메타데이터
| 항목 |
값 |
| Designation |
C/1987 T1 (Levy) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1987-09-09T04:04:28.231680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:33Z |
| Obs used |
18 |
| NEO |
- |
| M1 |
9.200 |
| K1 |
31.750 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1987-10-24.0000000 |
| e |
0.99999043 |
| q (au) |
0.515261 |
| a (au) |
53860.674252 |
| i (deg) |
62.532659 |
| Ω (om, deg) |
143.730188 |
| ω (w, deg) |
13.191234 |
| M (ma, deg) |
0.000004 |
밝기
산란 + 전체 선형
$$
M_a = (7.708 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.708 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
21:54:08.84 |
-15:33:33.8 |
HIP 108078 |
8.98 |
| 2026-07-29 12:00 |
21:54:07.17 |
-15:33:43.4 |
HIP 108078 |
8.94 |
| 2026-07-30 00:00 |
21:54:05.49 |
-15:33:53.0 |
HIP 108078 |
8.93 |
| 2026-07-30 12:00 |
21:54:03.80 |
-15:34:02.6 |
HIP 108078 |
8.94 |
| 2026-07-31 00:00 |
21:54:02.11 |
-15:34:12.3 |
HIP 108078 |
8.97 |
| 2026-07-31 12:00 |
21:54:00.42 |
-15:34:21.9 |
HIP 108078 |
9.02 |
| 2026-08-01 00:00 |
21:53:58.72 |
-15:34:31.6 |
HIP 108078 |
9.10 |
| 2026-08-01 12:00 |
21:53:57.01 |
-15:34:41.3 |
HIP 108078 |
9.19 |
| 2026-08-02 00:00 |
21:53:55.30 |
-15:34:51.0 |
HIP 108078 |
9.30 |
| 2026-08-02 12:00 |
21:53:53.59 |
-15:35:00.7 |
HIP 108078 |
9.44 |
| 2026-08-03 00:00 |
21:53:51.87 |
-15:35:10.4 |
HIP 108078 |
9.59 |
| 2026-08-03 12:00 |
21:53:50.15 |
-15:35:20.2 |
HIP 108078 |
9.76 |
| 2026-08-04 00:00 |
21:53:48.42 |
-15:35:29.9 |
HIP 108078 |
9.94 |
| 2026-08-04 12:00 |
21:53:46.69 |
-15:35:39.7 |
HIP 108078 |
10.15 |
| 2026-08-05 00:00 |
21:53:44.96 |
-15:35:49.4 |
HIP 108078 |
10.37 |
| 2026-08-05 12:00 |
21:53:43.22 |
-15:35:59.2 |
HIP 108078 |
10.60 |
| 2026-08-06 00:00 |
21:53:41.47 |
-15:36:09.0 |
HIP 108078 |
10.85 |
| 2026-08-06 12:00 |
21:53:39.73 |
-15:36:18.7 |
HIP 108078 |
11.11 |
| 2026-08-07 00:00 |
21:53:37.98 |
-15:36:28.5 |
HIP 108078 |
11.38 |
| 2026-08-07 12:00 |
21:53:36.23 |
-15:36:38.3 |
HIP 108078 |
11.67 |
| 2026-08-08 00:00 |
21:53:34.47 |
-15:36:48.1 |
HIP 108078 |
11.96 |
| 2026-08-08 12:00 |
21:53:32.71 |
-15:36:57.9 |
HIP 108078 |
12.27 |
| 2026-08-09 00:00 |
21:53:30.95 |
-15:37:07.7 |
HIP 108078 |
12.58 |
| 2026-08-09 12:00 |
21:53:29.18 |
-15:37:17.5 |
HIP 108078 |
12.91 |
| 2026-08-10 00:00 |
21:53:27.42 |
-15:37:27.3 |
HIP 108078 |
13.24 |
| 2026-08-10 12:00 |
21:53:25.65 |
-15:37:37.1 |
HIP 108078 |
13.58 |
| 2026-08-11 00:00 |
21:53:23.87 |
-15:37:46.9 |
HIP 108078 |
13.92 |
| 2026-08-11 12:00 |
21:53:22.10 |
-15:37:56.7 |
HIP 108078 |
14.27 |
| 2026-08-12 00:00 |
21:53:20.32 |
-15:38:06.5 |
HIP 108078 |
14.63 |
| 2026-08-12 12:00 |
21:53:18.54 |
-15:38:16.3 |
HIP 108078 |
15.00 |
| 2026-08-13 00:00 |
21:53:16.76 |
-15:38:26.1 |
HIP 108078 |
15.37 |
| 2026-08-13 12:00 |
21:53:14.98 |
-15:38:35.9 |
HIP 108078 |
15.74 |
| 2026-08-14 00:00 |
21:53:13.20 |
-15:38:45.7 |
HIP 108078 |
16.12 |
| 2026-08-14 12:00 |
21:53:11.41 |
-15:38:55.5 |
HIP 108078 |
16.50 |
| 2026-08-15 00:00 |
21:53:09.63 |
-15:39:05.3 |
HIP 108078 |
16.89 |
| 2026-08-15 12:00 |
21:53:07.84 |
-15:39:15.1 |
HIP 108078 |
17.28 |
| 2026-08-16 00:00 |
21:53:06.05 |
-15:39:24.8 |
HIP 108078 |
17.67 |
| 2026-08-16 12:00 |
21:53:04.26 |
-15:39:34.6 |
HIP 108078 |
18.07 |
| 2026-08-17 00:00 |
21:53:02.47 |
-15:39:44.3 |
HIP 108078 |
18.47 |
| 2026-08-17 12:00 |
21:53:00.68 |
-15:39:54.0 |
HIP 108078 |
18.87 |
| 2026-08-18 00:00 |
21:52:58.89 |
-15:40:03.8 |
HIP 108078 |
19.28 |
| 2026-08-18 12:00 |
21:52:57.10 |
-15:40:13.5 |
HIP 108078 |
19.69 |
| 2026-08-19 00:00 |
21:52:55.31 |
-15:40:23.2 |
HIP 108078 |
20.10 |