IOTA/IOTA-ES occultation update for (809) Lundia / TYC 5731-02761-1 event on 2008 May 12, 22:33 UT Visible from Africa, Madagascar Summary ------- On 2008 May 12 UT, the 15 km diameter asteroid (809) Lundia will occult a 10.5 mag star in the constellation Sagittarius for observers along a path across Africa, Madagascar. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.9 mag to 15.4 mag (the magnitude of the asteroid) for at most 2.2 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: 31 * date and approx. time of event: 2008 May 12, 22:18 - 2008 May 12, 22:42 UT * midpoint of event [JD]: 2454599.44045 * magnitude of target star: 10.5 * magnitude drop [mag]: 4.9 * estimated maximum duration [s]: 2.2 * Moon: 58 % sunlit, 142° distance * Sun: 118° distance * rough path description: Africa, Madagascar The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 2.14 * 1 sigma uncertainty interval [seconds]: +/- 5.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .028", 89° ) * approx speed of asteroid's shadow [km/s]: 6.7103 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5731-02761-1 by 809 Lundia on 2008 May 12 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 - 5 0 0 -15 26 13 22 18 41 0 102 -62 -15 30 27 -15 21 59 -15 48 31 .. .. .. - 4 0 0 -15 38 45 22 18 41 1 102 -63 -15 42 59 -15 34 32 -16 1 1 -15 16 28 - 3 0 0 -15 50 49 22 18 41 2 102 -64 -15 55 2 -15 46 36 -16 13 3 -15 28 33 - 2 0 0 -16 2 23 22 18 42 3 102 -65 -16 6 36 -15 58 11 -16 24 35 -15 40 10 - 1 0 0 -16 13 29 22 18 43 4 101 -66 -16 17 41 -16 9 17 -16 35 39 -15 51 17 0 0 0 -16 24 5 22 18 44 5 101 -67 -16 28 16 -16 19 53 -16 46 13 -16 1 55 1 0 0 -16 34 12 22 18 46 6 101 -68 -16 38 23 -16 30 0 -16 56 18 -16 12 4 2 0 0 -16 43 49 22 18 48 7 100 -69 -16 48 0 -16 39 38 -17 5 54 -16 21 43 3 0 0 -16 52 57 22 18 50 8 100 -70 -16 57 7 -16 48 46 -17 15 0 -16 30 52 4 0 0 -17 1 35 22 18 52 9 100 -70 -17 5 45 -16 57 24 -17 23 36 -16 39 32 5 0 0 -17 9 43 22 18 55 10 100 -71 -17 13 53 -17 5 33 -17 31 43 -16 47 42 6 0 0 -17 17 22 22 18 58 11 99 -72 -17 21 32 -17 13 12 -17 39 21 -16 55 21 7 0 0 -17 24 31 22 19 1 12 99 -73 -17 28 40 -17 20 21 -17 46 28 -17 2 31 8 0 0 -17 31 9 22 19 5 13 99 -74 -17 35 19 -17 27 0 -17 53 6 -17 9 11 9 0 0 -17 37 18 22 19 8 14 98 -75 -17 41 27 -17 33 9 -17 59 13 -17 15 21 10 0 0 -17 42 56 22 19 12 15 98 -76 -17 47 5 -17 38 47 -18 4 51 -17 21 0 11 0 0 -17 48 5 22 19 17 16 98 -77 -17 52 13 -17 43 56 -18 9 58 -17 26 10 12 0 0 -17 52 42 22 19 21 17 98 -78 -17 56 51 -17 48 34 -18 14 35 -17 30 48 13 0 0 -17 56 50 22 19 26 18 97 -79 -18 0 58 -17 52 41 -18 18 42 -17 34 56 14 0 0 -18 0 27 22 19 31 19 97 -80 -18 4 35 -17 56 18 -18 22 18 -17 38 34 15 0 0 -18 3 33 22 19 37 20 97 -81 -18 7 41 -17 59 24 -18 25 24 -17 41 41 16 0 0 -18 6 8 22 19 42 21 96 -82 -18 10 17 -18 2 0 -18 27 59 -17 44 17 17 0 0 -18 8 13 22 19 48 22 96 -83 -18 12 21 -18 4 5 -18 30 3 -17 46 22 18 0 0 -18 9 47 22 19 54 22 96 -84 -18 13 55 -18 5 39 -18 31 37 -17 47 56 19 0 0 -18 10 50 22 20 1 23 96 -85 -18 14 58 -18 6 42 -18 32 40 -17 48 59 20 0 0 -18 11 22 22 20 8 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52 20 -17 8 19 34 0 0 -17 23 26 22 22 9 38 92 -80 -17 27 36 -17 19 15 -17 45 28 -17 1 23 35 0 0 -17 15 59 22 22 19 39 92 -79 -17 20 10 -17 11 48 -17 38 2 -16 53 54 36 0 0 -17 7 59 22 22 30 40 91 -78 -17 12 10 -17 3 48 -17 30 4 -16 45 52 37 0 0 -16 59 26 22 22 41 41 91 -77 -17 3 38 -16 55 15 -17 21 33 -16 37 17 38 0 0 -16 50 20 22 22 53 42 91 -76 -16 54 32 -16 46 8 -17 12 29 -16 28 9 39 0 0 -16 40 41 22 23 4 43 91 -75 -16 44 53 -16 36 29 -17 2 52 -16 18 28 40 0 0 -16 30 28 22 23 16 44 91 -74 -16 34 41 -16 26 16 -16 52 42 -16 8 13 41 0 0 -16 19 43 22 23 28 45 91 -73 -16 23 56 -16 15 29 -16 41 58 -15 57 25 42 0 0 -16 8 23 22 23 41 46 91 -72 -16 12 37 -16 4 10 -16 30 42 -15 46 3 43 0 0 -15 56 30 22 23 53 47 91 -71 -16 0 44 -15 52 16 -16 18 51 -15 34 8 44 0 0 -15 44 4 22 24 6 48 91 -70 -15 48 18 -15 39 49 -16 6 27 -15 21 38 45 0 0 -15 31 3 22 24 19 49 91 -69 -15 35 18 -15 26 48 -15 53 29 -15 8 35 46 0 0 -15 17 29 22 24 33 50 91 -68 -15 21 44 -15 13 13 -15 39 58 -14 54 57 47 0 0 -15 3 20 22 24 47 51 91 -67 -15 7 36 -14 59 4 -15 25 52 -14 40 46 48 0 0 -14 48 38 22 25 1 52 91 -66 -14 52 55 -14 44 21 -15 11 13 -14 26 1 49 0 0 -14 33 21 22 25 15 53 91 -65 -14 37 39 -14 29 4 -14 56 0 -14 10 41 50 0 0 -14 17 30 22 25 29 54 91 -63 -14 21 48 -14 13 12 -14 40 12 -13 54 47 51 0 0 -14 1 5 22 25 44 55 91 -62 -14 5 24 -13 56 47 -14 23 51 -13 38 18 52 0 0 -13 44 6 22 25 59 56 91 -61 -13 48 26 -13 39 47 -14 6 55 -13 21 16 53 0 0 -13 26 33 22 26 14 57 91 -60 -13 30 53 -13 22 13 -13 49 25 -13 3 39 54 0 0 -13 8 25 22 26 29 58 92 -59 -13 12 46 -13 4 4 -13 31 21 -12 45 27 55 0 0 -12 49 43 22 26 45 59 92 -58 -12 54 5 -12 45 22 -13 12 43 -12 26 42 56 0 0 -12 30 27 22 27 1 60 92 -57 -12 34 49 -12 26 5 -12 53 30 -12 7 22 57 0 0 -12 10 37 22 27 17 62 93 -56 -12 14 59 -12 6 14 -12 33 44 -11 47 27 58 0 0 -11 50 12 22 27 33 63 93 -55 -11 54 36 -11 45 48 -12 13 23 -11 26 59 59 0 0 -11 29 14 22 27 50 64 94 -54 -11 33 38 -11 24 49 -11 52 29 -11 5 56 60 0 0 -11 7 41 22 28 7 65 95 -53 -11 12 6 -11 3 16 -11 31 0 -10 44 20 61 0 0 -10 45 35 22 28 24 66 95 -52 -10 50 1 -10 41 9 -11 8 58 -10 22 10 62 0 0 -10 22 55 22 28 41 67 96 -50 -10 27 22 -10 18 29 -10 46 23 - 9 59 26 63 0 0 - 9 59 42 22 28 59 68 97 -49 -10 4 10 - 9 55 15 -10 23 14 - 9 36 8 64 0 0 - 9 35 56 22 29 16 69 98 -48 - 9 40 24 - 9 31 27 - 9 59 32 - 9 12 18 65 0 0 - 9 11 37 22 29 34 70 100 -47 - 9 16 6 - 9 7 7 - 9 35 17 - 8 47 54 66 0 0 - 8 46 45 22 29 52 71 101 -46 - 8 51 14 - 8 42 15 - 9 10 29 - 8 22 58 67 0 0 - 8 21 20 22 30 11 72 103 -45 - 8 25 51 - 8 16 49 - 8 45 9 - 7 57 29 68 0 0 - 7 55 24 22 30 29 72 105 -44 - 7 59 55 - 7 50 52 - 8 19 17 - 7 31 29 69 0 0 - 7 28 56 22 30 48 73 107 -42 - 7 33 28 - 7 24 23 - 7 52 53 - 7 4 56 70 0 0 - 7 1 57 22 31 7 74 110 -41 - 7 6 30 - 6 57 23 - 7 25 58 - 6 37 53 71 0 0 - 6 34 27 22 31 26 75 112 -40 - 6 39 1 - 6 29 53 - 6 58 33 - 6 10 19 72 0 0 - 6 6 27 22 31 45 76 116 -39 - 6 11 1 - 6 1 52 - 6 30 37 - 5 42 14 73 0 0 - 5 37 57 22 32 4 77 119 -38 - 5 42 32 - 5 33 21 - 6 2 11 - 5 13 40 74 0 0 - 5 8 58 22 32 23 77 123 -37 - 5 13 34 - 5 4 21 - 5 33 16 - 4 44 37 75 0 0 - 4 39 30 22 32 43 78 128 -35 - 4 44 8 - 4 34 53 - 5 3 53 - 4 15 5 76 0 0 - 4 9 35 22 33 2 78 133 -34 - 4 14 13 - 4 4 57 - 4 34 2 - 3 45 6 77 0 0 - 3 39 13 22 33 22 79 138 -33 - 3 43 51 - 3 34 34 - 4 3 44 - 3 14 39 78 0 0 - 3 8 24 22 33 42 79 144 -32 - 3 13 3 - 3 3 44 - 3 32 59 - 2 43 47 79 0 0 - 2 37 10 22 34 2 79 150 -31 - 2 41 50 - 2 32 29 - 3 1 48 - 2 12 28 80 0 0 - 2 5 31 22 34 22 79 157 -30 - 2 10 11 - 2 0 49 - 2 30 13 - 1 40 46 81 0 0 - 1 33 28 22 34 42 79 163 -28 - 1 38 9 - 1 28 46 - 1 58 14 - 1 8 39 82 0 0 - 1 1 2 22 35 2 79 169 -27 - 1 5 44 - 0 56 19 - 1 25 52 - 0 36 10 83 0 0 - 0 28 14 22 35 22 78 175 -26 - 0 32 57 - 0 23 31 - 0 53 8 - 0 3 19 84 0 0 0 4 54 22 35 42 78 180 -25 0 0 11 0 9 38 - 0 20 2 0 29 53 85 0 0 0 38 23 22 36 2 77 185 -23 0 33 39 0 43 7 0 13 23 1 3 25 86 0 0 1 12 10 22 36 22 77 189 -22 1 7 25 1 16 55 0 47 7 1 37 15 87 0 0 1 46 15 22 36 42 76 193 -21 1 41 29 1 51 0 1 21 9 2 11 23 88 0 0 2 20 36 22 37 2 75 197 -20 2 15 50 2 25 22 1 55 27 2 45 47 89 0 0 2 55 13 22 37 22 74 200 -19 2 50 26 2 59 59 2 30 1 3 20 26 90 0 0 3 30 3 22 37 42 73 203 -17 3 25 16 3 34 50 3 4 49 3 55 19 91 0 0 4 5 6 22 38 2 72 205 -16 4 0 19 4 9 54 3 39 50 4 30 25 92 0 0 4 40 21 22 38 21 71 207 -15 4 35 33 4 45 9 4 15 3 5 5 41 93 0 0 5 15 46 22 38 41 70 209 -14 5 10 58 5 20 34 4 50 26 5 41 8 94 0 0 5 51 20 22 39 0 69 211 -13 5 46 31 5 56 8 5 25 58 6 16 44 95 0 0 6 27 1 22 39 20 68 213 -11 6 22 12 6 31 50 6 1 38 6 52 27 96 0 0 7 2 49 22 39 39 67 214 -10 6 58 0 7 7 38 6 37 24 7 28 15 97 0 0 7 38 41 22 39 58 66 216 -9 7 33 52 7 43 30 7 13 15 8 4 9 98 0 0 8 14 36 22 40 17 65 217 -8 8 9 47 8 19 26 7 49 10 8 40 5 99 0 0 8 50 34 22 40 35 64 218 -7 8 45 45 8 55 24 8 25 7 9 16 4 100 0 0 9 26 33 22 40 54 63 219 -5 9 21 43 9 31 22 9 1 5 9 52 2 101 0 0 10 2 30 22 41 12 61 220 -4 9 57 41 10 7 20 9 37 2 10 28 0 102 0 0 10 38 26 22 41 30 60 221 -3 10 33 36 10 43 16 10 12 58 11 3 56 103 0 0 11 14 18 22 41 47 59 222 -2 11 9 29 11 19 8 10 48 50 11 39 48 104 0 0 11 50 6 22 42 5 58 223 -1 11 45 16 11 54 55 11 24 38 12 15 35 Uncertainty in time = +/- 6 secs [Prediction of 2008 Mar 29.0] Data for the target star ------------------------ * name: TYC 5731-02761-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 35 32.2873 DE: -11 58 39.417 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .020 ) * V mag [mag]: 10.5 * B mag [mag]: 11.5 * Apparent position with proper motion RA(deg): 294.0062324427 DE(deg): -11.9605300119 * Equation of equinoxes (radians) : 0.000041114054529 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (809) Lundia approx. diameter [km]: 15 approx. diameter ["]: .014 distance from Earth [AU]: 1.46800 * orbital information: orbit source: Preston date of fit: 2008 Mar 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 945 number of rejected observations: 44 time covered by the observations: 1915 Aug 15 - 2007 Jun 08 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.020, 88° remarks: * orbital elements for (809) Lundia : Mean anomaly = 299.40651312 deg Arg. of pericenter = 196.11819390 deg Long. of node = 154.65770914 deg Inclination = 7.14392510 deg Eccentricity = 0.19260422 Semimajor axis = 2.28358290 AU Perihelion dist = 1.84375519 AU Mag: H = 12.17, G = 0.15 Epoch of elements : MJD 54598.94000000 TDT (2008 May 12.940) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 12 809 Lundia 22h 34.2m UT 10.5 19 35 32.287-11 58 39.42TYC 5731-02761-1 11.5 15.4 15 2.2 1.468 1.383 10.11 84.2583 -11.980 -159.47 18.41 22.5708 -0.08228 0.16782 3.39082 1.68735 -0.00448 -0.00117 2000 296.8531272008 5 4.00000196.118194154.657709 7.1439250.19260422 2.2835829 1.843755211.8 5.00.15 RATE 2.8561360 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.038 0.028 89 3.14 0.030 1 6 12 54554.5020080512_2761-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 31, 04:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org