IOTA/IOTA-ES occultation update for (7817) Zibiturtle / UCAC4 407-056673 event on 2024 Jun 25, 16:53 UT Visible from Summary ------- On 2024 Jun 25 UT, the 12.0639506901141 km diameter asteroid (7817) Zibiturtle will occult a 9.6 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 8.89 mag to 18.44 mag (the magnitude of the asteroid) for at most 1.870 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 Jun 25, 16:37 - 2024 Jun 25, 17:09 * geocentric midpoint of event [JD]: 2460487.20394600 * magnitude of target star: 9.55 * magnitude drop [mag]: 8.89 * estimated maximum duration [s]: 1.870 * Moon: 83 % sunlit, 118° distance * Sun: 110° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 0.31 * 1 sigma uncertainty interval [seconds]: +/- 3.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.002", 113°) * approx speed of asteroid's shadow [km/s]: 6.6404 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 407-056673 by 7817 Zibiturtle on 2024 Jun 25 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 - 49 0 0 8 11 26 16 38 15.9 1 99 66 8 7 54 8 14 59 8 5 42 8 17 11 .... - 48 0 0 8 1 29 16 38 16.2 2 99 65 7 57 56 8 5 2 7 55 44 8 7 13 0.24 - 47 0 0 7 51 3 16 38 16.8 3 99 64 7 47 30 7 54 36 7 45 17 7 56 48 0.26 - 46 0 0 7 40 9 16 38 17.8 4 99 63 7 36 35 7 43 42 7 34 23 7 45 55 0.27 - 45 0 0 7 28 47 16 38 19.0 5 100 62 7 25 13 7 32 20 7 23 0 7 34 33 0.28 - 44 0 0 7 16 56 16 38 20.6 6 100 61 7 13 22 7 20 30 7 11 9 7 22 43 0.28 - 43 0 0 7 4 37 16 38 22.5 7 100 60 7 1 2 7 8 11 6 58 49 7 10 24 0.28 - 42 0 0 6 51 49 16 38 24.7 8 100 59 6 48 14 6 55 24 6 46 1 6 57 38 0.28 - 41 0 0 6 38 34 16 38 27.2 9 100 58 6 34 58 6 42 9 6 32 45 6 44 22 0.29 - 40 0 0 6 24 49 16 38 30.1 10 100 57 6 21 13 6 28 25 6 19 0 6 30 39 0.29 - 39 0 0 6 10 37 16 38 33.3 11 100 56 6 7 0 6 14 13 6 4 46 6 16 27 0.29 - 38 0 0 5 55 55 16 38 36.8 12 100 55 5 52 19 5 59 32 5 50 4 6 1 46 0.29 - 37 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6 32 -40 59 33 -41 8 42 -40 57 24 0.29 113 0 0 -40 59 24 17 8 41.5 12 269 -71 -41 2 54 -40 55 54 -41 5 4 -40 53 45 0.30 114 0 0 -40 55 23 17 8 44.3 11 268 -70 -40 58 53 -40 51 54 -41 1 3 -40 49 44 0.30 115 0 0 -40 51 1 17 8 46.9 11 267 -70 -40 54 31 -40 47 31 -40 56 41 -40 45 21 0.30 116 0 0 -40 46 17 17 8 49.3 10 267 -70 -40 49 48 -40 42 47 -40 51 58 -40 40 37 0.30 117 0 0 -40 41 12 17 8 51.5 9 266 -69 -40 44 42 -40 37 41 -40 46 53 -40 35 31 0.30 118 0 0 -40 35 45 17 8 53.6 8 265 -69 -40 39 15 -40 32 14 -40 41 26 -40 30 4 0.30 119 0 0 -40 29 56 17 8 55.5 8 265 -68 -40 33 27 -40 26 25 -40 35 37 -40 24 14 0.31 120 0 0 -40 23 45 17 8 57.2 7 264 -68 -40 27 16 -40 20 14 -40 29 27 -40 18 3 0.31 121 0 0 -40 17 13 17 8 58.7 6 263 -67 -40 20 44 -40 13 42 -40 22 55 -40 11 31 0.31 122 0 0 -40 10 19 17 9 0.0 5 263 -67 -40 13 51 -40 6 48 -40 16 2 -40 4 37 0.32 123 0 0 -40 3 4 17 9 1.2 5 262 -66 -40 6 36 -39 59 32 -40 8 47 -39 57 21 0.33 124 0 0 -39 55 27 17 9 2.2 4 262 -66 -39 58 59 -39 51 54 -40 1 10 -39 49 43 0.34 125 0 0 -39 47 28 17 9 3.0 3 261 -65 -39 51 0 -39 43 55 -39 53 12 -39 41 44 0.35 126 0 0 -39 39 8 17 9 3.6 2 260 -65 -39 42 40 -39 35 35 -39 44 52 -39 33 23 0.37 127 0 0 -39 30 26 17 9 4.0 1 260 -64 -39 33 59 -39 26 52 -39 36 11 -39 24 41 0.42 128 0 0 -39 21 22 17 9 4.3 1 259 -64 -39 24 55 -39 17 49 -39 27 8 -39 15 36 0.60 Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 14.4 Data for the target star ------------------------ * name: UCAC4 407-056673 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 13 30 51.7368 DE: -08 47 17.536 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 13 30 51.7368 DE: -08 47 17.535 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.6 * B mag [mag]: 10.5 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (7817) Zibiturtle asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.007 distance from Earth [AU]: 2.22020 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#45 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): 0.016", 0.002", 112.7° remarks: * orbital elements for (7817)Zibiturtle : Mean anomaly = 293.8624379705 deg Arg. of pericenter = 175.3039471166 deg Long. of node = 120.2561885101 deg Inclination = 0.5584039392 deg Eccentricity = 0.0443543986 Semimajor axis = 2.7848263036 AU Perihelion dist = 2.6613070077 AU Mag: H = 13.51, G = 0.15 Epoch of elements : MJD 60486.70394662 TDT (2024 Jun 25.7039) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#452023Apr25,1.87,2024,6,25,16.894704,-0.109588,-0.246282,3.424991,-1.522185,0.004802,-0.001910,0.000000,0.000000 35.2980,-8.9150,-72.71,23.36,False UCAC4 407-056673,13.51437136,-8.7882044,10.47,9.55,9.05,0.2,4,,13.53588342,-8.9150451,8.89,8.94,0,0,0 7817,Zibiturtle,18.44,12.386,2.2202,0,0,0.916,-6.03,,1.0,0 0,293.7131,2024,6,25,175.3039,120.2562,0.5584,0.04435,2.78483,2.66131,13.51,5.0,0.15 1.310,0.0157,0.0024,113,0.0024,Known errors,1.04,0,-1,-1 20240625_056673,60139.40 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 09:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org