IOTA/IOTA-ES occultation update for (4245) Nairc / TYC 6845-00940-1 event on 2024 Oct 21, 16:32 UT Visible from Summary ------- On 2024 Oct 21 UT, the 10.3225992501257 km diameter asteroid (4245) Nairc will occult a 10.1 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 9.01 mag to 19.06 mag (the magnitude of the asteroid) for at most 0.330 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 Oct 21, 16:29 - 2024 Oct 21, 16:36 * geocentric midpoint of event [JD]: 2460605.18947216 * magnitude of target star: 10.05 * magnitude drop [mag]: 9.01 * estimated maximum duration [s]: 0.330 * Moon: 77 % sunlit, 176° distance * Sun: 60° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.001", 91°) * approx speed of asteroid's shadow [km/s]: 31.9640 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6845-00940-1 by 4245 Nairc on 2024 Oct 21 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 -101 0 0 - 4 39 28 16 29 31.5 0 115 60 - 4 42 37 - 4 36 18 - 4 43 34 - 4 35 21 .... -100 0 0 - 5 7 40 16 29 31.5 1 115 61 - 5 10 50 - 5 4 30 - 5 11 47 - 5 3 33 0.17 - 99 0 0 - 5 35 51 16 29 31.6 2 115 62 - 5 39 0 - 5 32 41 - 5 39 57 - 5 31 44 0.12 - 98 0 0 - 6 3 59 16 29 31.8 3 115 63 - 6 7 9 - 6 0 50 - 6 8 6 - 5 59 53 0.11 - 97 0 0 - 6 32 5 16 29 32.1 5 115 64 - 6 35 14 - 6 28 55 - 6 36 11 - 6 27 58 0.10 - 96 0 0 - 7 0 7 16 29 32.4 6 115 65 - 7 3 16 - 6 56 57 - 7 4 13 - 6 56 0 0.10 - 95 0 0 - 7 28 4 16 29 32.8 7 114 66 - 7 31 13 - 7 24 54 - 7 32 10 - 7 23 57 0.09 - 94 0 0 - 7 55 56 16 29 33.3 8 114 67 - 7 59 5 - 7 52 46 - 8 0 2 - 7 51 49 0.09 - 93 0 0 - 8 23 42 16 29 33.9 9 114 68 - 8 26 51 - 8 20 32 - 8 27 48 - 8 19 35 0.09 - 92 0 0 - 8 51 21 16 29 34.5 10 114 69 - 8 54 30 - 8 48 12 - 8 55 27 - 8 47 15 0.09 - 91 0 0 - 9 18 53 16 29 35.2 11 114 70 - 9 22 2 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- 3 8 30 - 3 2 11 - 3 9 27 - 3 1 14 0.33 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6845-00940-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 54 39.1168 DE: -25 01 09.370 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 54 39.1168 DE: -25 01 09.370 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 10.1 * B mag [mag]: 10.5 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4245) Nairc asteroid class: approx. diameter [km]: 10 approx. diameter ["]: 0.005 distance from Earth [AU]: 2.66660 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#43 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): 0.010", 0.001", 90.915° remarks: * orbital elements for (4245)Nairc : Mean anomaly = 284.5919351129 deg Arg. of pericenter = 26.1799894597 deg Long. of node = 359.0043715727 deg Inclination = 1.9425490096 deg Eccentricity = 0.1679700791 Semimajor axis = 2.3751198347 AU Perihelion dist = 1.9761707683 AU Mag: H = 14.03, G = 0.15 Epoch of elements : MJD 60604.68947200 TDT (2024 Oct 21.6895) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#432023Apr24,0.33,2024,10,21,16.547332,0.000679,-0.070605,18.038567,0.317941,0.004877,-0.000112,-0.000001,0.000000 -9.7806,-25.0247,-72.08,-11.04,False TYC 6845-00940-1,17.91086584,-25.0192695,10.46,10.05,9.83,0.1,0,,17.93607867,-25.0247120,9.01,8.78,0,0,0 4245,Nairc,19.06,10.516,2.6666,0,0,4.378,1.05,,0.8,0 0,284.4063,2024,10,21,26.1800,359.0044,1.9425,0.16797,2.37512,1.97617,14.03,5.0,0.15 1.150,0.0097,0.0007,91,0.0008,Known errors,1.43,0,-1,-1 20241021_0940-1,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org