C/1996 B2 (Hyakutake)
메타데이터
| 항목 | 값 |
|---|---|
| Designation | C/1996 B2 (Hyakutake) |
| Type | C |
| Perihelion (tp_cal, UTC) | 1996-05-01T09:27:34.128000Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:29:47Z |
| Obs used | 977 |
| NEO | - |
| M1 | 7.400 |
| K1 | 10.750 |
| PC | 0.030 |
Osculating 궤도요소
| 항목 | 값 |
|---|---|
| Epoch (epoch_cal, TDB) | 1996-03-15.0000000 |
| e | 0.99989165 |
| q (au) | 0.230224 |
| a (au) | 2124.755444 |
| i (deg) | 124.922049 |
| Ω (om, deg) | 188.045132 |
| ω (w, deg) | 130.175121 |
| M (ma, deg) | 359.999523 |
밝기
산란 + 전체 선형
$$ M_a = (5.511 + 2.906\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
모델 상수
| 항목 | 값 |
|---|---|
| H0 | 5.511 |
| n | 2.906 |
| gf | 0.800 |
| gb | -0.500 |
| k | 0.874 |
| δ90 | 1.000 |
| 파라미터 | 기호 | 범위 | 설명 |
|---|---|---|---|
| 태양·지구거리 1 AU에서의 절대등급 | H0 | -5 to 20 | 혜성의 고유 밝기 |
| 광도 기울기 파라미터 | n | 2 to 6 | 태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 | gf |
0.8 to 1 | 전방 산란의 강도 |
| 후방 산란 비대칭 계수 | gb |
-1 to -0.5 | 후방 산란의 강도 |
| 분할 계수 | k | 0.8 to 1 | 전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 | δ90 | 1 to 10 | 코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) | 끝 (UTC) | a | b |
|---|---|---|---|
| 1996-01-01 | 1996-02-19 | +29.8235 | -6.481 |
| 1996-02-19 | 1996-03-29 | +2.2342 | -0.120 |
| 1996-03-29 | 1996-05-01 | -0.2001 | +0.012 |
| 1996-05-01 | 1996-05-17 | +4.8585 | +1.527 |
| 1996-05-17 | 1996-06-11 | -2.2356 | -0.537 |
| 1996-06-11 | 1996-07-06 | +3.6146 | -0.826 |
| 1996-07-06 | 1996-08-01 | +3.0246 | -0.925 |
| 1996-08-01 | 1996-10-24 | +15.0784 | -4.852 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 13:42:02.75 | -57:38:09.0 | HIP 66793 | 12.48 |
| 2026-09-20 12:00 | 13:42:05.99 | -57:38:03.9 | HIP 66960 | 12.27 |
| 2026-09-21 00:00 | 13:42:09.25 | -57:37:59.0 | HIP 66960 | 11.93 |
| 2026-09-21 12:00 | 13:42:12.53 | -57:37:54.3 | HIP 66975 | 11.49 |
| 2026-09-22 00:00 | 13:42:15.82 | -57:37:49.9 | HIP 66975 | 11.05 |
| 2026-09-22 12:00 | 13:42:19.12 | -57:37:45.6 | HIP 66975 | 10.60 |
| 2026-09-23 00:00 | 13:42:22.44 | -57:37:41.5 | HIP 66975 | 10.15 |
| 2026-09-23 12:00 | 13:42:25.77 | -57:37:37.6 | HIP 66975 | 9.70 |
| 2026-09-24 00:00 | 13:42:29.12 | -57:37:33.9 | HIP 66975 | 9.25 |
| 2026-09-24 12:00 | 13:42:32.48 | -57:37:30.5 | HIP 66975 | 8.80 |
| 2026-09-25 00:00 | 13:42:35.85 | -57:37:27.2 | HIP 66975 | 8.35 |
| 2026-09-25 12:00 | 13:42:39.23 | -57:37:24.2 | HIP 66975 | 7.90 |
| 2026-09-26 00:00 | 13:42:42.63 | -57:37:21.3 | HIP 66975 | 7.45 |
| 2026-09-26 12:00 | 13:42:46.04 | -57:37:18.7 | HIP 66975 | 7.00 |
| 2026-09-27 00:00 | 13:42:49.47 | -57:37:16.2 | HIP 66975 | 6.54 |
| 2026-09-27 12:00 | 13:42:52.90 | -57:37:14.0 | HIP 66975 | 6.09 |
| 2026-09-28 00:00 | 13:42:56.35 | -57:37:12.0 | HIP 66975 | 5.64 |
| 2026-09-28 12:00 | 13:42:59.81 | -57:37:10.1 | HIP 66975 | 5.20 |
| 2026-09-29 00:00 | 13:43:03.28 | -57:37:08.5 | HIP 66975 | 4.75 |
| 2026-09-29 12:00 | 13:43:06.76 | -57:37:07.1 | HIP 66975 | 4.31 |
| 2026-09-30 00:00 | 13:43:10.26 | -57:37:05.9 | HIP 66975 | 3.88 |
| 2026-09-30 12:00 | 13:43:13.76 | -57:37:04.9 | HIP 66975 | 3.46 |
| 2026-10-01 00:00 | 13:43:17.27 | -57:37:04.1 | HIP 66975 | 3.05 |
| 2026-10-01 12:00 | 13:43:20.80 | -57:37:03.6 | HIP 66975 | 2.66 |
| 2026-10-02 00:00 | 13:43:24.34 | -57:37:03.2 | HIP 66975 | 2.30 |
| 2026-10-02 12:00 | 13:43:27.88 | -57:37:03.0 | HIP 66975 | 2.00 |
| 2026-10-03 00:00 | 13:43:31.44 | -57:37:03.0 | HIP 66975 | 1.78 |
| 2026-10-03 12:00 | 13:43:35.00 | -57:37:03.3 | HIP 66975 | 1.67 |
| 2026-10-04 00:00 | 13:43:38.58 | -57:37:03.7 | HIP 66975 | 1.69 |
| 2026-10-04 12:00 | 13:43:42.16 | -57:37:04.4 | HIP 66975 | 1.85 |
| 2026-10-05 00:00 | 13:43:45.76 | -57:37:05.3 | HIP 66975 | 2.11 |
| 2026-10-05 12:00 | 13:43:49.36 | -57:37:06.3 | HIP 66975 | 2.45 |
| 2026-10-06 00:00 | 13:43:52.97 | -57:37:07.6 | HIP 66975 | 2.83 |
| 2026-10-06 12:00 | 13:43:56.59 | -57:37:09.1 | HIP 66975 | 3.24 |
| 2026-10-07 00:00 | 13:44:00.21 | -57:37:10.8 | HIP 66975 | 3.67 |
| 2026-10-07 12:00 | 13:44:03.85 | -57:37:12.7 | HIP 66975 | 4.11 |
| 2026-10-08 00:00 | 13:44:07.49 | -57:37:14.8 | HIP 66975 | 4.57 |
| 2026-10-08 12:00 | 13:44:11.14 | -57:37:17.1 | HIP 66975 | 5.04 |
| 2026-10-09 00:00 | 13:44:14.79 | -57:37:19.7 | HIP 66975 | 5.51 |
| 2026-10-09 12:00 | 13:44:18.46 | -57:37:22.4 | HIP 66975 | 5.98 |
| 2026-10-10 00:00 | 13:44:22.12 | -57:37:25.3 | HIP 66975 | 6.46 |
| 2026-10-10 12:00 | 13:44:25.80 | -57:37:28.5 | HIP 66975 | 6.95 |
| 2026-10-11 00:00 | 13:44:29.48 | -57:37:31.8 | HIP 66975 | 7.44 |