IOTA/IOTA-ES occultation update for (72) Feronia / TYC 5234-00153-1 event on 2012 Sep 16, 02:07 UT Visible from Africa, Brazil, Argentina, Chile Summary ------- On 2012 Sep 16 UT, the 83 km diameter asteroid (72) Feronia will occult a 10.5 mag star in the constellation Aquarius for observers along a path across Africa, Brazil, Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.1 mag to 11.1 mag (the magnitude of the asteroid) for at most 11.0 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: 99 * date and approx. time of event: 2012 Sep 16, 01:53 - 2012 Sep 16, 02:20 UT * geocentric midpoint of event [JD]: 2456186.58829167 * magnitude of target star: 10.5 * magnitude drop [mag]: 1.1 * estimated maximum duration [s]: 11.0 * Moon: 0 % sunlit, 170° distance * Sun: 168° distance * rough path description: Africa, Brazil, Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 87 * 1 sigma uncertainty interval [path widths]: +/- 0.28 * 1 sigma uncertainty interval [seconds]: +/- 3.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .027", 80° ) * approx speed of asteroid's shadow [km/s]: 7.5753 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5234-00153-1 by 72 Feronia on 2012 Sep 16 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 38 50 38 21 0 0 1 53 55 9 266 -19 35 33 58 43 59 58 34 2 28 ... .. .. 31 44 1 20 0 0 1 54 16 15 264 -26 29 37 28 34 7 52 28 32 5 35 39 29 Latitude Latitude Latitude Latitude 30 0 0 19 40 32 1 54 23 17 264 -27 20 4 27 19 16 33 20 17 50 19 3 6 29 0 0 19 28 25 1 54 28 18 263 -28 19 52 24 19 4 24 20 5 48 18 50 55 28 0 0 19 15 41 1 54 32 19 263 -29 19 39 43 18 51 36 19 53 9 18 38 6 27 0 0 19 2 19 1 54 37 20 263 -30 19 26 24 18 38 11 19 39 52 18 24 38 26 0 0 18 48 18 1 54 42 21 262 -31 19 12 27 18 24 7 19 25 57 18 10 32 25 0 0 18 33 39 1 54 47 22 262 -32 18 57 52 18 9 24 19 11 24 17 55 47 24 0 0 18 18 22 1 54 53 23 262 -33 18 42 38 17 54 3 18 56 12 17 40 24 23 0 0 18 2 26 1 54 59 24 262 -34 18 26 46 17 38 3 18 40 22 17 24 22 22 0 0 17 45 52 1 55 5 25 261 -35 18 10 16 17 21 24 18 23 54 17 7 41 21 0 0 17 28 39 1 55 11 26 261 -36 17 53 7 17 4 7 18 6 48 16 50 22 20 0 0 17 10 47 1 55 18 27 261 -37 17 35 20 16 46 11 17 49 3 16 32 23 19 0 0 16 52 17 1 55 25 28 261 -38 17 16 54 16 27 36 17 30 39 16 13 46 18 0 0 16 33 8 1 55 32 29 261 -39 16 57 49 16 8 23 17 11 37 15 54 30 17 0 0 16 13 20 1 55 39 29 260 -40 16 38 6 15 48 30 16 51 57 15 34 34 16 0 0 15 52 53 1 55 47 30 260 -41 16 17 44 15 27 58 16 31 38 15 14 0 15 0 0 15 31 47 1 55 55 31 260 -42 15 56 43 15 6 47 16 10 40 14 52 46 14 0 0 15 10 2 1 56 3 32 260 -43 15 35 3 14 44 57 15 49 3 14 30 53 13 0 0 14 47 38 1 56 11 33 260 -44 15 12 45 14 22 28 15 26 47 14 8 21 12 0 0 14 24 36 1 56 20 34 260 -45 14 49 48 13 59 20 15 3 53 13 45 10 11 0 0 14 0 54 1 56 29 35 260 -46 14 26 11 13 35 33 14 40 20 13 21 20 10 0 0 13 36 33 1 56 38 36 260 -47 14 1 56 13 11 7 14 16 8 12 56 50 9 0 0 13 11 34 1 56 47 37 259 -48 13 37 2 12 46 2 13 51 17 12 31 42 8 0 0 12 45 55 1 56 57 38 259 -49 13 11 30 12 20 17 13 25 47 12 5 54 7 0 0 12 19 38 1 57 7 39 259 -50 12 45 18 11 53 54 12 59 39 11 39 28 6 0 0 11 52 42 1 57 17 40 259 -51 12 18 28 11 26 52 12 32 52 11 12 23 5 0 0 11 25 7 1 57 28 41 260 -52 11 50 59 10 59 11 12 5 27 10 44 38 4 0 0 10 56 54 1 57 38 42 260 -53 11 22 52 10 30 52 11 37 23 10 16 16 3 0 0 10 28 3 1 57 49 43 260 -54 10 54 7 10 1 54 11 8 42 9 47 14 2 0 0 9 58 33 1 58 1 44 260 -55 10 24 44 9 32 18 10 39 22 9 17 35 1 0 0 9 28 25 1 58 12 45 260 -56 9 54 42 9 2 4 10 9 24 8 47 17 0 0 0 8 57 40 1 58 24 46 260 -57 9 24 3 8 31 12 9 38 48 8 16 22 - 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2012 Aug 29 1 sigma uncertainty ellipse (major, minor, PA): 0.028, 0.015, 71° remarks: * orbital elements for (72) Feronia : Mean anomaly = 29.80142172 deg Arg. of pericenter = 102.48726383 deg Long. of node = 208.07798898 deg Inclination = 5.41816624 deg Eccentricity = 0.11995548 Semimajor axis = 2.26602968 AU Perihelion dist = 1.99420700 AU Mag: H = 8.97, G = 0.15 Epoch of elements : MJD 56186.08800000 TDT (2012 Sep 16.088) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 16 72 Feronia 2h 7.1m UT 10.5 22 48 13.108- 0 16 38.70TYC 5234-00153-1 11.4 11.1 83 11.0 1.046 -1.873 -22.42 -45.1637 -0.272 146.93 2.53 2.1190 0.18419 -0.23100 -3.34297 -2.66574 0.00109 -0.00021 2000 28.0423632012 910.00000102.487264208.077989 5.4181660.11995548 2.2660297 1.9942070 8.9 5.00.15 RATE 2.8893870 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.027 80 1.28 0.030 0 0-4 4 056178.0020120916_0153-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 07, 22:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org