IOTA/IOTA-ES occultation update for (28) Bellona / TYC 4666-00002-1 event on 2009 Jun 04, 09:43 UT Visible from Summary ------- On 2009 Jun 04 UT, the 124 km diameter asteroid (28) Bellona will occult a 12.2 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 1.3 mag to 13.0 mag (the magnitude of the asteroid) for at most 5.2 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: 84 * date and approx. time of event: 2009 Jun 04, 09:40 - 2009 Jun 04, 09:42 UT * magnitude of target star: 12.2 * magnitude drop [mag]: 1.3 * estimated maximum duration [s]: 5.2 * Moon: 90 % sunlit, 142° distance * Sun: 74° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 153 * 1 sigma uncertainty interval [path widths]: +/- 0.62 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .032 +/- .033) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .032", 360° ) * approx speed of asteroid's shadow [km/s]: 23.8268 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4666-00002-1 by 28 Bellona on 2009 Jun 4 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 -126 0 0 21 5 23 9 40 6 0 93 -43 20 24 0 21 47 7 .. .. .. 22 39 24 -125 0 0 21 2 54 9 40 6 1 93 -42 20 21 32 21 44 38 .. .. .. 22 36 55 -124 0 0 21 0 44 9 40 6 2 93 -42 20 19 23 21 42 28 .. .. .. 22 34 44 -123 0 0 20 58 54 9 40 6 3 94 -41 20 17 32 21 40 37 .. .. .. 22 32 53 -122 0 0 20 57 22 9 40 7 4 94 -41 20 16 1 21 39 5 19 25 12 22 31 20 -121 0 0 20 56 9 9 40 7 5 95 -41 20 14 48 21 37 52 19 24 0 22 30 7 -120 0 0 20 55 15 9 40 8 6 95 -40 20 13 54 21 36 58 19 23 6 22 29 13 -119 0 0 20 54 40 9 40 8 7 95 -40 20 13 19 21 36 23 19 22 31 22 28 38 -118 0 0 20 54 25 9 40 9 8 96 -39 20 13 4 21 36 8 19 22 16 22 28 23 -117 0 0 20 54 28 9 40 10 9 96 -39 20 13 7 21 36 11 19 22 19 22 28 27 -116 0 0 20 54 51 9 40 10 10 96 -38 20 13 29 21 36 34 19 22 41 22 28 50 -115 0 0 20 55 33 9 40 11 10 97 -37 20 14 11 21 37 16 19 23 22 22 29 32 -114 0 0 20 56 33 9 40 12 11 97 -37 20 15 11 21 38 18 19 24 22 22 30 34 -113 0 0 20 57 54 9 40 14 12 98 -36 20 16 31 21 39 38 19 25 41 22 31 55 -112 0 0 20 59 33 9 40 15 13 98 -36 20 18 9 21 41 18 19 27 19 22 33 36 -111 0 0 21 1 31 9 40 16 14 98 -35 20 20 7 21 43 17 19 29 16 22 35 36 -110 0 0 21 3 49 9 40 17 15 99 -34 20 22 24 21 45 35 19 31 32 22 37 55 -109 0 0 21 6 25 9 40 19 16 99 -34 20 25 0 21 48 12 19 34 7 22 40 33 -108 0 0 21 9 21 9 40 20 17 100 -33 20 27 54 21 51 9 19 37 0 22 43 31 -107 0 0 21 12 36 9 40 22 18 100 -32 20 31 8 21 54 25 19 40 13 22 46 48 -106 0 0 21 16 9 9 40 24 19 100 -32 20 34 41 21 57 59 19 43 45 22 50 24 -105 0 0 21 20 2 9 40 25 20 101 -31 20 38 32 22 1 53 19 47 35 22 54 19 -104 0 0 21 24 13 9 40 27 21 101 -30 20 42 43 22 6 6 19 51 44 22 58 33 -103 0 0 21 28 44 9 40 29 21 102 -30 20 47 12 22 10 37 19 56 11 23 3 6 -102 0 0 21 33 33 9 40 31 22 102 -29 20 52 0 22 15 28 20 0 58 23 7 58 -101 0 0 21 38 40 9 40 33 23 103 -28 20 57 6 22 20 37 20 6 2 23 13 9 -100 0 0 21 44 7 9 40 36 24 103 -27 21 2 31 22 26 4 20 11 26 23 18 39 - 99 0 0 21 49 51 9 40 38 25 104 -27 21 8 14 22 31 51 20 17 7 23 24 27 - 98 0 0 21 55 55 9 40 40 26 104 -26 21 14 16 22 37 56 20 23 7 23 30 34 - 97 0 0 22 2 16 9 40 43 27 105 -25 21 20 36 22 44 19 20 29 25 23 36 59 - 96 0 0 22 8 56 9 40 45 28 105 -24 21 27 14 22 51 0 20 36 1 23 43 42 - 95 0 0 22 15 53 9 40 48 29 106 -24 21 34 10 22 57 59 20 42 55 23 50 44 - 94 0 0 22 23 9 9 40 50 29 107 -23 21 41 24 23 5 17 20 50 6 23 58 4 - 93 0 0 22 30 43 9 40 53 30 107 -22 21 48 55 23 12 52 20 57 36 24 5 42 - 92 0 0 22 38 34 9 40 56 31 108 -21 21 56 44 23 20 45 21 5 23 24 13 37 - 91 0 0 22 46 42 9 40 59 32 108 -20 22 4 51 23 28 56 21 13 27 24 21 50 - 90 0 0 22 55 8 9 41 2 33 109 -19 22 13 15 23 37 24 21 21 48 24 30 21 - 89 0 0 23 3 51 9 41 5 34 110 -19 22 21 56 23 46 9 21 30 27 24 39 9 - 88 0 0 23 12 51 9 41 8 34 111 -18 22 30 54 23 55 11 21 39 22 24 48 13 - 87 0 0 23 22 8 9 41 11 35 111 -17 22 40 8 24 4 30 21 48 34 24 57 35 - 86 0 0 23 31 41 9 41 14 36 112 -16 22 49 40 24 14 6 21 58 3 25 7 14 - 85 0 0 23 41 31 9 41 17 37 113 -15 22 59 27 24 23 58 22 7 48 25 17 9 - 84 0 0 23 51 37 9 41 20 38 114 -14 23 9 31 24 34 6 22 17 49 25 27 20 - 83 0 0 24 1 59 9 41 24 38 114 -13 23 19 51 24 44 31 22 28 6 25 37 48 - 82 0 0 24 12 37 9 41 27 39 115 -13 23 30 26 24 55 11 22 38 39 25 48 31 - 81 0 0 24 23 31 9 41 31 40 116 -12 23 41 18 25 6 7 22 49 27 25 59 30 - 80 0 0 24 34 39 9 41 34 41 117 -11 23 52 24 25 17 18 23 0 31 26 10 44 - 79 0 0 24 46 3 9 41 38 41 118 -10 24 3 45 25 28 44 23 11 49 26 22 13 - 78 0 0 24 57 42 9 41 41 42 119 -9 24 15 21 25 40 25 23 23 23 26 33 57 - 77 0 0 25 9 35 9 41 45 43 120 -8 24 27 12 25 52 21 23 35 10 26 45 56 - 76 0 0 25 21 42 9 41 49 44 121 -7 24 39 17 26 4 31 23 47 12 26 58 9 - 75 0 0 25 34 4 9 41 52 44 122 -6 24 51 36 26 16 54 23 59 29 27 10 36 - 74 0 0 25 46 39 9 41 56 45 123 -5 25 4 9 26 29 32 24 11 58 27 23 17 - 73 0 0 25 59 27 9 42 0 46 124 -4 25 16 55 26 42 23 24 24 41 27 36 12 - 72 0 0 26 12 29 9 42 4 46 125 -4 25 29 54 26 55 27 24 37 38 27 49 19 - 71 0 0 26 25 44 9 42 8 47 127 -3 25 43 6 27 8 45 24 50 47 28 2 39 - 70 0 0 26 39 11 9 42 12 47 128 -2 25 56 31 27 22 14 25 4 9 28 16 12 - 69 0 0 26 52 50 9 42 16 48 129 -1 26 10 8 27 35 56 25 17 42 28 29 57 Uncertainty in time = +/- 3 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 4666-00002-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 02 53.0005 DE: -02 35 50.750 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .031, .032 ) * V mag [mag]: 12.2 * B mag [mag]: 13.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (28) Bellona approx. diameter [km]: 124 approx. diameter ["]: .053 distance from Earth [AU]: 3.22500 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1368 number of rejected observations: 158 time covered by the observations: 1900 Feb 08 - 2007 Jun 19 1 sigma uncertainty ellipse (major, minor, PA): 0.008, 0.006, 75° remarks: * orbital elements for (28) Bellona : Mean anomaly = 223.44573399 deg Arg. of pericenter = 344.04161555 deg Long. of node = 144.34418625 deg Inclination = 9.43064559 deg Eccentricity = 0.14964119 Semimajor axis = 2.77846193 AU Perihelion dist = 2.36268959 AU Mag: H = 7.06, G = 0.15 Epoch of elements : MJD 54986.40500000 TDT (2009 Jun 04.405) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 4 28 Bellona 9h 43.7m UT 12.2 0 2 53.001- 2 35 50.75TYC 4666-00002-1 13.4 13.0 124 5.2 3.225 2.365 9.42 -38.1767 -2.600 33.66 22.47 9.7286 -0.14951 0.56636 12.99728 3.45454 -0.00494 -0.00222 2000 222.0826692009 529.00000344.041616144.344186 9.4306460.14964119 2.7784619 2.3626896 7.1 5.00.15 RATE 2.1281260 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.032 360 1.62 0.033 0 54545.5020090604_0002-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 08:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org