IOTA/IOTA-ES occultation update for (977) Philippa / TYC 2479-01869-1 event on 2009 Feb 02, 04:10 UT Visible from Summary ------- On 2009 Feb 02 UT, the 66 km diameter asteroid (977) Philippa will occult a 11.6 mag star in the constellation Lynx 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 14.3 mag (the magnitude of the asteroid) for at most 5.5 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: 70 * date and approx. time of event: 2009 Feb 02, 04:07 - 2009 Feb 02, 04:10 UT * magnitude of target star: 11.6 * magnitude drop [mag]: 2.8 * estimated maximum duration [s]: 5.5 * Moon: 41 % sunlit, 80° distance * Sun: 155° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 227 * 1 sigma uncertainty interval [path widths]: +/- 0.84 * 1 sigma uncertainty interval [seconds]: +/- 4.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .047 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .047", .035", 89° ) * approx speed of asteroid's shadow [km/s]: 11.8694 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2479-01869-1 by 977 Philippa on 2009 Feb 2 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 51 46 25 49 57 41 4 7 53 8 320 0 49 49 46 51 15 57 54 5 44 48 13 39 46 57 37 52 58 39 ... .. .. .. .. .. 51 32 29 50 46 53 4 7 57 9 319 -1 49 40 52 51 59 47 53 41 7 49 14 4 46 53 1 53 37 39 ... .. .. .. .. .. 51 22 33 51 32 51 4 8 1 10 319 -1 49 34 52 52 41 30 53 23 39 50 8 0 46 50 30 54 15 20 58 35 50 45 44 1 51 16 0 52 16 12 4 8 5 10 319 -2 49 31 26 53 21 24 53 11 27 50 57 21 46 49 58 54 51 50 57 30 44 47 29 24 51 12 23 52 57 22 4 8 10 11 319 -2 49 30 24 53 59 43 53 3 29 51 43 12 46 51 19 55 27 14 56 56 57 48 42 43 51 11 26 53 36 39 4 8 14 11 319 -2 49 31 33 54 36 37 52 59 3 52 26 16 46 54 29 56 1 39 56 35 57 49 43 27 51 12 55 54 14 18 4 8 18 12 319 -2 49 34 48 55 12 16 52 57 42 53 7 1 46 59 25 56 35 8 56 22 48 50 36 50 51 16 39 54 50 31 4 8 22 12 319 -3 49 40 1 55 46 45 52 59 6 53 45 48 47 6 3 57 7 45 56 15 17 51 25 11 51 22 32 55 25 25 4 8 26 12 319 -3 49 47 10 56 20 11 53 3 1 54 22 52 47 14 24 57 39 35 56 12 12 52 9 46 51 30 28 55 59 8 4 8 30 13 319 -3 49 56 10 56 52 38 53 9 16 54 58 25 47 24 24 58 10 38 56 12 48 52 51 22 51 40 22 56 31 45 4 8 34 13 319 -3 50 7 0 57 24 10 53 17 44 55 32 36 47 36 5 58 40 58 56 16 35 53 30 30 51 52 10 57 3 20 4 8 39 13 319 -3 50 19 36 57 54 50 53 28 19 56 5 32 47 49 24 59 10 35 56 23 14 54 7 33 52 5 51 57 33 59 4 8 43 14 319 -3 50 33 59 58 24 41 53 40 55 56 37 18 48 4 23 59 39 33 56 32 30 54 42 47 52 21 23 58 3 43 4 8 47 14 319 -3 50 50 8 58 53 44 53 55 30 57 8 1 48 21 3 60 7 51 56 44 11 55 16 23 52 38 44 58 32 35 4 8 51 14 319 -4 51 8 1 59 22 1 54 12 0 57 37 42 48 39 22 60 35 32 56 58 9 55 48 32 52 57 53 59 0 37 4 8 55 14 319 -4 51 27 40 59 49 34 54 30 24 58 6 26 48 59 23 61 2 35 57 14 19 56 19 20 53 18 50 59 27 50 4 8 59 15 320 -4 51 49 3 60 16 24 54 50 40 58 34 15 49 21 7 61 29 1 57 32 34 56 48 54 53 41 35 59 54 17 4 9 3 15 320 -4 52 12 13 60 42 32 55 12 47 59 1 10 49 44 34 61 54 51 57 52 52 57 17 17 54 6 8 60 19 58 4 9 8 15 320 -4 52 37 9 61 7 58 55 36 44 59 27 14 50 9 47 62 20 5 58 15 9 57 44 34 54 32 29 60 44 53 4 9 12 15 320 -4 53 3 52 61 32 43 56 2 31 59 52 28 50 36 46 62 44 44 58 39 23 58 10 47 55 0 38 61 9 4 4 9 16 15 321 -4 53 32 23 61 56 47 56 30 8 60 16 52 51 5 34 63 8 46 59 5 31 58 35 59 55 30 37 61 32 30 4 9 20 16 321 -4 54 2 43 62 20 10 56 59 34 60 40 28 51 36 12 63 32 12 59 33 33 59 0 11 56 2 25 61 55 13 4 9 24 16 321 -4 54 34 54 62 42 52 57 30 50 61 3 14 52 8 41 63 55 2 60 3 28 59 23 25 56 36 3 62 17 10 4 9 28 16 322 -4 55 8 55 63 4 54 58 3 56 61 25 13 52 43 4 64 17 16 60 35 13 59 45 41 57 11 32 62 38 23 4 9 32 16 322 -3 55 44 49 63 26 13 58 38 52 61 46 24 53 19 23 64 38 51 61 8 48 60 7 0 57 48 52 62 58 52 4 9 37 16 323 -3 56 22 36 63 46 51 59 15 37 62 6 46 53 57 39 64 59 50 61 44 12 60 27 23 58 28 4 63 18 34 4 9 41 16 323 -3 57 2 18 64 6 46 59 54 12 62 26 19 54 37 53 65 20 9 62 21 24 60 46 50 59 9 9 63 37 31 4 9 45 16 324 -3 57 43 54 64 25 57 60 34 37 62 45 2 55 20 8 65 39 49 63 0 24 61 5 20 59 52 6 63 55 40 4 9 49 16 324 -3 58 27 27 64 44 24 61 16 52 63 2 56 56 4 24 65 58 48 63 41 9 61 22 53 60 36 55 64 13 2 4 9 53 16 325 -3 59 12 55 65 2 6 62 0 56 63 19 59 56 50 44 66 17 6 64 23 40 61 39 28 61 23 37 64 29 35 4 9 57 16 325 -3 60 0 20 65 19 2 62 46 48 63 36 10 57 39 7 66 34 41 65 7 55 61 55 5 62 12 11 64 45 18 4 10 1 16 326 -3 60 49 41 65 35 9 63 34 29 63 51 28 58 29 35 66 51 32 65 53 52 62 9 43 63 2 35 65 0 9 4 10 6 16 327 -3 61 40 58 65 50 28 64 23 56 64 5 51 59 22 9 67 7 37 66 41 30 62 23 20 63 54 50 65 14 7 4 10 10 16 327 -2 62 34 11 66 4 57 65 15 8 64 19 20 60 16 47 67 22 56 67 30 46 62 35 55 64 48 54 65 27 12 4 10 14 16 328 -2 63 29 18 66 18 34 66 8 4 64 31 51 61 13 30 67 37 26 68 21 38 62 47 27 65 44 44 65 39 20 4 10 18 16 329 -2 64 26 17 66 31 17 67 2 40 64 43 23 62 12 16 67 51 6 69 14 4 62 57 54 66 42 18 65 50 32 4 10 22 16 329 -2 65 25 7 66 43 5 67 58 56 64 53 56 63 13 6 68 3 54 70 8 0 63 7 15 67 41 34 66 0 44 4 10 26 16 330 -2 66 25 46 66 53 57 68 56 47 65 3 26 64 15 55 68 15 49 71 3 24 63 15 27 68 42 28 66 9 54 4 10 30 16 331 -1 67 28 9 67 3 49 69 56 10 65 11 52 65 20 42 68 26 48 72 0 11 63 22 28 69 44 57 66 18 2 4 10 34 16 332 -1 68 32 13 67 12 41 70 57 2 65 19 13 66 27 24 68 36 49 72 58 17 63 28 17 70 48 55 66 25 5 4 10 39 16 333 -1 69 37 55 67 20 30 71 59 16 65 25 25 67 35 56 68 45 52 73 57 38 63 32 49 71 54 19 66 31 0 4 10 43 16 334 -1 70 45 8 67 27 15 73 2 50 65 30 27 68 46 14 68 53 52 74 58 9 63 36 4 73 1 1 66 35 46 4 10 47 16 334 0 71 53 48 67 32 53 74 7 36 65 34 16 69 58 13 69 0 49 75 59 45 63 37 57 74 8 57 66 39 20 4 10 51 16 335 0 73 3 48 67 37 21 75 13 30 65 36 49 71 11 45 69 6 40 77 2 19 63 38 26 Uncertainty in time = +/- 6 secs [Prediction of 2008 Nov 6.0] Data for the target star ------------------------ * name: TYC 2479-01869-1 * constellation : Lynx * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 56 07.7784 DE: +36 34 11.327 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .030, .029 ) * V mag [mag]: 11.6 * B mag [mag]: 12.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (977) Philippa approx. diameter [km]: 66 approx. diameter ["]: .043 distance from Earth [AU]: 2.12100 * orbital information: orbit source: Preston date of fit: 2008 Nov 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 653 number of rejected observations: 51 time covered by the observations: 1914 Dec 19 - 2008 Mar 10 1 sigma uncertainty ellipse (major, minor, PA): 0.036, 0.019, 88° remarks: * orbital elements for (977) Philippa : Mean anomaly = 324.96530576 deg Arg. of pericenter = 82.27120025 deg Long. of node = 75.90370371 deg Inclination = 15.19726005 deg Eccentricity = 0.02887081 Semimajor axis = 3.11759690 AU Perihelion dist = 3.02758935 AU Mag: H = 9.76, G = 0.15 Epoch of elements : MJD 54864.17400000 TDT (2009 Feb 02.174) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Feb 2 977 Philippa 4h 10.1m UT 11.6 7 56 7.778 36 34 11.33TYC 2479-01869-1 12.4 14.3 66 5.5 2.121 -2.204 8.09 -75.9822 36.569 120.91 -16.78 4.1682 0.27876 0.91529 -6.40786 1.95486 0.00169 -0.00189 2000 324.2179522009 129.00000 82.271200 75.903704 15.1972600.02887081 3.1175969 3.0275894 9.7 5.00.15 RATE 1.7904990 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.047 0.035 89 1.84 0.036 0 54776.5020090202_1869-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 06, 04:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org