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) |
| 2026-06-01 00:00 |
19:53:54.94 |
-14:07:51.8 |
HIP 98014 |
26.95 |
| 2026-06-01 12:00 |
19:53:45.27 |
-14:08:06.1 |
HIP 98014 |
28.67 |
| 2026-06-02 00:00 |
19:53:35.40 |
-14:08:21.3 |
HIP 97849 |
28.70 |
| 2026-06-02 12:00 |
19:53:25.32 |
-14:08:37.3 |
HIP 97849 |
27.94 |
| 2026-06-03 00:00 |
19:53:15.04 |
-14:08:54.0 |
HIP 97849 |
27.36 |
| 2026-06-03 12:00 |
19:53:04.55 |
-14:09:11.6 |
HIP 97849 |
27.00 |
| 2026-06-04 00:00 |
19:52:53.86 |
-14:09:30.0 |
HIP 97849 |
26.86 |
| 2026-06-04 12:00 |
19:52:42.97 |
-14:09:49.1 |
HIP 97849 |
26.97 |
| 2026-06-05 00:00 |
19:52:31.88 |
-14:10:09.1 |
HIP 97849 |
27.34 |
| 2026-06-05 12:00 |
19:52:20.58 |
-14:10:29.9 |
HIP 97849 |
27.98 |
| 2026-06-06 00:00 |
19:52:09.09 |
-14:10:51.5 |
HIP 97849 |
28.88 |
| 2026-06-06 12:00 |
19:51:57.41 |
-14:11:13.9 |
HIP 97618 |
27.10 |
| 2026-06-07 00:00 |
19:51:45.52 |
-14:11:37.0 |
HIP 97618 |
25.06 |
| 2026-06-07 12:00 |
19:51:33.44 |
-14:12:01.0 |
HIP 97618 |
23.18 |
| 2026-06-08 00:00 |
19:51:21.16 |
-14:12:25.8 |
HIP 97618 |
21.54 |
| 2026-06-08 12:00 |
19:51:08.69 |
-14:12:51.4 |
HIP 97618 |
20.19 |
| 2026-06-09 00:00 |
19:50:56.03 |
-14:13:17.8 |
HIP 97618 |
19.23 |
| 2026-06-09 12:00 |
19:50:43.18 |
-14:13:45.0 |
HIP 97618 |
18.75 |
| 2026-06-10 00:00 |
19:50:30.13 |
-14:14:13.0 |
HIP 97618 |
18.80 |
| 2026-06-10 12:00 |
19:50:16.90 |
-14:14:41.7 |
HIP 97618 |
19.41 |
| 2026-06-11 00:00 |
19:50:03.48 |
-14:15:11.3 |
HIP 97618 |
20.54 |
| 2026-06-11 12:00 |
19:49:49.87 |
-14:15:41.7 |
HIP 97521 |
21.68 |
| 2026-06-12 00:00 |
19:49:36.08 |
-14:16:12.8 |
HIP 97521 |
20.11 |
| 2026-06-12 12:00 |
19:49:22.11 |
-14:16:44.8 |
HIP 97521 |
18.99 |
| 2026-06-13 00:00 |
19:49:07.96 |
-14:17:17.5 |
HIP 97521 |
18.43 |
| 2026-06-13 12:00 |
19:48:53.63 |
-14:17:51.0 |
HIP 97521 |
18.53 |
| 2026-06-14 00:00 |
19:48:39.11 |
-14:18:25.3 |
HIP 97422 |
18.05 |
| 2026-06-14 12:00 |
19:48:24.43 |
-14:19:00.3 |
HIP 97422 |
16.01 |
| 2026-06-15 00:00 |
19:48:09.57 |
-14:19:36.2 |
HIP 97422 |
14.56 |
| 2026-06-15 12:00 |
19:47:54.54 |
-14:20:12.8 |
HIP 97422 |
13.94 |
| 2026-06-16 00:00 |
19:47:39.33 |
-14:20:50.1 |
HIP 97422 |
14.28 |
| 2026-06-16 12:00 |
19:47:23.96 |
-14:21:28.3 |
HIP 97422 |
15.55 |
| 2026-06-17 00:00 |
19:47:08.43 |
-14:22:07.1 |
HIP 97422 |
17.58 |
| 2026-06-17 12:00 |
19:46:52.73 |
-14:22:46.8 |
HIP 97422 |
20.15 |
| 2026-06-18 00:00 |
19:46:36.87 |
-14:23:27.2 |
HIP 97422 |
23.12 |
| 2026-06-18 12:00 |
19:46:20.85 |
-14:24:08.3 |
HIP 97422 |
26.36 |
| 2026-06-19 00:00 |
19:46:04.68 |
-14:24:50.1 |
HIP 97422 |
29.80 |
| 2026-06-19 12:00 |
19:45:48.35 |
-14:25:32.7 |
HIP 97422 |
33.39 |
| 2026-06-20 00:00 |
19:45:31.86 |
-14:26:16.0 |
HIP 97422 |
37.11 |
| 2026-06-20 12:00 |
19:45:15.23 |
-14:27:00.0 |
HIP 97013 |
34.68 |
| 2026-06-21 00:00 |
19:44:58.45 |
-14:27:44.8 |
HIP 97013 |
31.28 |
| 2026-06-21 12:00 |
19:44:41.53 |
-14:28:30.2 |
HIP 97013 |
28.05 |
| 2026-06-22 00:00 |
19:44:24.46 |
-14:29:16.3 |
HIP 97013 |
25.07 |