IOTA/IOTA-ES occultation update for (2717) Tellervo / TYC 6269-01434-1 event on 2012 Jul 13, 16:36 UT Visible from N Australia, Africa Summary ------- On 2012 Jul 13 UT, the 10 km diameter asteroid (2717) Tellervo will occult a 9.9 mag star in the constellation Sagittarius for observers along a path across N Australia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.3 mag to 14.2 mag (the magnitude of the asteroid) for at most 1.9 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: 23 * date and approx. time of event: 2012 Jul 13, 16:16 - 2012 Jul 13, 16:55 UT * geocentric midpoint of event [JD]: 2456122.19180417 * magnitude of target star: 9.9 * magnitude drop [mag]: 4.3 * estimated maximum duration [s]: 1.9 * Moon: 26 % sunlit, 135° distance * Sun: 162° distance * rough path description: N Australia, Africa The occultation path -------------------- * approximate projected width [km]: 10 * 1 sigma uncertainty interval [path widths]: +/- 2.97 * 1 sigma uncertainty interval [seconds]: +/- 6.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .062 +/- .050) * 1 sigma uncertainty ellipse (major, minor, PA): ( .062", .050", 88° ) * approx speed of asteroid's shadow [km/s]: 5.2442 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6269-01434-1 by 2717 Tellervo on 2012 Jul 13 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 9 0 0 -22 27 35 16 55 38 15 102 -1 -22 24 47 -22 30 23 -22 8 9 -22 47 2 10 0 0 -22 41 10 16 55 32 16 102 -2 -22 38 22 -22 43 58 -22 21 45 -23 0 35 11 0 0 -22 54 26 16 55 26 17 102 -3 -22 51 38 -22 57 14 -22 35 3 -23 13 50 12 0 0 -23 7 23 16 55 20 18 101 -3 -23 4 35 -23 10 10 -22 48 1 -23 26 46 13 0 0 -23 20 1 16 55 14 19 101 -4 -23 17 14 -23 22 48 -23 0 40 -23 39 22 14 0 0 -23 32 20 16 55 8 20 101 -5 -23 29 33 -23 35 7 -23 13 0 -23 51 40 15 0 0 -23 44 20 16 55 1 21 100 -6 -23 41 33 -23 47 6 -23 25 1 -24 3 38 16 0 0 -23 56 0 16 54 54 22 100 -7 -23 53 14 -23 58 47 -23 36 43 -24 15 18 17 0 0 -24 7 22 16 54 46 23 99 -8 -24 4 35 -24 10 8 -23 48 6 -24 26 38 18 0 0 -24 18 24 16 54 39 24 99 -9 -24 15 38 -24 21 11 -23 59 10 -24 37 40 19 0 0 -24 29 8 16 54 31 25 98 -10 -24 26 22 -24 31 54 -24 9 55 -24 48 22 20 0 0 -24 39 32 16 54 23 25 98 -11 -24 36 46 -24 42 18 -24 20 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-21 4 59 15 4 53 32 5 16 15 4 36 31 -177 0 0 5 15 54 16 16 6 4 252 -20 5 18 45 5 13 2 5 35 44 4 56 3 -176 0 0 5 35 12 16 16 5 3 253 -19 5 38 3 5 32 21 5 55 1 5 15 22 -175 0 0 5 54 17 16 16 4 2 253 -18 5 57 8 5 51 26 6 14 5 5 34 28 -174 0 0 6 13 9 16 16 3 1 253 -17 6 16 0 6 10 18 6 32 55 5 53 21 Uncertainty in time = +/- 7 secs Prediction of 2012 Jul 8.0 Data for the target star ------------------------ * name: TYC 6269-01434-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 18 41.5250 DE: -17 03 33.352 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .035, .029 ) * V mag [mag]: 9.9 * B mag [mag]: 10.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2717) Tellervo approx. diameter [km]: 10 approx. diameter ["]: .017 distance from Earth [AU]: 0.83300 * orbital information: orbit source: Preston date of fit: 2012 Jul 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1226 number of rejected observations: 38 time covered by the observations: 1909 Apr 07 - 2012 Jul 02 1 sigma uncertainty ellipse (major, minor, PA): 0.051, 0.041, 87° remarks: * orbital elements for (2717) Tellervo : Mean anomaly = 331.08438124 deg Arg. of pericenter = 163.32692927 deg Long. of node = 164.95085057 deg Inclination = 3.28142282 deg Eccentricity = 0.21724054 Semimajor axis = 2.21502849 AU Perihelion dist = 1.73383450 AU Mag: H = 12.06, G = 0.15 Epoch of elements : MJD 56121.69200000 TDT (2012 Jul 13.692) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Jul 13 2717 Tellervo 16h 36.2m UT 9.9 18 18 41.525-17 3 33.35TYC 6269-01434-1 10.0 14.2 10 1.9 0.833 -2.123 -6.94 93.6618 -17.058 -67.59 21.69 16.6033 0.02389 -0.10294 -2.88610 -0.65726 0.00141 -0.00046 2000 330.5785152012 712.00000163.326929164.950851 3.2814230.21724054 2.2150285 1.733834512.6 5.00.15 RATE 2.9897520 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.062 0.050 88 3.97 0.049 0 0 0-2 056116.0020120713_1434-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 07, 21:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org