IOTA/IOTA-ES occultation update for (372) Palma / HIP 41975 event on 2007 Jan 26, 09:50 UT Visible from USA Summary ------- On 2007 Jan 26 UT, the 189 km diameter asteroid (372) Palma will occult a 6.3 mag star in the constellation Lynx for observers along a path across USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.2 mag to 10.5 mag (the magnitude of the asteroid) for at most 14.0 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Ron Stone, 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: 100 * date and approx. time of event: 2007 Jan 26, 09:42 - 2007 Jan 26, 09:58 UT * magnitude of target star: 6.3 * magnitude drop [mag]: 4.2 * estimated maximum duration [s]: 14.0 * Moon: 55 % sunlit, 79° distance * Sun: 162° distance * rough path description: USA The occultation path -------------------- * approximate projected width [km]: 189 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .025 +/- .020) * 1 sigma uncertainty ellipse (major, minor, PA): ( .026", .018", 115° ) * approx speed of asteroid's shadow [km/s]: 13.5158 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 41975 by 372 Palma on 2007 Jan 26 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 139 0 0 .. .. .. .. .. .. .. .. .. -19 22 57 .. .. .. -19 5 47 .. .. .. 140 0 0 -19 42 40 9 58 5 1 51 -8 -18 36 20 -20 49 4 -18 19 5 .. .. .. 141 0 0 -18 55 37 9 58 5 2 50 -9 -17 49 1 -20 2 18 -17 31 42 -20 19 39 142 0 0 -18 7 54 9 58 4 3 50 -11 -17 1 2 -19 14 50 -16 43 40 -19 32 15 143 0 0 -17 19 32 9 58 4 5 50 -12 -16 12 25 -18 26 43 -15 54 59 -18 44 12 144 0 0 -16 30 32 9 58 3 6 49 -13 -15 23 11 -17 37 57 -15 5 41 -17 55 30 145 0 0 -15 40 56 9 58 2 7 49 -14 -14 33 22 -16 48 34 -14 15 48 -17 6 10 146 0 0 -14 50 45 9 58 0 8 49 -15 -13 42 58 -15 58 36 -13 25 22 -16 16 16 147 0 0 -14 0 2 9 57 59 10 49 -17 -12 52 3 -15 8 5 -12 34 23 -15 25 47 148 0 0 -13 8 48 9 57 57 11 48 -18 -12 0 38 -14 17 2 -11 42 56 -14 34 47 149 0 0 -12 17 5 9 57 55 12 48 -19 -11 8 45 -13 25 29 -10 51 0 -13 43 17 150 0 0 -11 24 55 9 57 52 13 48 -20 -10 16 27 -12 33 29 - 9 58 39 -12 51 19 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18 29 36 9 42 22 1 308 6 19 35 2 .. .. .. 19 52 3 .. .. .. - 38 0 0 .. .. .. .. .. .. .. .. .. 18 49 31 .. .. .. 19 6 36 .. .. .. Data for the target star ------------------------ * name: HIP 41975 * constellation : Lynx * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 33 21.6456 DE: +36 26 11.173 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .015, .009 ) * V mag [mag]: 6.3 * B mag [mag]: 6.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (372) Palma approx. diameter [km]: 189 approx. diameter ["]: .178 distance from Earth [AU]: 1.46800 * orbital information: orbit source: Preston date of fit: 2007 Jan 23 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 616 number of rejected observations: 66 time covered by the observations: 1904 Aug 19 - 2007 Jan 23 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.016, 127° remarks: * orbital elements for (372) Palma : Mean anomaly = 22.00581399 deg Arg. of pericenter = 116.02405718 deg Long. of node = 327.45796038 deg Inclination = 23.86175655 deg Eccentricity = 0.26257185 Semimajor axis = 3.14469680 AU Perihelion dist = 2.31898795 AU Mag: H = 7.47, G = 0.15 Epoch of elements : MJD 54126.41000000 TDT (2007 Jan 26.410) ------ occelmnt file for Occult BEGIN ------------------------------------ 2007 Jan 26 372 Palma 9h 50.2m UT 6.3 8 33 21.646 36 26 11.17HIP 41975 6.6 10.5 189 14.0 1.468 -3.459 -18.57 -144.530 36.442 35.56 -18.76 9.8371 .00960 -.02138 -6.97097 -3.09885 0.00003 -0.00177 2000 20.87290782007 120.00000116.024057327.457960 23.8617570.262571853.144696802.318987957.2 5 0.15 RATE 1.7674043 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.026 0.018 115.2 1.130 0.022 ------ occelmnt file for Occult END ------------------------------------ ============================================ Calculator (s): Steve Preston Date of update: 2007 Jan 24, 03:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org