PA): ( .080", .057", 96° ) * approx speed of asteroid's shadow [km/s]: 6.6954 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0241-01181-1 by 3617 Eicher on 2009 Apr 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 -176 25 24 -81 0 0 5 58 50 0 33 -8 -175 57 48 -176 53 8 -168 57 44 ... .. .. -172 43 11 -80 0 0 5 58 51 1 30 -8 -172 19 10 -173 7 16 -166 10 45 ... .. .. Latitude Latitude Latitude Latitude -172 0 0 -79 46 35 5 58 51 2 29 -8 -79 54 2 -79 39 9 .. .. .. -77 43 8 -171 0 0 -79 26 49 5 58 51 2 28 -9 -79 34 29 -79 19 10 -81 36 36 -77 19 56 -170 0 0 -79 5 39 5 58 51 2 27 -9 -79 13 32 -78 57 47 -81 19 19 -76 55 8 -169 0 0 -78 42 57 5 58 51 3 26 -9 -78 51 4 -78 34 50 -81 0 44 -76 28 35 -168 0 0 -78 18 33 5 58 52 3 25 -9 -78 26 55 -78 10 11 -80 40 42 -76 0 6 -167 0 0 -77 52 16 5 58 52 4 24 -10 -78 0 55 -77 43 39 -80 19 4 -75 29 32 -166 0 0 -77 23 56 5 58 53 4 23 -10 -77 32 51 -77 15 2 -79 55 40 -74 56 38 -165 0 0 -76 53 19 5 58 54 5 22 -10 -77 2 32 -76 44 6 -79 30 18 -74 21 11 -164 0 0 -76 20 9 5 58 55 5 21 -11 -76 29 42 -76 10 38 -79 2 43 -73 42 55 -163 0 0 -75 44 11 5 58 56 6 20 -11 -75 54 3 -75 34 19 -78 32 40 -73 1 33 -162 0 0 -75 5 4 5 58 57 7 19 -11 -75 15 18 -74 54 51 -77 59 51 -72 16 44 -161 0 0 -74 22 27 5 58 59 8 18 -12 -74 33 3 -74 11 51 -77 23 55 -71 28 6 -160 0 0 -73 35 55 5 59 1 8 17 -12 -73 46 55 -73 24 56 -76 44 27 -70 35 13 -159 0 0 -72 45 0 5 59 3 9 16 -13 -72 56 26 -72 33 36 -76 1 2 -69 37 39 -158 0 0 -71 49 11 5 59 6 10 15 -13 -72 1 3 -71 37 20 -75 13 6 -68 34 51 -157 0 0 -70 47 51 5 59 9 11 14 -14 -71 0 12 -70 35 33 -74 20 4 -67 26 15 -156 0 0 -69 40 22 5 59 13 12 13 -15 -69 53 11 -69 27 36 -73 21 14 -66 11 12 -155 0 0 -68 26 0 5 59 18 14 12 -16 -68 39 19 -68 12 43 -72 15 51 -64 49 2 -154 0 0 -67 3 54 5 59 25 15 11 -16 -67 17 44 -66 50 8 -71 3 1 -63 18 57 -153 0 0 -65 33 14 5 59 32 17 10 -17 -65 47 35 -65 18 56 -69 41 45 -61 40 12 -152 0 0 -63 53 2 5 59 41 18 9 -18 -64 7 54 -63 38 14 -68 11 1 -59 51 55 -151 0 0 -62 2 21 5 59 52 20 8 -19 -62 17 43 -61 47 2 -66 29 39 -57 53 16 -150 0 0 -60 0 12 6 0 5 22 7 -21 -60 16 4 -59 44 24 -64 36 30 -55 43 27 -149 0 0 -57 45 39 6 0 21 25 6 -22 -58 1 59 -57 29 24 -62 30 23 -53 21 43 -148 0 0 -55 17 55 6 0 40 27 5 -24 -55 34 40 -55 1 15 -60 10 14 -50 47 30 -147 0 0 -52 36 23 6 1 3 30 4 -25 -52 53 29 -52 19 21 -57 35 8 -48 0 24 -146 0 0 -49 40 44 6 1 30 33 3 -27 -49 58 7 -49 23 26 -54 44 30 -45 0 23 -145 0 0 -46 31 6 6 2 2 36 1 -29 -46 48 41 -46 13 37 -51 38 10 -41 47 49 -144 0 0 -43 8 8 6 2 39 40 0 -31 -43 25 47 -42 50 34 -48 16 31 -38 23 36 -143 0 0 -39 33 3 6 3 21 43 358 -33 -39 50 40 -39 15 32 -44 40 36 -34 49 9 -142 0 0 -35 47 46 6 4 8 47 357 -35 -36 5 13 -35 30 24 -40 52 13 -31 6 29 -141 0 0 -31 54 44 6 5 0 51 354 -37 -32 11 53 -31 37 40 -36 53 50 -27 18 4 -140 0 0 -27 56 54 6 5 56 54 352 -39 -28 13 38 -27 40 14 -32 48 32 -23 26 42 -139 0 0 -23 57 24 6 6 55 58 349 -41 -24 13 38 -23 41 15 -28 39 45 -19 35 18 -138 0 0 -19 59 24 6 7 57 62 345 -43 -20 15 2 -19 43 50 -24 31 1 -15 46 40 -137 0 0 -16 5 44 6 9 0 65 339 -45 -16 20 43 -15 50 49 -20 25 39 -12 3 15 -136 0 0 -12 18 49 6 10 2 68 333 -46 -12 33 6 -12 4 34 -16 26 29 - 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55 0 0 52 52 40 6 29 15 3 279 -20 52 48 59 52 56 20 51 50 54 .. .. .. - 54 0 0 52 47 4 6 29 16 2 280 -20 52 43 23 52 50 45 51 45 9 .. .. .. - 53 0 0 52 40 49 6 29 16 1 281 -20 52 37 8 52 44 31 51 38 45 .. .. .. - 52 0 0 52 33 56 6 29 16 1 281 -19 52 30 13 52 37 38 51 31 40 .. .. .. - 51 0 0 52 26 23 6 29 16 0 282 -19 52 22 40 52 30 6 .. .. .. .. .. .. Uncertainty in time = +/- 15 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 0241-01181-1 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 32 46.6546 DE: +07 28 32.402 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .020 ) * V mag [mag]: 9.5 * B mag [mag]: 10.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3617) Eicher approx. diameter [km]: 13 approx. diameter ["]: .010 distance from Earth [AU]: 1.72300 * orbital information: orbit source: Preston date of fit: 2008 Apr 24 source of used astrometry: MPC (via Astdys) number of used observations: 726 number of rejected observations: 4 time covered by the observations: 1950 Jun 07 - 2008 Mar 09 1 sigma uncertainty ellipse (major, minor, PA): 0.078, 0.053, 96° remarks: * orbital elements for (3617) Eicher : Mean anomaly = 316.09702102 deg Arg. of pericenter = 34.38437108 deg Long. of node = 181.65753165 deg Inclination = 14.50492529 deg Eccentricity = 0.11138824 Semimajor axis = 2.62688259 AU Perihelion dist = 2.33427876 AU Mag: H = 12.18, G = 0.15 Epoch of elements : MJD 54929.26000000 TDT (2009 Apr 08.260) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Apr 8 3617 Eicher 6h 14.0m UT 9.5 9 32 46.655 7 28 32.40TYC 0241-01181-1 10.8 16.1 13 2.0 1.723 0.467 17.98 -146.9596 7.471 86.96 7.27 6.2340 0.25733 -0.09936 1.35782 3.52672 0.00446 -0.00112 2000 313.9533702009 330.00000 34.384371181.657532 14.5049250.11138824 2.6268826 2.334278812.0 5.00.15 RATE 2.3149580 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.080 0.057 96 8.88 0.082 0 54581.5020090408_1181-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 06:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org