IOTA/IOTA-ES occultation update for (2154) Underhill / TYC 2448-00883-1 event on 2012 Dec 09, 12:13 UT Visible from W USA, Canada, E Russia Summary ------- On 2012 Dec 09 UT, the 21 km diameter asteroid (2154) Underhill will occult a 11.4 mag star in the constellation Auriga for observers along a path across W USA, Canada, E Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.6 mag to 16.0 mag (the magnitude of the asteroid) for at most 2.7 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: UCAC. The event at a glimpse ---------------------- * Rank: 16 * date and approx. time of event: 2012 Dec 09, 12:02 - 2012 Dec 09, 12:25 UT * geocentric midpoint of event [JD]: 2456271.00916667 * magnitude of target star: 11.4 * magnitude drop [mag]: 4.6 * estimated maximum duration [s]: 2.7 * Moon: 20 % sunlit, 105° distance * Sun: 154° distance * rough path description: W USA, Canada, E Russia The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 4.11 * 1 sigma uncertainty interval [seconds]: +/- 10.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .093 +/- .082) * 1 sigma uncertainty ellipse (major, minor, PA): ( .093", .082", 98° ) * approx speed of asteroid's shadow [km/s]: 7.8652 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2448-00883-1 by 2154 Underhill on 2012 Dec 9 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 80 0 0 32 50 18 12 25 39 0 46 -11 32 58 47 .. .. .. 34 8 54 .. .. .. 81 0 0 33 39 4 12 25 39 1 47 -12 33 47 32 33 30 37 34 57 32 .. .. .. 82 0 0 34 27 12 12 25 39 2 47 -13 34 35 39 34 18 46 35 45 31 .. .. .. 83 0 0 35 14 40 12 25 38 4 48 -14 35 23 6 35 6 15 36 32 49 .. .. .. 84 0 0 36 1 27 12 25 36 5 48 -15 36 9 51 35 53 3 37 19 24 .. .. .. 85 0 0 36 47 31 12 25 35 6 49 -16 36 55 54 36 39 8 38 5 17 35 30 42 86 0 0 37 32 51 12 25 33 7 49 -17 37 41 13 37 24 30 38 50 24 36 16 15 87 0 0 38 17 28 12 25 31 8 50 -18 38 25 48 38 9 8 39 34 46 37 1 5 88 0 0 39 1 19 12 25 28 9 51 -19 39 9 37 38 53 1 40 18 22 37 45 11 89 0 0 39 44 23 12 25 26 10 51 -20 39 52 40 39 36 7 41 1 11 38 28 31 90 0 0 40 26 42 12 25 23 11 52 -21 40 34 57 40 18 27 41 43 13 39 11 5 91 0 0 41 8 13 12 25 19 12 53 -21 41 16 26 41 0 0 42 24 27 39 52 53 92 0 0 41 48 56 12 25 16 13 53 -22 41 57 8 41 40 46 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51 10 12 2 14 26 301 -1 19 59 22 19 42 59 21 7 11 18 36 3 Uncertainty in time = +/- 12 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 2448-00883-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 49 15.3397 DE: +35 52 32.987 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .023, .031 ) * V mag [mag]: 11.4 * B mag [mag]: 12.3 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2154) Underhill approx. diameter [km]: 21 approx. diameter ["]: .020 distance from Earth [AU]: 1.41900 * orbital information: orbit source: Preston date of fit: 2012 Oct 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 891 number of rejected observations: 13 time covered by the observations: 1958 Apr 08 - 2012 Sep 18 1 sigma uncertainty ellipse (major, minor, PA): 0.090, 0.076, 98° remarks: * orbital elements for (2154) Underhill : Mean anomaly = 336.79937595 deg Arg. of pericenter = 119.63411791 deg Long. of node = 0.90763337 deg Inclination = 7.74558861 deg Eccentricity = 0.12367109 Semimajor axis = 2.63706702 AU Perihelion dist = 2.31093805 AU Mag: H = 12.77, G = 0.15 Epoch of elements : MJD 56270.50900000 TDT (2012 Dec 09.509) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 9 2154 Underhill 12h 13.2m UT 11.4 6 49 15.340 35 52 32.99TYC 2448-00883-1 12.3 16.0 21 2.7 1.419 -2.142 8.95 -159.6281 35.874 -5.16 -22.88 12.2200 0.12538 0.36433 -4.19755 1.44504 -0.00234 -0.00098 2000 336.682227201212 9.00000119.634118 0.907633 7.7455890.12367109 2.6370670 2.310938112.7 5.00.15 RATE 2.3015600 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.093 0.082 98 5.11 0.084 0 0-3-3 056264.0020121209_0883-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 23:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org