IOTA/IOTA-ES occultation update for (1145) Robelmonte / TYC 6819-02404-1 event on 2024 Oct 02, 16:30 UT Visible from Summary ------- On 2024 Oct 02 UT, the 24.429 km diameter asteroid (1145) Robelmonte will occult a 11.9 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.14 mag to 16.02 mag (the magnitude of the asteroid) for at most 0.790 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 02, 16:26 - 2024 Oct 02, 16:33 * geocentric midpoint of event [JD]: 2460586.18762088 * magnitude of target star: 11.90 * magnitude drop [mag]: 4.14 * estimated maximum duration [s]: 0.790 * Moon: 0 % sunlit, 71° distance * Sun: 69° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 25 * 1 sigma uncertainty interval [path widths]: +/- 0.17 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.002", 95°) * approx speed of asteroid's shadow [km/s]: 30.9687 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6819-02404-1 by 1145 Robelmonte on 2024 Oct 2 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 - 96 0 0 -10 43 51 16 26 48.9 1 118 63 -10 51 35 -10 36 8 -10 54 17 -10 33 26 .... - 95 0 0 -11 16 18 16 26 49.0 2 118 64 -11 24 2 -11 8 35 -11 26 44 -11 5 53 0.24 - 94 0 0 -11 48 45 16 26 49.1 3 118 64 -11 56 29 -11 41 2 -11 59 11 -11 38 20 0.23 - 93 0 0 -12 21 11 16 26 49.4 4 118 65 -12 28 55 -12 13 27 -12 31 37 -12 10 46 0.23 - 92 0 0 -12 53 35 16 26 49.7 5 118 66 -13 1 19 -12 45 51 -13 4 1 -12 43 9 0.22 - 91 0 0 -13 25 56 16 26 50.2 6 117 67 -13 33 40 -13 18 12 -13 36 22 -13 15 30 0.22 - 90 0 0 -13 58 13 16 26 50.7 7 117 67 -14 5 57 -13 50 29 -14 8 39 -13 47 47 0.22 - 89 0 0 -14 30 25 16 26 51.2 9 117 68 -14 38 9 -14 22 42 -14 40 51 -14 20 0 0.22 - 88 0 0 -15 2 32 16 26 51.9 10 117 69 -15 10 16 -14 54 48 -15 12 58 -14 52 6 0.22 - 87 0 0 -15 34 32 16 26 52.6 11 116 69 -15 42 15 -15 26 48 -15 44 57 -15 24 6 0.22 - 86 0 0 -16 6 24 16 26 53.4 12 116 70 -16 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243 -60 -14 37 1 -14 21 33 -14 39 43 -14 18 51 0.25 86 0 0 -13 57 4 16 33 30.4 7 243 -61 -14 4 48 -13 49 20 -14 7 30 -13 46 38 0.25 87 0 0 -13 24 47 16 33 30.9 6 243 -62 -13 32 31 -13 17 3 -13 35 13 -13 14 21 0.26 88 0 0 -12 52 26 16 33 31.3 5 242 -63 -13 0 10 -12 44 42 -13 2 52 -12 42 0 0.27 89 0 0 -12 20 2 16 33 31.6 4 242 -64 -12 27 46 -12 12 18 -12 30 28 -12 9 36 0.28 90 0 0 -11 47 36 16 33 31.9 3 242 -66 -11 55 20 -11 39 52 -11 58 2 -11 37 10 0.31 91 0 0 -11 15 9 16 33 32.1 2 242 -67 -11 22 52 -11 7 25 -11 25 34 -11 4 44 0.36 92 0 0 -10 42 42 16 33 32.2 1 242 -68 -10 50 25 -10 34 58 -10 53 7 -10 32 17 0.57 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6819-02404-1 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 08 12.9860 DE: -28 05 19.984 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 08 12.9860 DE: -28 05 19.984 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1145) Robelmonte asteroid class: approx. diameter [km]: 24 approx. diameter ["]: 0.015 distance from Earth [AU]: 2.31140 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#59 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): 0.017", 0.002", 94.826° remarks: * orbital elements for (1145)Robelmonte : Mean anomaly = 23.7771017058 deg Arg. of pericenter = 267.1623082926 deg Long. of node = 346.7766904097 deg Inclination = 6.2079267777 deg Eccentricity = 0.1196215244 Semimajor axis = 2.4236191145 AU Perihelion dist = 2.1337021015 AU Mag: H = 11.35, G = 0.15 Epoch of elements : MJD 60585.68762067 TDT (2024 Oct 02.6876) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#592023Apr24,0.79,2024,10,2,16.502901,-0.000357,-0.202087,17.479592,0.004434,0.005053,-0.000618,-0.000001,0.000000 -1.9868,-28.1222,-70.26,-3.95,False TYC 6819-02404-1,17.13694061,-28.0888845,12.07,11.90,11.81,0.0,0,,17.16263245,-28.1221538,4.14,3.79,0,0,0 1145,Robelmonte,16.02,24.429,2.3114,0,0,5.027,0.02,,1.4,0 0,23.5975,2024,10,2,267.1623,346.7767,6.2079,0.11962,2.42362,2.13370,11.35,5.0,0.15 1.174,0.0167,0.0021,95,0.0025,Known errors,0.92,0,-1,-1 20241002_2404-1,60140.60 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org