IOTA/IOTA-ES occultation update for (3550) Link / TYC 7391-01427-1 event on 2009 Aug 04, 15:26 UT Visible from Summary ------- On 2009 Aug 04 UT, the 26 km diameter asteroid (3550) Link will occult a 9.0 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.3 mag to 17.3 mag (the magnitude of the asteroid) for at most 3.3 seconds. This update is based on historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 14 * date and approx. time of event: 2009 Aug 04, 15:13 - 2009 Aug 04, 15:36 UT * magnitude of target star: 9.0 * magnitude drop [mag]: 8.3 * estimated maximum duration [s]: 3.3 * Moon: 98 % sunlit, 26° distance * Sun: 139° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 26 * 1 sigma uncertainty interval [path widths]: +/- 4.77 * 1 sigma uncertainty interval [seconds]: +/- 17.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .093 +/- .062) * 1 sigma uncertainty ellipse (major, minor, PA): ( .095", .059", 105° ) * approx speed of asteroid's shadow [km/s]: 8.0829 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7391-01427-1 by 3550 Link on 2009 Aug 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 28 0 0 -30 4 31 15 36 3 42 106 -1 -29 57 8 -30 11 55 -28 46 36 -31 22 31 29 0 0 -30 21 3 15 35 55 42 105 -1 -30 13 40 -30 28 25 -29 3 18 -31 38 51 30 0 0 -30 37 5 15 35 47 43 105 -2 -30 29 44 -30 44 27 -29 19 32 -31 54 42 31 0 0 -30 52 39 15 35 38 44 104 -3 -30 45 18 -30 59 59 -29 35 16 -32 10 5 32 0 0 -31 7 44 15 35 30 45 104 -4 -31 0 24 -31 15 3 -29 50 32 -32 24 59 33 0 0 -31 22 20 15 35 21 46 103 -5 -31 15 1 -31 29 38 -30 5 19 -32 39 25 34 0 0 -31 36 28 15 35 13 47 103 -6 -31 29 10 -31 43 45 -30 19 37 -32 53 23 35 0 0 -31 50 7 15 35 4 48 102 -7 -31 42 51 -31 57 24 -30 33 26 -33 6 52 36 0 0 -32 3 19 15 34 56 48 102 -7 -31 56 3 -32 10 34 -30 46 47 -33 19 54 37 0 0 -32 16 2 15 34 47 49 101 -8 -32 8 47 -32 23 17 -30 59 40 -33 32 28 38 0 0 -32 28 18 15 34 38 50 101 -9 -32 21 4 -32 35 32 -31 12 4 -33 44 35 39 0 0 -32 40 6 15 34 29 51 100 -10 -32 32 53 -32 47 19 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-76 -11 18 58 -11 35 20 -10 0 54 -12 53 27 147 0 0 -10 52 9 15 15 19 34 240 -75 -10 43 57 -11 0 21 - 9 25 46 -12 18 36 148 0 0 -10 16 53 15 15 10 33 240 -74 -10 8 41 -10 25 6 - 8 50 22 -11 43 28 149 0 0 - 9 41 21 15 15 2 31 240 -73 - 9 33 8 - 9 49 35 - 8 14 42 -11 8 4 150 0 0 - 9 5 34 15 14 54 30 240 -71 - 8 57 20 - 9 13 48 - 7 38 48 -10 32 24 151 0 0 - 8 29 33 15 14 47 29 239 -70 - 8 21 18 - 8 37 47 - 7 2 40 - 9 56 29 152 0 0 - 7 53 18 15 14 39 28 239 -69 - 7 45 3 - 8 1 34 - 6 26 19 - 9 20 21 153 0 0 - 7 16 52 15 14 32 27 239 -68 - 7 8 36 - 7 25 7 - 5 49 47 - 8 43 59 154 0 0 - 6 40 13 15 14 25 26 239 -67 - 6 31 57 - 6 48 30 - 5 13 4 - 8 7 27 155 0 0 - 6 3 25 15 14 18 25 239 -66 - 5 55 8 - 6 11 42 - 4 36 10 - 7 30 43 156 0 0 - 5 26 28 15 14 12 23 239 -65 - 5 18 10 - 5 34 45 - 3 59 9 - 6 53 49 157 0 0 - 4 49 22 15 14 6 22 239 -63 - 4 41 4 - 4 57 39 - 3 21 59 - 6 16 47 158 0 0 - 4 12 9 15 14 0 21 239 -62 - 4 3 51 - 4 20 27 - 2 44 43 - 5 39 37 159 0 0 - 3 34 50 15 13 54 20 239 -61 - 3 26 32 - 3 43 8 - 2 7 22 - 5 2 21 160 0 0 - 2 57 26 15 13 49 19 239 -60 - 2 49 8 - 3 5 44 - 1 29 56 - 4 24 59 161 0 0 - 2 19 58 15 13 44 18 238 -59 - 2 11 40 - 2 28 16 - 0 52 27 - 3 47 32 162 0 0 - 1 42 28 15 13 39 17 238 -58 - 1 34 9 - 1 50 46 - 0 14 55 - 3 10 3 163 0 0 - 1 4 56 15 13 35 15 238 -57 - 0 56 37 - 1 13 14 0 22 37 - 2 32 31 164 0 0 - 0 27 24 15 13 31 14 238 -55 - 0 19 5 - 0 35 42 1 0 9 - 1 54 59 165 0 0 0 10 8 15 13 27 13 238 -54 0 18 26 0 1 49 1 37 39 - 1 17 26 166 0 0 0 47 37 15 13 23 12 238 -53 0 55 55 0 39 19 2 15 7 - 0 39 55 167 0 0 1 25 3 15 13 20 11 238 -52 1 33 21 1 16 45 2 52 30 - 0 2 27 168 0 0 2 2 25 15 13 17 10 238 -51 2 10 42 1 54 7 3 29 49 0 34 57 169 0 0 2 39 41 15 13 15 8 238 -50 2 47 58 2 31 23 4 7 2 1 12 17 170 0 0 3 16 50 15 13 13 7 239 -48 3 25 7 3 8 33 4 44 7 1 49 30 171 0 0 3 53 52 15 13 11 6 239 -47 4 2 8 3 45 35 5 21 4 2 26 36 172 0 0 4 30 44 15 13 9 5 239 -46 4 39 0 4 22 28 5 57 51 3 3 34 173 0 0 5 7 26 15 13 8 4 239 -45 5 15 41 4 59 10 6 34 28 3 40 22 174 0 0 5 43 57 15 13 7 3 239 -44 5 52 11 5 35 42 7 10 52 4 16 59 175 0 0 6 20 15 15 13 7 1 239 -43 6 28 29 6 12 1 7 47 3 4 53 24 176 0 0 6 56 19 15 13 7 0 239 -41 7 4 33 6 48 6 .. .. .. 5 29 36 Uncertainty in time = +/- 22 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 7391-01427-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 07 21.5989 DE: -30 39 49.406 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .023 ) * V mag [mag]: 9.0 * B mag [mag]: 8.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3550) Link approx. diameter [km]: 26 approx. diameter ["]: .014 distance from Earth [AU]: 2.55600 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: MPC (via Astdys) number of used observations: 601 number of rejected observations: 28 time covered by the observations: 1961 Dec 06 - 2008 Mar 14 1 sigma uncertainty ellipse (major, minor, PA): 0.092, 0.055, 106° remarks: * orbital elements for (3550) Link : Mean anomaly = 171.98108966 deg Arg. of pericenter = 27.94057730 deg Long. of node = 81.51750577 deg Inclination = 14.67684684 deg Eccentricity = 0.15863585 Semimajor axis = 2.92583007 AU Perihelion dist = 2.46168854 AU Mag: H = 11.59, G = 0.15 Epoch of elements : MJD 55047.64300000 TDT (2009 Aug 04.643) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Aug 4 3550 Link 15h 26.3m UT 9.0 18 7 21.599-30 39 49.41TYC 7391-01427-1 8.9 17.3 26 3.3 2.556 -1.193 -2.95 86.9474 -30.663 -50.04 17.09 15.4376 0.00782 -0.04579 -4.48092 -0.85756 0.00369 0.00059 2000 170.4758902009 728.00000 27.940577 81.517506 14.6768470.15863585 2.9258301 2.461688511.9 5.00.15 RATE 1.9693840 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.095 0.059 105 5.77 0.067 0 54581.5020090804_1427-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 07:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org