IOTA/IOTA-ES occultation update for (370) Modestia / HIP 12815 event on 2008 Jan 03, 21:11 UT Visible from Africa, Portugal, NE Canada Summary ------- On 2008 Jan 03 UT, the 25 km diameter asteroid (370) Modestia will occult a 8.2 mag star in the constellation Aries for observers along a path across Africa, Portugal, NE Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.1 mag to 14.3 mag (the magnitude of the asteroid) for at most 4.7 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: . The event at a glimpse ---------------------- * Rank: 54 * date and approx. time of event: 2008 Jan 03, 20:52 - 2008 Jan 03, 21:30 UT * midpoint of event [JD]: 2454469.38295417 * magnitude of target star: 8.2 * magnitude drop [mag]: 6.1 * estimated maximum duration [s]: 4.7 * Moon: 19 % sunlit, 174° distance * Sun: 123° distance * rough path description: Africa, Portugal, NE Canada The occultation path -------------------- * approximate projected width [km]: 26 * 1 sigma uncertainty interval [path widths]: +/- 1.18 * 1 sigma uncertainty interval [seconds]: +/- 5.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .021", 80° ) * approx speed of asteroid's shadow [km/s]: 5.2930 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 12815 by 370 Modestia on 2008 Jan 03 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 54 24 50 -23 0 0 21 30 48 0 297 -42 54 7 48 54 41 59 ... .. .. ... .. .. 52 20 18 -22 0 0 21 30 47 2 297 -43 52 4 12 52 36 30 51 26 35 53 15 8 Latitude Latitude Latitude Latitude 51 0 0 -21 19 2 21 30 45 4 298 -44 -21 27 10 -21 10 54 -21 46 19 -20 51 40 50 0 0 -20 47 13 21 30 43 5 298 -45 -20 55 25 -20 39 2 -21 14 43 -20 19 39 49 0 0 -20 14 22 21 30 41 6 299 -46 -20 22 37 -20 6 7 -20 42 4 -19 46 35 48 0 0 -19 40 27 21 30 38 7 299 -47 -19 48 46 -19 32 8 -20 8 22 -19 12 27 47 0 0 -19 5 28 21 30 35 8 299 -47 -19 13 51 -18 57 4 -19 33 36 -18 37 14 46 0 0 -18 29 22 21 30 31 9 300 -48 -18 37 49 -18 20 54 -18 57 43 -18 0 55 45 0 0 -17 52 9 21 30 27 11 300 -49 -18 0 40 -17 43 37 -18 20 44 -17 23 27 44 0 0 -17 13 48 21 30 22 12 300 -50 -17 22 23 -17 5 12 -17 42 38 -16 44 52 43 0 0 -16 34 17 21 30 16 13 300 -50 -16 42 57 -16 25 37 -17 3 22 -16 5 6 42 0 0 -15 53 36 21 30 10 14 301 -51 -16 2 20 -15 44 51 -16 22 56 -15 24 9 41 0 0 -15 11 43 21 30 4 15 301 -52 -15 20 33 -15 2 54 -15 41 19 -14 42 1 40 0 0 -14 28 38 21 29 56 17 301 -53 -14 37 32 -14 19 44 -14 58 30 -13 58 39 39 0 0 -13 44 19 21 29 48 18 301 -54 -13 53 18 -13 35 20 -14 14 28 -13 14 4 38 0 0 -12 58 46 21 29 40 19 302 -54 -13 7 50 -12 49 42 -13 29 12 -12 28 14 37 0 0 -12 11 58 21 29 30 20 302 -55 -12 21 7 -12 2 48 -12 42 40 -11 41 8 36 0 0 -11 23 53 21 29 20 22 302 -56 -11 33 8 -11 14 38 -11 54 53 -10 52 45 35 0 0 -10 34 32 21 29 9 23 302 -56 -10 43 52 -10 25 11 -11 5 50 -10 3 6 34 0 0 - 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2007 Nov 09 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.016, 75° remarks: * orbital elements for (370) Modestia : Mean anomaly = 58.54688201 deg Arg. of pericenter = 68.54641454 deg Long. of node = 291.08481574 deg Inclination = 7.87185335 deg Eccentricity = 0.09087420 Semimajor axis = 2.32455253 AU Perihelion dist = 2.11331067 AU Mag: H = 10.48, G = 0.15 Epoch of elements : MJD 54468.88300000 TDT (2008 Jan 03.883) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 03 370 Modestia 21h 11.5m UT 8.2 2 44 45.090 24 11 3.39HIP 12815 8.6 14.3 25 4.7 1.535 0.946 -11.21 -19.546 24.188 223.25 -22.82 21.1909 .17559 .20316 2.25540 -1.95915 0.00467 0.00103 2000 56.076553620071226.00000 68.546415291.084816 7.8718530.090874202.324552532.1133106710.65 0.15 RATE 2.7809618 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.029 0.021 80.1 2.180 0.026 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Nov 24, 17:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org