IOTA/IOTA-ES occultation update for (29757) 1999 CH8 / HIP 65225 event on 2024 Dec 07, 04:16 UT Visible from Summary ------- On 2024 Dec 07 UT, the 12.0247094967168 km diameter asteroid (29757) 1999 CH8 will occult a 6.3 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 12.37 mag to 18.71 mag (the magnitude of the asteroid) for at most 0.470 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: 70 * date and approx. time of event: 2024 Dec 07, 04:13 - 2024 Dec 07, 04:19 * geocentric midpoint of event [JD]: 2460651.67798562 * magnitude of target star: 6.34 * magnitude drop [mag]: 12.37 * estimated maximum duration [s]: 0.470 * Moon: 34 % sunlit, 128° distance * Sun: 58° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 0.83 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.005", 122°) * approx speed of asteroid's shadow [km/s]: 35.8516 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 65225 by 29757 1999 CH8 on 2024 Dec 7 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 - 29 0 0 12 58 19 4 13 20.2 1 87 -54 12 53 45 13 2 54 12 46 5 13 10 34 12 56 19 13 0 19 .... - 28 0 0 13 0 48 4 13 20.3 2 88 -53 12 56 14 13 5 23 12 48 34 13 13 3 12 58 48 13 2 48 0.02 - 27 0 0 13 3 1 4 13 20.4 2 88 -52 12 58 27 13 7 36 12 50 47 13 15 15 13 1 1 13 5 1 0.03 - 26 0 0 13 4 58 4 13 20.5 3 88 -51 13 0 23 13 9 32 12 52 43 13 17 12 13 2 58 13 6 57 0.03 - 25 0 0 13 6 37 4 13 20.8 4 88 -50 13 2 3 13 11 12 12 54 23 13 18 52 13 4 38 13 8 37 0.04 - 24 0 0 13 8 1 4 13 21.0 5 89 -50 13 3 27 13 12 35 12 55 47 13 20 15 13 6 1 13 10 1 0.04 - 23 0 0 13 9 8 4 13 21.3 6 89 -49 13 4 34 13 13 42 12 56 54 13 21 22 13 7 8 13 11 8 0.04 - 22 0 0 13 9 59 4 13 21.7 7 89 -48 13 5 24 13 14 33 12 57 45 13 22 12 13 7 59 13 11 58 0.04 - 21 0 0 13 10 33 4 13 22.1 8 89 -47 13 5 58 13 15 7 12 58 19 13 22 46 13 8 33 13 12 32 0.04 - 20 0 0 13 10 50 4 13 22.6 9 89 -46 13 6 16 13 15 24 12 58 36 13 23 4 13 8 50 13 12 50 0.04 - 19 0 0 13 10 51 4 13 23.1 10 90 -45 13 6 17 13 15 25 12 58 37 13 23 5 13 8 51 13 12 51 0.04 - 18 0 0 13 10 35 4 13 23.6 11 90 -44 13 6 1 13 15 10 12 58 21 13 22 49 13 8 35 13 12 35 0.04 - 17 0 0 13 10 3 4 13 24.3 12 90 -43 13 5 29 13 14 37 12 57 49 13 22 17 13 8 3 13 12 3 0.04 - 16 0 0 13 9 14 4 13 24.9 13 90 -42 13 4 40 13 13 49 12 57 0 13 21 28 13 7 14 13 11 14 0.04 - 15 0 0 13 8 9 4 13 25.7 14 91 -41 13 3 35 13 12 43 12 55 55 13 20 23 13 6 9 13 10 9 0.04 - 14 0 0 13 6 47 4 13 26.4 15 91 -40 13 2 13 13 11 21 12 54 33 13 19 1 13 4 47 13 8 47 0.04 - 13 0 0 13 5 9 4 13 27.2 16 91 -39 13 0 34 13 9 43 12 52 54 13 17 23 13 3 9 13 7 8 0.04 - 12 0 0 13 3 13 4 13 28.1 17 91 -38 12 58 39 13 7 48 12 50 59 13 15 28 13 1 14 13 5 13 0.04 - 11 0 0 13 1 2 4 13 29.0 18 91 -37 12 56 27 13 5 36 12 48 47 13 13 16 12 59 2 13 3 2 0.04 - 10 0 0 12 58 34 4 13 30.0 19 92 -37 12 53 59 13 3 8 12 46 19 13 10 48 12 56 34 13 0 34 0.04 - 9 0 0 12 55 49 4 13 31.0 20 92 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65 -17 13 53 -17 4 42 -17 21 34 -16 57 1 - 17 11 18 - 17 7 17 0.04 140 0 0 -17 14 30 4 19 13.7 8 275 64 -17 19 5 -17 9 55 -17 26 47 -17 2 14 - 17 16 30 - 17 12 30 0.04 141 0 0 -17 19 27 4 19 14.1 7 275 63 -17 24 2 -17 14 52 -17 31 43 -17 7 11 - 17 21 27 - 17 17 27 0.04 142 0 0 -17 24 8 4 19 14.5 6 275 62 -17 28 43 -17 19 33 -17 36 24 -17 11 52 - 17 26 8 - 17 22 8 0.04 143 0 0 -17 28 33 4 19 14.8 5 274 61 -17 33 8 -17 23 58 -17 40 49 -17 16 18 - 17 30 33 - 17 26 33 0.04 144 0 0 -17 32 43 4 19 15.1 5 274 61 -17 37 17 -17 28 8 -17 44 58 -17 20 27 - 17 34 43 - 17 30 43 0.04 145 0 0 -17 36 36 4 19 15.3 4 274 60 -17 41 11 -17 32 2 -17 48 51 -17 24 21 - 17 38 36 - 17 34 36 0.04 146 0 0 -17 40 14 4 19 15.4 3 274 59 -17 44 49 -17 35 39 -17 52 29 -17 27 59 - 17 42 14 - 17 38 14 0.04 147 0 0 -17 43 36 4 19 15.6 2 273 58 -17 48 10 -17 39 1 -17 55 50 -17 31 21 - 17 45 36 - 17 41 36 0.04 148 0 0 -17 46 41 4 19 15.6 1 273 57 -17 51 16 -17 42 7 -17 58 56 -17 34 27 - 17 48 41 - 17 44 41 0.04 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: HIP 65225 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 13 22 01.7553 DE: +02 45 25.778 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 13 22 01.7554 DE: +02 45 25.777 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 6.3 * B mag [mag]: 7.9 * Diameter [mas]: 2.40 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (29757) 1999 CH8 asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.006 distance from Earth [AU]: 2.76580 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 date of fit: 2023 Apr 27 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): 0.017", 0.005", 122.395° remarks: * orbital elements for (29757)1999 CH8 : Mean anomaly = 316.8036615193 deg Arg. of pericenter = 132.1816609247 deg Long. of node = 100.6616763725 deg Inclination = 12.5688523332 deg Eccentricity = 0.1373448483 Semimajor axis = 2.6294237502 AU Perihelion dist = 2.2682859441 AU Mag: H = 13.59, G = 0.15 Epoch of elements : MJD 60651.17798579 TDT (2024 Dec 07.1780) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr27,0.47,2024,12,7,4.271655,-0.011005,-0.040786,19.518545,-5.339256,-0.004309,0.002375,-0.000001,0.000000 60.3127,2.6269,113.81,-22.66,False HIP 65225,13.36715421,2.7571609,7.92,6.34,5.49,2.4,4,,13.38806893,2.6269135,12.37,12.77,0,0,0 29757,1999 CH8,18.71,16.839,2.7658,0,0,4.142,-16.98,,1.4,0 0,316.7625,2024,12,7,132.1817,100.6617,12.5689,0.13734,2.62942,2.26829,13.59,5.0,0.15 1.838,0.0173,0.0050,122,0.0070,Known errors,1.20,0,-1,-1 20241207__65225,60140.73 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org