IOTA/IOTA-ES occultation update for (15147) Siegfried / TYC 6171-00067-1 event on 2024 Jan 22, 22:39 UT Visible from Summary ------- On 2024 Jan 22 UT, the 18.6033419718836 km diameter asteroid (15147) Siegfried will occult a 8.6 mag star in the constellation Libra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 10.56 mag to 19.11 mag (the magnitude of the asteroid) for at most 0.730 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2024 Jan 22, 22:35 - 2024 Jan 22, 22:43 * geocentric midpoint of event [JD]: 2460332.44434258 * magnitude of target star: 8.55 * magnitude drop [mag]: 10.56 * estimated maximum duration [s]: 0.730 * Moon: 92 % sunlit, 142° distance * Sun: 69° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 0.33 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.001", 114°) * approx speed of asteroid's shadow [km/s]: 26.3468 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6171-00067-1 by 15147 Siegfried on 2024 Jan 22 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 50 0 0 28 17 13 22 35 55.4 1 108 -65 28 11 39 28 22 48 28 7 59 28 26 28 .... 51 0 0 27 59 55 22 35 55.5 2 108 -64 27 54 21 28 5 30 27 50 41 28 9 11 -0.09 52 0 0 27 42 19 22 35 55.6 3 109 -63 27 36 44 27 47 54 27 33 3 27 51 35 -0.14 53 0 0 27 24 23 22 35 55.9 4 109 -62 27 18 47 27 29 59 27 15 7 27 33 40 -0.16 54 0 0 27 6 9 22 35 56.1 4 110 -61 27 0 33 27 11 45 26 56 51 27 15 27 -0.17 55 0 0 26 47 36 22 35 56.5 5 110 -61 26 42 0 26 53 13 26 38 18 26 56 55 -0.18 56 0 0 26 28 45 22 35 56.9 6 111 -60 26 23 8 26 34 23 26 19 26 26 38 5 -0.19 57 0 0 26 9 36 22 35 57.4 7 111 -59 26 3 59 26 15 14 26 0 16 26 18 57 -0.19 58 0 0 25 50 9 22 35 58.0 8 112 -58 25 44 31 25 55 48 25 40 49 25 59 31 -0.19 59 0 0 25 30 25 22 35 58.6 9 112 -57 25 24 46 25 36 4 25 21 4 25 39 47 -0.20 60 0 0 25 10 23 22 35 59.3 10 113 -56 25 4 44 25 16 3 25 1 1 25 19 46 -0.20 61 0 0 24 50 4 22 36 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6 27 8 - 6 9 6 -0.23 -149 0 0 - 6 4 41 22 43 44.4 9 255 74 - 6 10 8 - 5 59 15 - 6 13 43 - 5 55 39 -0.23 -148 0 0 - 5 50 54 22 43 45.0 8 255 73 - 5 56 21 - 5 45 26 - 5 59 56 - 5 41 51 -0.23 -147 0 0 - 5 36 44 22 43 45.6 7 255 72 - 5 42 11 - 5 31 16 - 5 45 47 - 5 27 40 -0.23 -146 0 0 - 5 22 11 22 43 46.1 6 255 72 - 5 27 39 - 5 16 43 - 5 31 15 - 5 13 7 -0.23 -145 0 0 - 5 7 17 22 43 46.5 5 255 71 - 5 12 46 - 5 1 49 - 5 16 22 - 4 58 13 -0.23 -144 0 0 - 4 52 2 22 43 46.9 4 255 70 - 4 57 31 - 4 46 33 - 5 1 7 - 4 42 56 -0.23 -143 0 0 - 4 36 25 22 43 47.1 3 255 69 - 4 41 54 - 4 30 55 - 4 45 31 - 4 27 19 -0.23 -142 0 0 - 4 20 27 22 43 47.3 2 255 68 - 4 25 56 - 4 14 57 - 4 29 34 - 4 11 20 -0.23 -141 0 0 - 4 4 8 22 43 47.4 1 255 67 - 4 9 38 - 3 58 37 - 4 13 15 - 3 55 0 -0.25 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 12.0 Data for the target star ------------------------ * name: TYC 6171-00067-1 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 24 05.7547 DE: -15 23 43.835 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 24 05.7549 DE: -15 23 43.836 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 8.6 * B mag [mag]: 9.1 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (15147) Siegfried asteroid class: approx. diameter [km]: 19 approx. diameter ["]: 0.007 distance from Earth [AU]: 3.47910 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#47 date of fit: 2023 Apr 25 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.019", 0.001", 113.85° remarks: * orbital elements for (15147)Siegfried : Mean anomaly = 201.4065923965 deg Arg. of pericenter = 316.9035032634 deg Long. of node = 57.9049232775 deg Inclination = 8.9384075416 deg Eccentricity = 0.0063478367 Semimajor axis = 3.2479537765 AU Perihelion dist = 3.2273362963 AU Mag: H = 12.95, G = 0.15 Epoch of elements : MJD 60331.94434258 TDT (2024 Jan 22.9443) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#472023Apr25,0.73,2024,1,22,22.664222,0.063258,0.211606,14.239523,-4.287102,-0.005441,0.001513,0.000000,0.000000 129.6131,-15.4807,-157.07,-19.62,False TYC 6171-00067-1,15.40159850,-15.3955097,9.14,8.55,8.23,0.2,0,,15.42381997,-15.4807064,10.56,10.43,0,0,0 15147,Siegfried,19.11,19.108,3.4791,0,0,2.491,-10.84,,1.6,0 0,201.2476,2024,1,22,316.9035,57.9049,8.9384,0.00635,3.24795,3.22734,12.95,5.0,0.15 1.329,0.0193,0.0007,114,0.0025,Known errors,1.04,0,-1,-1 20240122_0067-1,60137.03 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 12, 00:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org