IOTA/IOTA-ES occultation update for (117) Lomia / TYC 6127-00350-1 event on 2009 Jan 07, 00:53 UT Visible from Summary ------- On 2009 Jan 07 UT, the 145 km diameter asteroid (117) Lomia will occult a 11.1 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.8 mag to 13.8 mag (the magnitude of the asteroid) for at most 5.9 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: 97 * date and approx. time of event: 2009 Jan 07, 00:50 - 2009 Jan 07, 00:53 UT * magnitude of target star: 11.1 * magnitude drop [mag]: 2.8 * estimated maximum duration [s]: 5.9 * Moon: 77 % sunlit, 162° distance * Sun: 75° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 183 * 1 sigma uncertainty interval [path widths]: +/- 0.40 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .028", .024", 101° ) * approx speed of asteroid's shadow [km/s]: 24.4602 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6127-00350-1 by 117 Lomia on 2009 Jan 7 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 - 0 23 43 - 2 0 0 0 50 2 2 108 -64 ... .. .. 1 59 56 ... .. .. 3 46 38 2 17 8 - 3 0 0 0 50 3 5 108 -62 - 0 4 59 4 28 21 - 2 8 51 6 7 4 Latitude Latitude Latitude Latitude 3 0 0 - 3 17 9 0 50 3 5 108 -61 - 4 11 25 - 2 23 35 - 4 55 23 - 1 41 13 4 0 0 - 3 41 57 0 50 4 6 108 -60 - 4 36 33 - 2 48 5 - 5 20 47 - 2 5 29 5 0 0 - 4 7 44 0 50 5 8 108 -59 - 5 2 40 - 3 13 33 - 5 47 10 - 2 30 42 6 0 0 - 4 34 29 0 50 5 9 108 -58 - 5 29 46 - 3 39 58 - 6 14 34 - 2 56 51 7 0 0 - 5 2 13 0 50 6 10 107 -57 - 5 57 51 - 4 7 20 - 6 42 57 - 3 23 58 8 0 0 - 5 30 55 0 50 8 11 107 -57 - 6 26 56 - 4 35 41 - 7 12 21 - 3 52 2 9 0 0 - 6 0 37 0 50 9 12 107 -56 - 6 57 2 - 5 5 1 - 7 42 46 - 4 21 4 10 0 0 - 6 31 19 0 50 10 13 107 -55 - 7 28 7 - 5 35 19 - 8 14 12 - 4 51 4 11 0 0 - 7 3 0 0 50 12 14 107 -54 - 8 0 14 - 6 6 36 - 8 46 39 - 5 22 3 12 0 0 - 7 35 41 0 50 13 15 107 -53 - 8 33 21 - 6 38 53 - 9 20 8 - 5 54 1 13 0 0 - 8 9 23 0 50 15 16 106 -51 - 9 7 30 - 7 12 9 - 9 54 40 - 6 26 57 14 0 0 - 8 44 6 0 50 17 17 106 -50 - 9 42 41 - 7 46 25 -10 30 13 - 7 0 53 15 0 0 - 9 19 50 0 50 19 19 106 -49 -10 18 53 - 8 21 41 -11 6 50 - 7 35 48 16 0 0 - 9 56 34 0 50 21 20 106 -48 -10 56 7 - 8 57 57 -11 44 28 - 8 11 42 17 0 0 -10 34 19 0 50 24 21 105 -47 -11 34 23 - 9 35 14 -12 23 10 - 8 48 36 18 0 0 -11 13 6 0 50 26 22 105 -46 -12 13 41 -10 13 30 -13 2 54 - 9 26 30 19 0 0 -11 52 54 0 50 29 23 105 -45 -12 54 1 -10 52 47 -13 43 41 -10 5 23 20 0 0 -12 33 42 0 50 32 24 104 -44 -13 35 23 -11 33 4 -14 25 31 -10 45 15 21 0 0 -13 15 32 0 50 35 25 104 -43 -14 17 47 -12 14 21 -15 8 24 -11 26 7 22 0 0 -13 58 22 0 50 38 26 103 -41 -15 1 12 -12 56 38 -15 52 19 -12 7 58 23 0 0 -14 42 12 0 50 41 28 103 -40 -15 45 38 -13 39 54 -16 37 15 -12 50 48 24 0 0 -15 27 2 0 50 44 29 102 -39 -16 31 6 -14 24 9 -17 23 14 -13 34 37 25 0 0 -16 12 52 0 50 48 30 102 -38 -17 17 33 -15 9 22 -18 10 13 -14 19 23 26 0 0 -16 59 40 0 50 51 31 101 -36 -18 5 0 -15 55 34 -18 58 13 -15 5 7 27 0 0 -17 47 27 0 50 55 32 101 -35 -18 53 26 -16 42 43 -19 47 12 -15 51 47 28 0 0 -18 36 10 0 50 59 33 100 -34 -19 42 50 -17 30 48 -20 37 11 -16 39 23 29 0 0 -19 25 50 0 51 3 34 99 -33 -20 33 11 -18 19 49 -21 28 7 -17 27 54 30 0 0 -20 16 25 0 51 7 35 98 -31 -21 24 28 -19 9 44 -22 19 59 -18 17 19 31 0 0 -21 7 53 0 51 11 36 97 -30 -22 16 40 -20 0 32 -23 12 47 -19 7 36 32 0 0 -22 0 14 0 51 16 37 96 -29 -23 9 44 -20 52 12 -24 6 28 -19 58 45 33 0 0 -22 53 26 0 51 20 38 95 -28 -24 3 40 -21 44 42 -25 1 2 -20 50 44 34 0 0 -23 47 26 0 51 25 39 94 -26 -24 58 25 -22 38 1 -25 56 25 -21 43 30 35 0 0 -24 42 14 0 51 30 40 93 -25 -25 53 58 -23 32 6 -26 52 37 -22 37 4 36 0 0 -25 37 47 0 51 35 41 92 -24 -26 50 17 -24 26 56 -27 49 35 -23 31 21 37 0 0 -26 34 2 0 51 40 42 91 -22 -27 47 19 -25 22 28 -28 47 16 -24 26 21 38 0 0 -27 30 58 0 51 45 43 89 -21 -28 45 1 -26 18 40 -29 45 38 -25 22 0 39 0 0 -28 28 31 0 51 50 44 88 -20 -29 43 21 -27 15 30 -30 44 37 -26 18 17 40 0 0 -29 26 39 0 51 56 45 87 -18 -30 42 15 -28 12 55 -31 44 12 -27 15 9 41 0 0 -30 25 18 0 52 1 46 85 -17 -31 41 41 -29 10 51 -32 44 18 -28 12 33 42 0 0 -31 24 26 0 52 6 46 83 -16 -32 41 36 -30 9 15 -33 44 53 -29 10 25 43 0 0 -32 23 59 0 52 12 47 82 -15 -33 41 55 -31 8 5 -34 45 51 -30 8 43 44 0 0 -33 23 53 0 52 18 48 80 -13 -34 42 35 -32 7 17 -35 47 11 -31 7 23 45 0 0 -34 24 5 0 52 23 49 78 -12 -35 43 32 -33 6 48 -36 48 47 -32 6 22 46 0 0 -35 24 31 0 52 29 49 76 -11 -36 44 41 -34 6 32 -37 50 35 -33 5 36 47 0 0 -36 25 6 0 52 35 50 74 -9 -37 46 0 -35 6 28 -38 52 31 -34 5 2 48 0 0 -37 25 47 0 52 40 50 72 -8 -38 47 23 -36 6 29 -39 54 30 -35 4 35 49 0 0 -38 26 28 0 52 46 51 70 -7 -39 48 45 -37 6 34 -40 56 28 -36 4 11 50 0 0 -39 27 7 0 52 52 51 68 -6 -40 50 3 -38 6 36 -41 58 20 -37 3 46 51 0 0 -40 27 38 0 52 58 51 66 -4 -41 51 12 -39 6 32 -43 0 2 -38 3 17 52 0 0 -41 27 56 0 53 3 52 63 -3 -42 52 6 -40 6 18 -44 1 27 -39 2 39 53 0 0 -42 27 58 0 53 9 52 61 -2 -43 52 42 -41 5 49 -45 2 32 -40 1 47 54 0 0 -43 27 39 0 53 15 52 59 -1 -44 52 54 -42 5 2 -46 3 12 -41 0 38 Uncertainty in time = +/- 3 secs [Prediction of 2008 Nov 4.0] Data for the target star ------------------------ * name: TYC 6127-00350-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 13 50 13.3789 DE: -17 56 00.595 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .023 ) * V mag [mag]: 11.1 * B mag [mag]: 11.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (117) Lomia approx. diameter [km]: 145 approx. diameter ["]: .063 distance from Earth [AU]: 3.16500 * orbital information: orbit source: Preston date of fit: 2008 Nov 03 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 987 number of rejected observations: 72 time covered by the observations: 1900 Feb 26 - 2008 Jun 10 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.009, 122° remarks: * orbital elements for (117) Lomia : Mean anomaly = 142.31328844 deg Arg. of pericenter = 61.29594821 deg Long. of node = 348.97420150 deg Inclination = 14.93130935 deg Eccentricity = 0.02865861 Semimajor axis = 2.98984683 AU Perihelion dist = 2.90416198 AU Mag: H = 7.88, G = 0.15 Epoch of elements : MJD 54838.03700000 TDT (2009 Jan 07.037) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jan 7 117 Lomia 0h 53.5m UT 11.1 13 50 13.379-17 56 0.60TYC 6127-00350-1 11.9 13.8 145 5.9 3.165 2.167 -22.69 87.4595 -17.928 168.18 -22.38 0.8911 -0.36173 -0.49417 11.13347 -8.16408 -0.00548 0.00190 2000 140.78105620081230.00000 61.295948348.974201 14.9313090.02865861 2.9898468 2.9041620 8.0 5.00.15 RATE 1.9064730 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.028 0.024 101 1.40 0.025 0 54774.5020090107_0350-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 04, 05:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org