메타데이터
| 항목 |
값 |
| Designation |
118P/Shoemaker-Levy 4 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-11-22T22:36:34.951680Z |
| Orbit solution date (soln_date, UTC) |
2025-08-01T13:53:05Z |
| Obs used |
1771 |
| NEO |
- |
| M1 |
12.400 |
| K1 |
11.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-06-23.0000000 |
| e |
0.45507750 |
| q (au) |
1.831356 |
| a (au) |
3.360765 |
| i (deg) |
10.093960 |
| Ω (om, deg) |
142.114993 |
| ω (w, deg) |
314.438274 |
| M (ma, deg) |
277.143222 |
밝기
산란 + 전체 선형
$$
M_a = (10.603 + 5.506\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.603 |
| n |
5.506 |
| gf |
1.000 |
| gb |
-0.907 |
| k |
1.000 |
| δ90 |
10.000 |
| 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 |
| 2021-05-25 |
2022-11-22 |
+1.8100 |
-0.886 |
| 2022-11-24 |
2024-05-31 |
+0.5960 |
-0.576 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
19:20:04.74 |
-15:49:58.9 |
HIP 94940 |
14.01 |
| 2026-07-29 12:00 |
19:19:45.41 |
-15:51:15.5 |
HIP 94940 |
9.20 |
| 2026-07-30 00:00 |
19:19:26.18 |
-15:52:32.2 |
HIP 94940 |
4.45 |
| 2026-07-30 12:00 |
19:19:07.05 |
-15:53:49.0 |
HIP 94940 |
0.92 |
| 2026-07-31 00:00 |
19:18:48.02 |
-15:55:05.8 |
HIP 94940 |
5.22 |
| 2026-07-31 12:00 |
19:18:29.08 |
-15:56:22.7 |
HIP 94855 |
5.72 |
| 2026-08-01 00:00 |
19:18:10.26 |
-15:57:39.7 |
HIP 94855 |
1.22 |
| 2026-08-01 12:00 |
19:17:51.54 |
-15:58:56.6 |
HIP 94823 |
2.93 |
| 2026-08-02 00:00 |
19:17:32.93 |
-16:00:13.6 |
HIP 94823 |
2.77 |
| 2026-08-02 12:00 |
19:17:14.44 |
-16:01:30.7 |
HIP 94803 |
3.67 |
| 2026-08-03 00:00 |
19:16:56.07 |
-16:02:47.7 |
HIP 94803 |
6.86 |
| 2026-08-03 12:00 |
19:16:37.81 |
-16:04:04.7 |
HIP 94803 |
11.06 |
| 2026-08-04 00:00 |
19:16:19.68 |
-16:05:21.8 |
HIP 94635 |
12.88 |
| 2026-08-04 12:00 |
19:16:01.67 |
-16:06:38.8 |
HIP 94635 |
8.57 |
| 2026-08-05 00:00 |
19:15:43.79 |
-16:07:55.8 |
HIP 94635 |
4.68 |
| 2026-08-05 12:00 |
19:15:26.04 |
-16:09:12.8 |
HIP 94635 |
3.27 |
| 2026-08-06 00:00 |
19:15:08.42 |
-16:10:29.8 |
HIP 94635 |
6.23 |
| 2026-08-06 12:00 |
19:14:50.94 |
-16:11:46.7 |
HIP 94635 |
10.26 |
| 2026-08-07 00:00 |
19:14:33.60 |
-16:13:03.6 |
HIP 94635 |
14.48 |
| 2026-08-07 12:00 |
19:14:16.41 |
-16:14:20.5 |
HIP 94635 |
18.73 |
| 2026-08-08 00:00 |
19:13:59.35 |
-16:15:37.2 |
HIP 94635 |
22.97 |
| 2026-08-08 12:00 |
19:13:42.45 |
-16:16:54.0 |
HIP 94345 |
23.97 |
| 2026-08-09 00:00 |
19:13:25.69 |
-16:18:10.6 |
HIP 94345 |
19.76 |
| 2026-08-09 12:00 |
19:13:09.09 |
-16:19:27.2 |
HIP 94345 |
15.60 |
| 2026-08-10 00:00 |
19:12:52.64 |
-16:20:43.6 |
HIP 94345 |
11.49 |
| 2026-08-10 12:00 |
19:12:36.35 |
-16:22:00.0 |
HIP 94345 |
7.44 |
| 2026-08-11 00:00 |
19:12:20.22 |
-16:23:16.3 |
HIP 94345 |
3.58 |
| 2026-08-11 12:00 |
19:12:04.25 |
-16:24:32.5 |
HIP 94345 |
1.83 |
| 2026-08-12 00:00 |
19:11:48.45 |
-16:25:48.5 |
HIP 94345 |
5.10 |
| 2026-08-12 12:00 |
19:11:32.82 |
-16:27:04.5 |
HIP 94345 |
8.94 |
| 2026-08-13 00:00 |
19:11:17.36 |
-16:28:20.3 |
HIP 94345 |
12.80 |
| 2026-08-13 12:00 |
19:11:02.07 |
-16:29:35.9 |
HIP 94345 |
16.65 |
| 2026-08-14 00:00 |
19:10:46.96 |
-16:30:51.5 |
HIP 94152 |
14.93 |
| 2026-08-14 12:00 |
19:10:32.02 |
-16:32:06.8 |
HIP 94152 |
11.24 |
| 2026-08-15 00:00 |
19:10:17.27 |
-16:33:22.1 |
HIP 94152 |
7.69 |
| 2026-08-15 12:00 |
19:10:02.70 |
-16:34:37.1 |
HIP 94152 |
4.51 |
| 2026-08-16 00:00 |
19:09:48.31 |
-16:35:52.0 |
HIP 94152 |
2.98 |
| 2026-08-16 12:00 |
19:09:34.10 |
-16:37:06.7 |
HIP 94152 |
4.89 |
| 2026-08-17 00:00 |
19:09:20.09 |
-16:38:21.2 |
HIP 94152 |
8.03 |
| 2026-08-17 12:00 |
19:09:06.26 |
-16:39:35.5 |
HIP 94152 |
11.38 |
| 2026-08-18 00:00 |
19:08:52.63 |
-16:40:49.7 |
HIP 94110 |
14.46 |
| 2026-08-18 12:00 |
19:08:39.18 |
-16:42:03.6 |
HIP 94110 |
15.48 |
| 2026-08-19 00:00 |
19:08:25.94 |
-16:43:17.4 |
HIP 94110 |
17.10 |