IOTA/IOTA-ES occultation update for (367) Amicitia / TYC 6862-01039-1 event on 2009 Jul 02, 21:57 UT Visible from Summary ------- On 2009 Jul 02 UT, the 19 km diameter asteroid (367) Amicitia will occult a 10.3 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.2 mag to 13.4 mag (the magnitude of the asteroid) for at most 1.8 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: 40 * date and approx. time of event: 2009 Jul 02, 21:49 - 2009 Jul 02, 22:06 UT * magnitude of target star: 10.3 * magnitude drop [mag]: 3.2 * estimated maximum duration [s]: 1.8 * Moon: 83 % sunlit, 47° distance * Sun: 177° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 1.64 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .031", 89° ) * approx speed of asteroid's shadow [km/s]: 10.7082 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6862-01039-1 by 367 Amicitia on 2009 Jul 2 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 - 50 0 0 20 54 59 22 6 2 3 118 -1 21 1 52 20 48 7 21 24 29 .. .. .. - 49 0 0 20 27 47 22 6 2 4 118 -2 20 34 39 20 20 56 20 57 13 19 58 33 - 48 0 0 20 0 56 22 6 1 5 118 -3 20 7 46 19 54 6 20 30 16 19 31 46 - 47 0 0 19 34 25 22 6 0 6 119 -4 19 41 14 19 27 36 20 3 39 19 5 20 - 46 0 0 19 8 15 22 5 58 7 119 -5 19 15 2 19 1 27 19 37 24 18 39 16 - 45 0 0 18 42 26 22 5 57 8 119 -6 18 49 13 18 35 40 19 11 31 18 13 32 - 44 0 0 18 17 0 22 5 55 9 120 -7 18 23 46 18 10 16 18 46 0 17 48 12 - 43 0 0 17 51 57 22 5 53 10 120 -8 17 58 42 17 45 14 18 20 51 17 23 14 - 42 0 0 17 27 18 22 5 51 11 120 -9 17 34 1 17 20 35 17 56 6 16 58 39 - 41 0 0 17 3 2 22 5 48 12 121 -10 17 9 44 16 56 21 17 31 45 16 34 28 - 40 0 0 16 39 10 22 5 45 13 121 -11 16 45 51 16 32 30 17 7 49 16 10 42 - 39 0 0 16 15 44 22 5 42 14 121 -12 16 22 23 16 9 5 16 44 17 15 47 20 - 38 0 0 15 52 42 22 5 39 15 121 -13 15 59 20 15 46 4 16 21 10 15 24 23 - 37 0 0 15 30 6 22 5 36 16 122 -14 15 36 43 15 23 29 15 58 29 15 1 52 - 36 0 0 15 7 56 22 5 33 17 122 -15 15 14 32 15 1 20 15 36 14 14 39 47 - 35 0 0 14 46 12 22 5 29 18 122 -16 14 52 46 14 39 37 15 14 25 14 18 8 - 34 0 0 14 24 54 22 5 25 19 123 -17 14 31 28 14 18 21 14 53 3 13 56 55 - 33 0 0 14 4 4 22 5 21 20 123 -18 14 10 36 13 57 32 14 32 8 13 36 9 - 32 0 0 13 43 41 22 5 16 21 123 -19 13 50 12 13 37 10 14 11 40 13 15 51 - 31 0 0 13 23 45 22 5 12 22 124 -20 13 30 15 13 17 15 13 51 40 12 55 59 - 30 0 0 13 4 17 22 5 7 23 124 -21 13 10 46 12 57 48 13 32 7 12 36 36 - 29 0 0 12 45 17 22 5 2 24 124 -22 12 51 45 12 38 49 13 13 2 12 17 40 - 28 0 0 12 26 45 22 4 57 25 125 -23 12 33 12 12 20 18 12 54 26 11 59 12 - 27 0 0 12 8 41 22 4 52 26 125 -24 12 15 7 12 2 15 12 36 18 11 41 13 - 26 0 0 11 51 6 22 4 47 27 125 -25 11 57 32 11 44 41 12 18 39 11 23 42 - 25 0 0 11 34 0 22 4 41 28 126 -26 11 40 24 11 27 36 12 1 29 11 6 40 - 24 0 0 11 17 23 22 4 35 28 126 -27 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21 49 26 7 235 -10 33 29 16 33 14 52 33 52 59 32 51 21 95 0 0 33 52 8 21 49 25 6 235 -9 33 59 21 33 44 56 34 23 5 33 21 24 96 0 0 34 22 9 21 49 24 5 236 -8 34 29 22 34 14 56 34 53 7 33 51 23 97 0 0 34 52 4 21 49 23 4 236 -7 34 59 18 34 44 52 35 23 4 34 21 17 98 0 0 35 21 54 21 49 22 3 237 -6 35 29 7 35 14 41 35 52 55 34 51 5 99 0 0 35 51 36 21 49 22 2 237 -5 35 58 50 35 44 23 36 22 38 .. .. .. 100 0 0 36 21 11 21 49 21 1 238 -4 36 28 25 36 13 58 36 52 13 .. .. .. 101 0 0 36 50 37 21 49 21 0 239 -3 36 57 51 36 43 24 .. .. .. .. .. .. Uncertainty in time = +/- 4 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 6862-01039-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 37 35.5040 DE: -24 35 11.720 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .022 ) * V mag [mag]: 10.3 * B mag [mag]: 10.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (367) Amicitia approx. diameter [km]: 19 approx. diameter ["]: .019 distance from Earth [AU]: 1.36000 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 863 number of rejected observations: 79 time covered by the observations: 1906 Mar 28 - 2008 Mar 18 1 sigma uncertainty ellipse (major, minor, PA): 0.033, 0.022, 89° remarks: * orbital elements for (367) Amicitia : Mean anomaly = 133.87834398 deg Arg. of pericenter = 54.93763299 deg Long. of node = 83.53574908 deg Inclination = 2.94290626 deg Eccentricity = 0.09552431 Semimajor axis = 2.21953583 AU Perihelion dist = 2.00751621 AU Mag: H = 10.49, G = 0.15 Epoch of elements : MJD 55014.91500000 TDT (2009 Jul 02.915) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 2 367 Amicitia 21h 57.7m UT 10.3 18 37 35.504-24 35 11.72TYC 6862-01039-1 10.5 13.4 19 1.8 1.360 -2.834 -5.74 28.9041 -24.584 -148.38 22.97 21.9616 -0.07925 0.53367 -5.97849 -0.88765 0.00024 0.00015 2000 132.4133552009 628.00000 54.937633 83.535749 2.9429060.09552431 2.2195358 2.007516210.7 5.00.15 RATE 2.9806490 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.040 0.031 89 2.64 0.032 0 54581.5020090702_1039-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 07:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org