IOTA/IOTA-ES occultation update for (599) Luisa / HIP 26592 event on 2009 Dec 29, 04:04 UT Visible from Europe, N Canada, Alaska Summary ------- On 2009 Dec 29 UT, the 65 km diameter asteroid (599) Luisa will occult a 6.6 mag star in the constellation Auriga for observers along a path across Europe, N Canada, Alaska. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.4 mag to 13.0 mag (the magnitude of the asteroid) for at most 4.9 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 96 * date and approx. time of event: 2009 Dec 29, 03:58 - 2009 Dec 29, 04:10 UT * magnitude of target star: 6.6 * magnitude drop [mag]: 6.4 * estimated maximum duration [s]: 4.9 * Moon: 90 % sunlit, 27° distance * Sun: 159° distance * rough path description: Europe, N Canada, Alaska Additional comments ------------------- pm issue The occultation path -------------------- * approximate projected width [km]: 77 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .023 +/- .019) * 1 sigma uncertainty ellipse (major, minor, PA): ( .023", .019", 81° ) * approx speed of asteroid's shadow [km/s]: 13.2801 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 26592 by 599 Luisa on 2009 Dec 29 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 -174 0 0 42 51 8 4 10 49 21 53 -1 43 24 19 42 18 17 43 51 46 41 51 35 -173 0 0 43 45 48 4 10 44 23 54 -2 44 19 0 43 12 54 44 46 30 42 46 10 -172 0 0 44 39 42 4 10 40 24 55 -3 45 12 57 44 6 47 45 40 28 43 40 2 -171 0 0 45 32 50 4 10 35 25 55 -4 46 6 5 44 59 54 46 33 37 44 33 8 -170 0 0 46 25 8 4 10 31 26 56 -5 46 58 23 45 52 12 47 25 55 45 25 26 -169 0 0 47 16 35 4 10 26 27 57 -6 47 49 49 46 43 40 48 17 20 46 16 55 -168 0 0 48 7 8 4 10 21 28 58 -7 48 40 20 47 34 15 49 7 50 47 7 31 -167 0 0 48 56 45 4 10 16 29 59 -8 49 29 55 48 23 55 49 57 23 47 57 14 -166 0 0 49 45 26 4 10 11 30 60 -9 50 18 33 49 12 40 50 45 57 48 46 1 -165 0 0 50 33 9 4 10 6 31 61 -10 51 6 11 50 0 27 51 33 32 49 33 51 -164 0 0 51 19 53 4 10 1 32 62 -11 51 52 50 50 47 15 52 20 6 50 20 44 -163 0 0 52 5 36 4 9 55 32 63 -12 52 38 27 51 33 4 53 5 38 51 6 37 -162 0 0 52 50 18 4 9 50 33 64 -12 53 23 2 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Uncertainty in time = +/- 2 secs Prediction of 2009 Dec 27.0 Data for the target star ------------------------ * name: HIP 26592 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 39 08.6672 DE: +41 21 29.680 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .012, .009 ) * V mag [mag]: 6.6 * B mag [mag]: 7.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (599) Luisa approx. diameter [km]: 65 approx. diameter ["]: .046 distance from Earth [AU]: 1.93200 * orbital information: orbit source: Preston date of fit: 2009 Dec 27 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 900 number of rejected observations: 57 time covered by the observations: 1906 Apr 29 - 2009 Dec 15 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.016, 77° remarks: * orbital elements for (599) Luisa : Mean anomaly = 80.31212038 deg Arg. of pericenter = 292.84629444 deg Long. of node = 44.65544433 deg Inclination = 16.66215748 deg Eccentricity = 0.29339690 Semimajor axis = 2.77179057 AU Perihelion dist = 1.95855580 AU Mag: H = 8.79, G = 0.15 Epoch of elements : MJD 55194.17000000 TDT (2009 Dec 29.170) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Dec 29 599 Luisa 4h 4.7m UT 6.6 5 39 8.667 41 21 29.68HIP 26592 7.4 13.0 65 4.9 1.932 -3.024 1.92 -74.1521 41.358 119.31 -23.22 4.0791 0.03044 0.53684 -7.48369 0.42381 0.00128 -0.00176 2000 79.42148620091225.00000292.846294 44.655444 16.6621570.29339690 2.7717906 1.9585558 8.7 5.00.15 RATE 2.1358140 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.023 0.019 81 1.41 0.019 0 055192.0020091229__26592 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Dec 27, 11:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org