IOTA/IOTA-ES occultation update for (3128) Obruchev / TYC 6890-00620-1 event on 2024 Oct 16, 19:38 UT Visible from Summary ------- On 2024 Oct 16 UT, the 21.16 km diameter asteroid (3128) Obruchev will occult a 11.5 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 5.93 mag to 17.42 mag (the magnitude of the asteroid) for at most 1.150 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: 97 * date and approx. time of event: 2024 Oct 16, 19:32 - 2024 Oct 16, 19:43 * geocentric midpoint of event [JD]: 2460600.31808154 * magnitude of target star: 11.49 * magnitude drop [mag]: 5.93 * estimated maximum duration [s]: 1.150 * Moon: 99 % sunlit, 80° distance * Sun: 91° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 25 * 1 sigma uncertainty interval [path widths]: +/- 0.40 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.005", 82°) * approx speed of asteroid's shadow [km/s]: 18.4123 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6890-00620-1 by 3128 Obruchev on 2024 Oct 16 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 -130 0 0 -37 4 55 19 33 3.3 0 119 60 -37 12 34 -36 57 17 -37 18 42 -36 51 11 .... -129 0 0 -37 31 36 19 33 3.4 1 118 60 -37 39 15 -37 23 58 -37 45 22 -37 17 53 0.52 -128 0 0 -37 58 3 19 33 3.6 2 118 60 -38 5 41 -37 50 26 -38 11 48 -37 44 20 0.55 -127 0 0 -38 24 16 19 33 3.8 3 117 60 -38 31 54 -38 16 39 -38 38 1 -38 10 34 0.57 -126 0 0 -38 50 14 19 33 4.2 4 117 59 -38 57 51 -38 42 37 -39 3 58 -38 36 32 0.58 -125 0 0 -39 15 57 19 33 4.7 5 116 59 -39 23 34 -39 8 20 -39 29 39 -39 2 16 0.58 -124 0 0 -39 41 23 19 33 5.2 6 115 59 -39 49 0 -39 33 48 -39 55 5 -39 27 44 0.58 -123 0 0 -40 6 34 19 33 5.9 6 115 59 -40 14 10 -39 58 58 -40 20 15 -39 52 55 0.59 -122 0 0 -40 31 27 19 33 6.6 7 114 58 -40 39 2 -40 23 52 -40 45 7 -40 17 49 0.59 -121 0 0 -40 56 3 19 33 7.4 8 113 58 -41 3 38 -40 48 29 -41 9 42 -40 42 27 0.59 -120 0 0 -41 20 22 19 33 8.3 9 113 58 -41 27 55 -41 12 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Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6890-00620-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 47 58.2137 DE: -22 57 21.702 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 47 58.2132 DE: -22 57 21.704 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.5 * B mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3128) Obruchev asteroid class: approx. diameter [km]: 21 approx. diameter ["]: 0.012 distance from Earth [AU]: 2.44780 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 date of fit: 2023 Apr 24 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): 0.026", 0.005", 82.03° remarks: * orbital elements for (3128)Obruchev : Mean anomaly = 19.1224475602 deg Arg. of pericenter = 188.0462272660 deg Long. of node = 102.3456517182 deg Inclination = 2.9380260582 deg Eccentricity = 0.1577450936 Semimajor axis = 3.1146074221 AU Perihelion dist = 2.6232933826 AU Mag: H = 12.29, G = 0.15 Epoch of elements : MJD 60599.81808120 TDT (2024 Oct 16.8181) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,1.15,2024,10,16,19.633957,0.090909,-0.497242,10.228425,1.838970,0.005611,0.001046,0.000000,0.000000 -22.9579,-22.8957,-118.16,-9.29,False TYC 6890-00620-1,19.79950382,-22.9560284,11.95,11.49,11.24,0.0,0,,19.82412314,-22.8956686,5.94,5.74,0,0,0 3128,Obruchev,17.42,21.160,2.4478,0,0,2.659,6.61,,1.6,0 0,18.9758,2024,10,16,188.0462,102.3457,2.9380,0.15775,3.11461,2.62329,12.29,5.0,0.15 1.400,0.0263,0.0047,82,0.0048,Known errors,1.06,0,-1,-1 20241016_0620-1,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org