C/1987 A1 (Levy)
메타데이터
| 항목 |
값 |
| Designation |
C/1987 A1 (Levy) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1986-12-17T12:41:46.420800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:33Z |
| Obs used |
62 |
| NEO |
- |
| M1 |
10.800 |
| K1 |
21.250 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1987-02-19.0000000 |
| e |
1.00039441 |
| q (au) |
0.921480 |
| a (au) |
-2336.349359 |
| i (deg) |
96.582920 |
| Ω (om, deg) |
17.116643 |
| ω (w, deg) |
95.245094 |
| M (ma, deg) |
0.000554 |
밝기
산란 + 전체 선형
$$
M_a = (9.559 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
9.559 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-02-03 00:00 |
07:22:43.13 |
-61:57:25.1 |
HIP 35676 |
7.30 |
| 2026-02-03 12:00 |
07:22:39.45 |
-61:57:13.1 |
HIP 35676 |
6.86 |
| 2026-02-04 00:00 |
07:22:35.78 |
-61:57:00.8 |
HIP 35676 |
6.43 |
| 2026-02-04 12:00 |
07:22:32.13 |
-61:56:48.3 |
HIP 35676 |
6.00 |
| 2026-02-05 00:00 |
07:22:28.50 |
-61:56:35.6 |
HIP 35676 |
5.59 |
| 2026-02-05 12:00 |
07:22:24.89 |
-61:56:22.7 |
HIP 35676 |
5.20 |
| 2026-02-06 00:00 |
07:22:21.29 |
-61:56:09.5 |
HIP 35676 |
4.81 |
| 2026-02-06 12:00 |
07:22:17.70 |
-61:55:56.1 |
HIP 35676 |
4.45 |
| 2026-02-07 00:00 |
07:22:14.14 |
-61:55:42.5 |
HIP 35676 |
4.12 |
| 2026-02-07 12:00 |
07:22:10.59 |
-61:55:28.7 |
HIP 35676 |
3.82 |
| 2026-02-08 00:00 |
07:22:07.06 |
-61:55:14.7 |
HIP 35676 |
3.57 |
| 2026-02-08 12:00 |
07:22:03.55 |
-61:55:00.4 |
HIP 35676 |
3.36 |
| 2026-02-09 00:00 |
07:22:00.05 |
-61:54:46.0 |
HIP 35676 |
3.22 |
| 2026-02-09 12:00 |
07:21:56.58 |
-61:54:31.3 |
HIP 35676 |
3.15 |
| 2026-02-10 00:00 |
07:21:53.12 |
-61:54:16.4 |
HIP 35676 |
3.15 |
| 2026-02-10 12:00 |
07:21:49.68 |
-61:54:01.3 |
HIP 35676 |
3.23 |
| 2026-02-11 00:00 |
07:21:46.27 |
-61:53:46.0 |
HIP 35676 |
3.38 |
| 2026-02-11 12:00 |
07:21:42.87 |
-61:53:30.5 |
HIP 35676 |
3.59 |
| 2026-02-12 00:00 |
07:21:39.49 |
-61:53:14.8 |
HIP 35676 |
3.85 |
| 2026-02-12 12:00 |
07:21:36.13 |
-61:52:58.9 |
HIP 35676 |
4.15 |
| 2026-02-13 00:00 |
07:21:32.79 |
-61:52:42.8 |
HIP 35676 |
4.48 |
| 2026-02-13 12:00 |
07:21:29.48 |
-61:52:26.4 |
HIP 35676 |
4.85 |
| 2026-02-14 00:00 |
07:21:26.18 |
-61:52:09.9 |
HIP 35676 |
5.23 |
| 2026-02-14 12:00 |
07:21:22.91 |
-61:51:53.1 |
HIP 35676 |
5.63 |
| 2026-02-15 00:00 |
07:21:19.65 |
-61:51:36.2 |
HIP 35676 |
6.04 |
| 2026-02-15 12:00 |
07:21:16.42 |
-61:51:19.1 |
HIP 35676 |
6.46 |
| 2026-02-16 00:00 |
07:21:13.21 |
-61:51:01.8 |
HIP 35676 |
6.89 |
| 2026-02-16 12:00 |
07:21:10.03 |
-61:50:44.2 |
HIP 35676 |
7.33 |
| 2026-02-17 00:00 |
07:21:06.86 |
-61:50:26.5 |
HIP 35676 |
7.78 |
| 2026-02-17 12:00 |
07:21:03.72 |
-61:50:08.6 |
HIP 35676 |
8.22 |
| 2026-02-18 00:00 |
07:21:00.61 |
-61:49:50.5 |
HIP 35676 |
8.68 |
| 2026-02-18 12:00 |
07:20:57.51 |
-61:49:32.2 |
HIP 35676 |
9.13 |
| 2026-02-19 00:00 |
07:20:54.44 |
-61:49:13.8 |
HIP 35676 |
9.59 |
| 2026-02-19 12:00 |
07:20:51.39 |
-61:48:55.1 |
HIP 35676 |
10.05 |
| 2026-02-20 00:00 |
07:20:48.37 |
-61:48:36.3 |
HIP 35676 |
10.52 |
| 2026-02-20 12:00 |
07:20:45.37 |
-61:48:17.3 |
HIP 35676 |
10.98 |
| 2026-02-21 00:00 |
07:20:42.40 |
-61:47:58.1 |
HIP 35676 |
11.45 |
| 2026-02-21 12:00 |
07:20:39.45 |
-61:47:38.7 |
HIP 35676 |
11.92 |
| 2026-02-22 00:00 |
07:20:36.53 |
-61:47:19.1 |
HIP 35676 |
12.39 |
| 2026-02-22 12:00 |
07:20:33.63 |
-61:46:59.4 |
HIP 35676 |
12.86 |
| 2026-02-23 00:00 |
07:20:30.75 |
-61:46:39.5 |
HIP 35676 |
13.33 |
| 2026-02-23 12:00 |
07:20:27.91 |
-61:46:19.5 |
HIP 35676 |
13.80 |
| 2026-02-24 00:00 |
07:20:25.08 |
-61:45:59.2 |
HIP 35676 |
14.27 |