IOTA/IOTA-ES occultation update for (1712) Angola / UCAC4-450-043465 event on 2023 Dec 01, 07:35 UT Visible from W USA Summary ------- On 2023 Dec 01 UT, the 67 km diameter asteroid (1712) Angola will occult a 12.3 mag star in the constellation Hydra for observers along a path across W USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.65 mag to 15.95 mag (the magnitude of the asteroid) for at most 6.500 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: 2023 Dec 01, 07:26 - 2023 Dec 01, 07:38 * geocentric midpoint of event [JD]: 2460279.81427688 * magnitude of target star: 12.34 * magnitude drop [mag]: 3.65 * estimated maximum duration [s]: 6.500 * Moon: 85 % sunlit, 27° distance * Sun: 121° distance * rough path description: W USA The occultation path -------------------- * approximate projected width [km]: 130 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 0.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.001", 110°) * approx speed of asteroid's shadow [km/s]: 10.3098 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-450-043465 by 1712 Angola on 2023 Dec 1 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 ' " Longitude Longitude Longitude Longitude .. .. .. 55 0 0 .. .. .... .. .. .. ... .. .. -146 8 52 ... .. .. -141 51 18 .... -140 56 22 54 0 0 7 27 21.4 4 96 -52 ... .. .. -137 16 32 ... .. .. -135 50 38 .... -135 37 7 53 0 0 7 27 28.3 7 100 -55 -138 31 10 -133 16 23 -140 22 56 -132 13 22 1.32 -132 13 56 52 0 0 7 27 35.5 10 103 -57 -134 20 32 -130 22 1 -135 32 3 -129 29 52 1.51 -129 39 3 51 0 0 7 27 42.8 11 104 -59 -131 23 36 -128 3 15 -132 20 23 -127 17 46 1.57 -127 33 11 50 0 0 7 27 50.2 13 106 -60 -129 4 20 -126 8 3 -129 52 55 -125 27 10 1.61 -125 47 29 49 0 0 7 27 57.9 14 107 -61 -127 9 24 -124 30 2 -127 52 34 -123 52 34 1.63 -124 16 55 48 0 0 7 28 5.6 16 108 -63 -125 32 1 -123 5 21 -126 11 17 -122 30 33 1.65 -122 58 21 47 0 0 7 28 13.6 17 109 -64 -124 8 8 -121 51 26 -124 44 25 -121 18 46 1.66 -121 49 35 46 0 0 7 28 21.6 18 110 -65 -122 55 5 -120 46 29 -123 29 2 -120 15 36 1.67 -120 49 4 45 0 0 7 28 29.9 19 110 -66 -121 51 3 -119 49 9 -122 23 4 -119 19 45 1.67 -119 55 38 44 0 0 7 28 38.2 20 110 -67 -120 54 39 -118 58 25 -121 25 4 -118 30 17 1.68 -119 8 22 43 0 0 7 28 46.8 21 111 -68 -120 4 52 -118 13 28 -120 33 55 -117 46 26 1.68 -118 26 33 42 0 0 7 28 55.4 22 111 -70 -119 20 52 -117 33 40 -119 48 45 -117 7 35 1.68 -117 49 36 41 0 0 7 29 4.2 23 111 -71 -118 42 1 -116 58 29 -119 8 54 -116 33 15 1.69 -117 17 2 40 0 0 7 29 13.1 23 111 -72 -118 7 47 -116 27 29 -118 33 47 -116 2 59 1.69 -116 48 28 39 0 0 7 29 22.2 24 111 -73 -117 37 44 -116 0 17 -118 2 58 -115 36 28 1.69 -116 23 33 38 0 0 7 29 31.4 25 111 -74 -117 11 31 -115 36 36 -117 36 3 -115 13 22 1.69 -116 2 0 37 0 0 7 29 40.7 25 111 -75 -116 48 48 -115 16 10 -117 12 43 -114 53 28 1.69 -115 43 35 36 0 0 7 29 50.1 26 111 -76 -116 29 21 -114 58 44 -116 52 43 -114 36 31 1.69 -115 28 6 35 0 0 7 29 59.7 27 110 -77 -116 12 55 -114 44 8 -116 35 48 -114 22 20 1.69 -115 15 21 34 0 0 7 30 9.3 27 110 -78 -115 59 20 -114 32 10 -116 21 47 -114 10 46 1.69 -115 5 11 33 0 0 7 30 19.1 28 110 -79 -115 48 26 -114 22 43 -116 10 29 -114 1 40 1.69 -114 57 28 32 0 0 7 30 29.0 28 109 -80 -115 40 3 -114 15 39 -116 1 45 -113 54 54 1.69 -114 52 5 31 0 0 7 30 39.0 29 109 -81 -115 34 4 -114 10 51 -115 55 28 -113 50 23 1.69 -114 48 57 30 0 0 7 30 49.1 29 109 -82 -115 30 24 -114 8 13 -115 51 31 -113 48 0 1.69 -114 47 57 29 0 0 7 30 59.3 29 108 -83 -115 28 56 -114 7 40 -115 49 49 -113 47 40 1.69 -114 49 2 28 0 0 7 31 9.6 30 108 -84 -115 29 37 -114 9 9 -115 50 17 -113 49 21 -1.69 -114 52 8 27 0 0 7 31 20.0 30 107 -84 -115 32 21 -114 12 35 -115 52 50 -113 52 57 -1.68 -114 57 11 26 0 0 7 31 30.5 30 106 -85 -115 37 5 -114 17 56 -115 57 25 -113 58 26 -1.68 -115 4 8 25 0 0 7 31 41.1 30 106 -86 -115 43 48 -114 25 8 -116 4 0 -114 5 46 -1.68 -115 12 59 24 0 0 7 31 51.7 31 105 -87 -115 52 26 -114 34 11 -116 12 31 -114 14 55 -1.68 -115 23 40 23 0 0 7 32 2.5 31 105 -88 -116 2 58 -114 45 2 -116 22 59 -114 25 50 -1.68 -115 36 12 22 0 0 7 32 13.3 31 104 -88 -116 15 23 -114 57 40 -116 35 21 -114 38 32 -1.68 -115 50 34 21 0 0 7 32 24.2 31 103 -88 -116 29 41 -115 12 6 -116 49 36 -114 53 0 -1.67 -116 6 44 20 0 0 7 32 35.2 31 103 -88 -116 45 50 -115 28 18 -117 5 45 -115 9 12 -1.67 -116 24 45 19 0 0 7 32 46.2 31 102 -87 -117 3 52 -115 46 17 -117 23 49 -115 27 11 -1.67 -116 44 36 18 0 0 7 32 57.3 31 101 -86 -117 23 48 -116 6 3 -117 43 47 -115 46 56 -1.67 -117 6 18 17 0 0 7 33 8.5 31 100 -85 -117 45 39 -116 27 39 -118 5 42 -116 8 28 -1.67 -117 29 55 16 0 0 7 33 19.7 31 100 -84 -118 9 27 -116 51 6 -118 29 36 -116 31 50 -1.67 -117 55 28 15 0 0 7 33 31.0 30 99 -83 -118 35 14 -117 16 26 -118 55 31 -116 57 4 -1.66 -118 23 1 14 0 0 7 33 42.3 30 98 -82 -119 3 5 -117 43 42 -119 23 31 -117 24 12 -1.66 -118 52 37 13 0 0 7 33 53.7 30 98 -81 -119 33 2 -118 12 57 -119 53 40 -117 53 18 -1.66 -119 24 20 12 0 0 7 34 5.2 29 97 -80 -120 5 12 -118 44 17 -120 26 4 -118 24 26 -1.66 -119 58 17 11 0 0 7 34 16.6 29 96 -79 -120 39 39 -119 17 45 -121 0 48 -118 57 41 -1.66 -120 34 34 10 0 0 7 34 28.1 29 96 -77 -121 16 32 -119 53 29 -121 37 59 -119 33 9 -1.66 -121 13 18 9 0 0 7 34 39.7 28 95 -76 -121 55 58 -120 31 35 -122 17 47 -120 10 56 -1.66 -121 54 39 8 0 0 7 34 51.3 28 94 -75 -122 38 7 -121 12 11 -123 0 22 -120 51 11 -1.66 -122 38 47 7 0 0 7 35 2.9 27 94 -74 -123 23 11 -121 55 28 -123 45 57 -121 34 4 -1.66 -123 25 57 6 0 0 7 35 14.5 26 93 -73 -124 11 25 -122 41 38 -124 34 45 -122 19 45 -1.66 -124 16 22 5 0 0 7 35 26.2 26 92 -72 -125 3 6 -123 30 54 -125 27 7 -123 8 29 -1.66 -125 10 23 4 0 0 7 35 37.9 25 92 -70 -125 58 36 -124 23 35 -126 23 24 -124 0 32 -1.66 -126 8 23 3 0 0 7 35 49.6 24 91 -69 -126 58 20 -125 20 1 -127 24 5 -124 56 14 -1.67 -127 10 52 2 0 0 7 36 1.3 23 91 -68 -128 2 52 -126 20 38 -128 29 46 -125 55 59 -1.67 -128 18 26 1 0 0 7 36 13.0 22 90 -66 -129 12 57 -127 25 58 -129 41 13 -127 0 18 -1.67 -129 31 55 0 0 0 7 36 24.7 21 90 -65 -130 29 31 -128 36 46 -130 59 30 -128 9 51 -1.68 .. .. .. - 8 0 0 .. .. .... .. .. .. ... .. .. ... .. .. ... .. .. -146 20 6 .... Latitude Latitude Latitude Latitude -131 0 0 - 1 5 21 7 36 37.5 19 90 -63 - 0 22 23 - 1 47 16 - 0 0 22 - 2 7 58 .... -132 0 0 - 1 46 5 7 36 45.4 18 89 -62 - 1 4 6 - 2 27 6 - 0 42 36 - 2 47 23 -1.68 -133 0 0 - 2 23 59 7 36 52.8 17 89 -61 - 1 42 51 - 3 4 11 - 1 21 49 - 3 24 5 -1.68 -134 0 0 - 2 59 10 7 36 59.7 16 89 -60 - 2 18 49 - 3 38 39 - 1 58 10 - 3 58 12 -1.69 -135 0 0 - 3 31 47 7 37 6.0 15 89 -59 - 2 52 7 - 4 10 37 - 2 31 50 - 4 29 51 -1.69 -136 0 0 - 4 1 56 7 37 11.9 14 89 -58 - 3 22 53 - 4 40 12 - 3 2 56 - 4 59 9 -1.70 -137 0 0 - 4 29 43 7 37 17.3 13 89 -57 - 3 51 13 - 5 7 28 - 3 31 34 - 5 26 10 -1.70 -138 0 0 - 4 55 14 7 37 22.3 12 89 -56 - 4 17 13 - 5 32 31 - 3 57 49 - 5 51 0 -1.71 -139 0 0 - 5 18 33 7 37 26.9 11 89 -56 - 4 40 58 - 5 55 25 - 4 21 48 - 6 13 42 -1.72 -140 0 0 - 5 39 44 7 37 31.0 10 89 -55 - 5 2 32 - 6 16 14 - 4 43 34 - 6 34 21 -1.73 -141 0 0 - 5 58 50 7 37 34.7 9 89 -54 - 5 21 59 - 6 35 1 - 5 3 11 - 6 52 59 -1.74 -142 0 0 - 6 15 55 7 37 38.0 8 89 -53 - 5 39 21 - 6 51 49 - 5 20 42 - 7 9 39 -1.75 -143 0 0 - 6 31 0 7 37 41.0 7 89 -52 - 5 54 42 - 7 6 41 - 5 36 11 - 7 24 23 -1.77 -144 0 0 - 6 44 9 7 37 43.5 6 89 -51 - 6 8 3 - 7 19 37 - 5 49 39 - 7 37 14 -1.79 -145 0 0 - 6 55 22 7 37 45.7 5 89 -50 - 6 19 26 - 7 30 41 - 6 1 8 - 7 48 13 -1.81 -146 0 0 - 7 4 42 7 37 47.6 4 90 -50 - 6 28 54 - 7 39 53 - 6 10 40 - 7 57 21 -1.85 -147 0 0 - 7 12 9 7 37 49.0 4 90 -49 - 6 36 27 - 7 47 14 - 6 18 16 - 8 4 40 -1.90 -148 0 0 - 7 17 44 7 37 50.1 3 90 -48 - 6 42 6 - 7 52 46 - 6 23 57 - 8 10 9 -2.00 -149 0 0 - 7 21 28 7 37 50.8 2 90 -47 - 6 45 51 - 7 56 28 - 6 27 43 - 8 13 51 -2.21 -150 0 0 - 7 23 20 7 37 51.2 1 90 -47 - 6 47 43 - 7 58 21 - 6 29 34 - 8 15 44 -3.20 Uncertainty in time = +/- 2 secs Prediction of 2023 Oct 15.9 Data for the target star ------------------------ * name: UCAC4-450-043465 * constellation : Hydra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 08 14 06.1716 DE: -00 00 13.878 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 08 14 06.1717 DE: -00 00 13.879 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1712) Angola asteroid class: approx. diameter [km]: 67 approx. diameter ["]: 0.032 distance from Earth [AU]: 2.90730 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#69 date of fit: 2023 Oct 09 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): 0.008", 0.001", 110.153° remarks: * orbital elements for (1712)Angola : Mean anomaly = 230.2494623280 deg Arg. of pericenter = 17.5358065027 deg Long. of node = 237.4546342030 deg Inclination = 19.3968072748 deg Eccentricity = 0.1549350068 Semimajor axis = 3.1615979464 AU Perihelion dist = 2.6717557471 AU Mag: H = 10.11, G = 0.15 Epoch of elements : MJD 60279.31659722 TDT (2023 Dec 01.3166) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#692023Oct09,6.50,2023,12,1,7.542645,-0.786385,0.342962,-2.326207,-5.333939,-0.004700,0.002238,0.000001,0.000000 -59.2115,-0.0746,64.08,-21.77,False UCAC4-450-043465,8.23504766,-0.0038549,0.00,12.34,0.00,0.0,0,,8.25557712,-0.0745954,3.65,0.00,0,0,0 1712,Angola,15.95,67.000,2.9073,0,0,-0.469,-16.14,,3.4,0 0,230.1940,2023,12,1,17.5358,237.4546,19.3968,0.15494,3.16160,2.67176,10.11,5.0,0.15 1.251,0.0080,0.0007,110,0.0080,Known errors,-1.00,0,-1,-1 20231201_043465,60232.88 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Oct 15, 21:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org