C/1991 T2 (Shoemaker-Levy)
메타데이터
| 항목 |
값 |
| Designation |
C/1991 T2 (Shoemaker-Levy) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1992-07-24T12:09:31.147200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:41Z |
| Obs used |
212 |
| NEO |
- |
| M1 |
7.800 |
| K1 |
10.750 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1992-03-10.0000000 |
| e |
0.99986094 |
| q (au) |
0.836262 |
| a (au) |
6013.613507 |
| i (deg) |
113.496746 |
| Ω (om, deg) |
49.049164 |
| ω (w, deg) |
145.238453 |
| M (ma, deg) |
359.999711 |
밝기
산란 + 전체 선형
$$
M_a = (8.493 + 3.615\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.493 |
| n |
3.615 |
| gf |
0.800 |
| gb |
-0.594 |
| k |
0.800 |
| δ90 |
2.404 |
| 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 |
| 1991-10-06 |
1991-11-27 |
+10.9849 |
-5.757 |
| 1991-11-27 |
1992-04-16 |
+1.8252 |
-0.861 |
| 1992-04-16 |
1992-07-24 |
-0.2983 |
+0.013 |
| 1992-07-24 |
1992-08-19 |
+3.5301 |
+0.260 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
05:05:15.70 |
-21:07:36.9 |
HIP 23671 |
7.90 |
| 2026-02-03 12:00 |
05:05:14.43 |
-21:07:19.3 |
HIP 23671 |
8.21 |
| 2026-02-04 00:00 |
05:05:13.18 |
-21:07:01.7 |
HIP 23671 |
8.53 |
| 2026-02-04 12:00 |
05:05:11.94 |
-21:06:43.9 |
HIP 23671 |
8.86 |
| 2026-02-05 00:00 |
05:05:10.71 |
-21:06:26.1 |
HIP 23671 |
9.20 |
| 2026-02-05 12:00 |
05:05:09.51 |
-21:06:08.1 |
HIP 23671 |
9.55 |
| 2026-02-06 00:00 |
05:05:08.32 |
-21:05:50.0 |
HIP 23620 |
9.67 |
| 2026-02-06 12:00 |
05:05:07.15 |
-21:05:31.8 |
HIP 23620 |
9.73 |
| 2026-02-07 00:00 |
05:05:06.00 |
-21:05:13.5 |
HIP 23620 |
9.82 |
| 2026-02-07 12:00 |
05:05:04.86 |
-21:04:55.1 |
HIP 23620 |
9.93 |
| 2026-02-08 00:00 |
05:05:03.74 |
-21:04:36.5 |
HIP 23620 |
10.05 |
| 2026-02-08 12:00 |
05:05:02.64 |
-21:04:17.9 |
HIP 23620 |
10.20 |
| 2026-02-09 00:00 |
05:05:01.55 |
-21:03:59.2 |
HIP 23620 |
10.36 |
| 2026-02-09 12:00 |
05:05:00.49 |
-21:03:40.3 |
HIP 23620 |
10.53 |
| 2026-02-10 00:00 |
05:04:59.44 |
-21:03:21.4 |
HIP 23620 |
10.72 |
| 2026-02-10 12:00 |
05:04:58.40 |
-21:03:02.4 |
HIP 23620 |
10.93 |
| 2026-02-11 00:00 |
05:04:57.39 |
-21:02:43.3 |
HIP 23620 |
11.15 |
| 2026-02-11 12:00 |
05:04:56.40 |
-21:02:24.1 |
HIP 23620 |
11.38 |
| 2026-02-12 00:00 |
05:04:55.42 |
-21:02:04.7 |
HIP 23620 |
11.62 |
| 2026-02-12 12:00 |
05:04:54.46 |
-21:01:45.3 |
HIP 23620 |
11.87 |
| 2026-02-13 00:00 |
05:04:53.52 |
-21:01:25.9 |
HIP 23620 |
12.14 |
| 2026-02-13 12:00 |
05:04:52.59 |
-21:01:06.3 |
HIP 23620 |
12.41 |
| 2026-02-14 00:00 |
05:04:51.69 |
-21:00:46.6 |
HIP 23620 |
12.69 |
| 2026-02-14 12:00 |
05:04:50.80 |
-21:00:26.9 |
HIP 23620 |
12.98 |
| 2026-02-15 00:00 |
05:04:49.93 |
-21:00:07.0 |
HIP 23620 |
13.28 |
| 2026-02-15 12:00 |
05:04:49.08 |
-20:59:47.1 |
HIP 23620 |
13.58 |
| 2026-02-16 00:00 |
05:04:48.25 |
-20:59:27.1 |
HIP 23620 |
13.89 |
| 2026-02-16 12:00 |
05:04:47.44 |
-20:59:07.0 |
HIP 23620 |
14.20 |
| 2026-02-17 00:00 |
05:04:46.64 |
-20:58:46.9 |
HIP 23620 |
14.52 |
| 2026-02-17 12:00 |
05:04:45.86 |
-20:58:26.7 |
HIP 23620 |
14.84 |
| 2026-02-18 00:00 |
05:04:45.11 |
-20:58:06.3 |
HIP 23620 |
15.17 |
| 2026-02-18 12:00 |
05:04:44.37 |
-20:57:46.0 |
HIP 23620 |
15.50 |
| 2026-02-19 00:00 |
05:04:43.65 |
-20:57:25.5 |
HIP 23620 |
15.83 |
| 2026-02-19 12:00 |
05:04:42.95 |
-20:57:05.0 |
HIP 23620 |
16.17 |
| 2026-02-20 00:00 |
05:04:42.26 |
-20:56:44.4 |
HIP 23620 |
16.51 |
| 2026-02-20 12:00 |
05:04:41.60 |
-20:56:23.8 |
HIP 23620 |
16.86 |
| 2026-02-21 00:00 |
05:04:40.96 |
-20:56:03.1 |
HIP 23620 |
17.20 |
| 2026-02-21 12:00 |
05:04:40.33 |
-20:55:42.3 |
HIP 23620 |
17.55 |
| 2026-02-22 00:00 |
05:04:39.72 |
-20:55:21.5 |
HIP 23620 |
17.90 |
| 2026-02-22 12:00 |
05:04:39.14 |
-20:55:00.6 |
HIP 23620 |
18.25 |
| 2026-02-23 00:00 |
05:04:38.57 |
-20:54:39.7 |
HIP 23620 |
18.61 |
| 2026-02-23 12:00 |
05:04:38.02 |
-20:54:18.7 |
HIP 23620 |
18.96 |
| 2026-02-24 00:00 |
05:04:37.49 |
-20:53:57.6 |
HIP 23620 |
19.32 |