IOTA/IOTA-ES occultation update for (2889) Brno / TYC 0574-00128-1 event on 2012 Sep 15, 21:56 UT Visible from India, Africa Summary ------- On 2012 Sep 15 UT, the 20 km diameter asteroid (2889) Brno will occult a 10.3 mag star in the constellation Pegasus for observers along a path across India, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.9 mag to 15.2 mag (the magnitude of the asteroid) for at most 1.9 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: 20 * date and approx. time of event: 2012 Sep 15, 21:46 - 2012 Sep 15, 22:05 UT * geocentric midpoint of event [JD]: 2456186.41408333 * magnitude of target star: 10.3 * magnitude drop [mag]: 4.9 * estimated maximum duration [s]: 1.9 * Moon: 0 % sunlit, 170° distance * Sun: 166° distance * rough path description: India, Africa The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 3.38 * 1 sigma uncertainty interval [seconds]: +/- 7.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .069 +/- .053) * 1 sigma uncertainty ellipse (major, minor, PA): ( .070", .051", 74° ) * approx speed of asteroid's shadow [km/s]: 10.5426 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0574-00128-1 by 2889 Brno on 2012 Sep 15 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 - 63 1 30 -52 0 0 22 5 59 3 77 -2 - 63 46 51 - 62 17 50 ... .. .. - 57 55 37 - 56 28 42 -51 0 0 22 5 54 7 72 -6 - 57 1 52 - 55 56 11 - 61 7 19 - 52 30 53 Latitude Latitude Latitude Latitude - 56 0 0 -50 54 51 22 5 54 8 72 -6 -50 49 2 -51 0 41 -50 9 42 -51 40 11 - 55 0 0 -50 43 46 22 5 53 8 71 -7 -50 37 55 -50 49 37 -49 58 28 -51 29 14 - 54 0 0 -50 32 12 22 5 52 9 70 -8 -50 26 21 -50 38 4 -49 46 46 -51 17 49 - 53 0 0 -50 20 11 22 5 51 10 70 -8 -50 14 17 -50 26 4 -49 34 35 -51 5 56 - 52 0 0 -50 7 40 22 5 49 10 69 -9 -50 1 46 -50 13 34 -49 21 56 -50 53 35 - 51 0 0 -49 54 41 22 5 48 11 68 -10 -49 48 45 -50 0 36 -49 8 47 -50 40 45 - 50 0 0 -49 41 12 22 5 47 12 67 -10 -49 35 15 -49 47 9 -48 55 9 -50 27 26 - 49 0 0 -49 27 14 22 5 45 12 67 -11 -49 21 16 -49 33 12 -48 41 0 -50 13 38 - 48 0 0 -49 12 46 22 5 43 13 66 -12 -49 6 46 -49 18 45 -48 26 22 -49 59 20 - 47 0 0 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Uncertainty in time = +/- 8 secs Prediction of 2012 Sep 8.0 Data for the target star ------------------------ * name: TYC 0574-00128-1 * constellation : Pegasus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 46 31.7625 DE: +05 11 12.774 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .023 ) * V mag [mag]: 10.3 * B mag [mag]: 10.8 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2889) Brno approx. diameter [km]: 20 approx. diameter ["]: .016 distance from Earth [AU]: 1.69800 * orbital information: orbit source: Preston date of fit: 2012 Sep 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 891 number of rejected observations: 6 time covered by the observations: 1953 May 07 - 2012 Sep 03 1 sigma uncertainty ellipse (major, minor, PA): 0.066, 0.046, 72° remarks: * orbital elements for (2889) Brno : Mean anomaly = 3.77596336 deg Arg. of pericenter = 122.39471427 deg Long. of node = 220.62815761 deg Inclination = 9.49567472 deg Eccentricity = 0.11246141 Semimajor axis = 3.02228679 AU Perihelion dist = 2.68239615 AU Mag: H = 11.35, G = 0.15 Epoch of elements : MJD 56185.91400000 TDT (2012 Sep 15.914) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 15 2889 Brno 21h 56.3m UT 10.3 22 46 31.762 5 11 12.77TYC 0574-00128-1 10.8 15.2 20 1.9 1.698 -1.636 -18.76 17.3004 5.192 -150.34 2.60 21.9380 0.15928 -0.20724 -4.72061 -3.62282 0.00120 -0.00076 2000 2.6665792012 910.00000122.394714220.628158 9.4956750.11246141 3.0222868 2.682396211.5 5.00.15 RATE 1.8758610 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.070 0.051 74 4.38 0.055 0 0 5 4 056178.0020120915_0128-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 07, 22:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org