IOTA/IOTA-ES occultation update for (1541) Estonia / HIP 116290 event on 2010 Oct 29, 07:47 UT Visible from Summary ------- On 2010 Oct 29 UT, the 20 km diameter asteroid (1541) Estonia will occult a 7.8 mag star in the constellation Pisces for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.2 mag to 16.0 mag (the magnitude of the asteroid) for at most 3.6 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: 31 * date and approx. time of event: 2010 Oct 29, 07:32 - 2010 Oct 29, 08:00 UT * magnitude of target star: 7.8 * magnitude drop [mag]: 8.2 * estimated maximum duration [s]: 3.6 * Moon: 64 % sunlit, 117° distance * Sun: 137° distance * rough path description: Additional comments ------------------- pm issue The occultation path -------------------- * approximate projected width [km]: 24 * 1 sigma uncertainty interval [path widths]: +/- 2.15 * 1 sigma uncertainty interval [seconds]: +/- 12.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .042 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .044", .027", 67° ) * approx speed of asteroid's shadow [km/s]: 5.6498 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 116290 by 1541 Estonia on 2010 Oct 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 140 0 0 23 49 15 8 0 24 30 107 0 23 55 46 23 42 45 24 23 51 23 14 53 141 0 0 23 53 49 8 0 14 31 108 -1 24 0 19 23 47 19 24 28 25 23 19 26 142 0 0 23 58 32 8 0 3 31 109 -2 24 5 3 23 52 2 24 33 9 23 24 10 143 0 0 24 3 26 7 59 52 32 109 -3 24 9 57 23 56 56 24 38 3 23 29 3 144 0 0 24 8 31 7 59 41 33 110 -4 24 15 2 24 2 0 24 43 8 23 34 7 145 0 0 24 13 45 7 59 30 34 110 -4 24 20 16 24 7 14 24 48 23 23 39 21 146 0 0 24 19 9 7 59 18 35 111 -5 24 25 40 24 12 38 24 53 48 23 44 44 147 0 0 24 24 43 7 59 6 35 112 -6 24 31 14 24 18 12 24 59 22 23 50 18 148 0 0 24 30 27 7 58 54 36 112 -7 24 36 58 24 23 56 25 5 6 23 56 1 149 0 0 24 36 20 7 58 42 37 113 -8 24 42 51 24 29 49 25 11 0 24 1 53 150 0 0 24 42 22 7 58 29 38 114 -9 24 48 54 24 35 51 25 17 3 24 7 55 151 0 0 24 48 34 7 58 17 38 115 -10 24 55 6 24 42 3 25 23 16 24 14 6 152 0 0 24 54 55 7 58 4 39 115 -11 25 1 27 24 48 24 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Uncertainty in time = +/- 12 secs Prediction of 2009 Apr 19.0 Data for the target star ------------------------ * name: HIP 116290 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 33 41.5450 DE: -02 14 40.605 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .019, .016 ) * V mag [mag]: 7.8 * B mag [mag]: 8.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1541) Estonia approx. diameter [km]: 20 approx. diameter ["]: .013 distance from Earth [AU]: 2.14700 * orbital information: orbit source: Preston date of fit: 2009 Apr 18 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1039 number of rejected observations: 47 time covered by the observations: 1923 Nov 09 - 2008 Jun 28 1 sigma uncertainty ellipse (major, minor, PA): 0.040, 0.022, 62° remarks: * orbital elements for (1541) Estonia : Mean anomaly = 172.81768884 deg Arg. of pericenter = 191.00135056 deg Long. of node = 1.53006554 deg Inclination = 4.88167459 deg Eccentricity = 0.06652032 Semimajor axis = 2.77309907 AU Perihelion dist = 2.58863163 AU Mag: H = 11.20, G = 0.15 Epoch of elements : MJD 55498.32500000 TDT (2010 Oct 29.325) ------ occelmnt file for Occult BEGIN ----------------------------------- 2010 Oct 29 1541 Estonia 7h 47.8m UT 7.8 23 33 41.545- 2 14 40.61HIP 116290 8.0 16.0 20 3.6 2.147 -0.856 -2.35 -161.0725 -2.243 58.99 -13.45 7.7969 -0.10021 0.54151 -3.13639 -0.57647 0.00364 0.00152 2000 171.04088220101021.00000191.001351 1.530066 4.8816750.06652032 2.7730991 2.588631611.2 5.00.15 RATE 2.1343030 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.044 0.027 67 3.15 0.028 0 54940.0020101029_116290 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Apr 18, 23:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org