메타데이터
| 항목 |
값 |
| Designation |
C/1978 A1 (West) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1977-07-21T10:46:21.555840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:26Z |
| Obs used |
60 |
| NEO |
- |
| M1 |
6.000 |
| K1 |
8.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1978-03-26.0000000 |
| e |
1.00269511 |
| q (au) |
5.606239 |
| a (au) |
-2080.153011 |
| i (deg) |
116.921045 |
| Ω (om, deg) |
211.624226 |
| ω (w, deg) |
343.273891 |
| M (ma, deg) |
0.002572 |
밝기
산란 + 전체 선형
$$
M_a = (-0.758 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
-0.758 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.507 |
| 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) |
| 2026-09-20 00:00 |
02:44:51.20 |
+61:30:07.6 |
HIP 12817 |
2.43 |
| 2026-09-20 12:00 |
02:44:48.81 |
+61:30:15.6 |
HIP 12817 |
2.47 |
| 2026-09-21 00:00 |
02:44:46.40 |
+61:30:23.5 |
HIP 12817 |
2.54 |
| 2026-09-21 12:00 |
02:44:43.96 |
+61:30:31.2 |
HIP 12817 |
2.64 |
| 2026-09-22 00:00 |
02:44:41.51 |
+61:30:38.8 |
HIP 12817 |
2.77 |
| 2026-09-22 12:00 |
02:44:39.03 |
+61:30:46.3 |
HIP 12817 |
2.93 |
| 2026-09-23 00:00 |
02:44:36.53 |
+61:30:53.6 |
HIP 12817 |
3.12 |
| 2026-09-23 12:00 |
02:44:34.01 |
+61:31:00.8 |
HIP 12817 |
3.32 |
| 2026-09-24 00:00 |
02:44:31.48 |
+61:31:07.8 |
HIP 12817 |
3.54 |
| 2026-09-24 12:00 |
02:44:28.92 |
+61:31:14.7 |
HIP 12817 |
3.78 |
| 2026-09-25 00:00 |
02:44:26.34 |
+61:31:21.4 |
HIP 12817 |
4.02 |
| 2026-09-25 12:00 |
02:44:23.74 |
+61:31:28.0 |
HIP 12817 |
4.28 |
| 2026-09-26 00:00 |
02:44:21.12 |
+61:31:34.4 |
HIP 12817 |
4.54 |
| 2026-09-26 12:00 |
02:44:18.48 |
+61:31:40.7 |
HIP 12817 |
4.82 |
| 2026-09-27 00:00 |
02:44:15.83 |
+61:31:46.9 |
HIP 12817 |
5.09 |
| 2026-09-27 12:00 |
02:44:13.15 |
+61:31:52.9 |
HIP 12817 |
5.38 |
| 2026-09-28 00:00 |
02:44:10.46 |
+61:31:58.7 |
HIP 12817 |
5.67 |
| 2026-09-28 12:00 |
02:44:07.74 |
+61:32:04.4 |
HIP 12817 |
5.96 |
| 2026-09-29 00:00 |
02:44:05.01 |
+61:32:09.9 |
HIP 12817 |
6.26 |
| 2026-09-29 12:00 |
02:44:02.26 |
+61:32:15.3 |
HIP 12817 |
6.57 |
| 2026-09-30 00:00 |
02:43:59.49 |
+61:32:20.5 |
HIP 12817 |
6.87 |
| 2026-09-30 12:00 |
02:43:56.71 |
+61:32:25.6 |
HIP 12695 |
6.94 |
| 2026-10-01 00:00 |
02:43:53.90 |
+61:32:30.5 |
HIP 12695 |
6.60 |
| 2026-10-01 12:00 |
02:43:51.08 |
+61:32:35.3 |
HIP 12695 |
6.27 |
| 2026-10-02 00:00 |
02:43:48.24 |
+61:32:39.9 |
HIP 12695 |
5.93 |
| 2026-10-02 12:00 |
02:43:45.39 |
+61:32:44.4 |
HIP 12695 |
5.60 |
| 2026-10-03 00:00 |
02:43:42.51 |
+61:32:48.7 |
HIP 12695 |
5.27 |
| 2026-10-03 12:00 |
02:43:39.62 |
+61:32:52.8 |
HIP 12695 |
4.94 |
| 2026-10-04 00:00 |
02:43:36.71 |
+61:32:56.8 |
HIP 12695 |
4.62 |
| 2026-10-04 12:00 |
02:43:33.79 |
+61:33:00.6 |
HIP 12695 |
4.30 |
| 2026-10-05 00:00 |
02:43:30.85 |
+61:33:04.3 |
HIP 12695 |
3.98 |
| 2026-10-05 12:00 |
02:43:27.89 |
+61:33:07.8 |
HIP 12695 |
3.68 |
| 2026-10-06 00:00 |
02:43:24.92 |
+61:33:11.1 |
HIP 12695 |
3.38 |
| 2026-10-06 12:00 |
02:43:21.94 |
+61:33:14.3 |
HIP 12695 |
3.10 |
| 2026-10-07 00:00 |
02:43:18.93 |
+61:33:17.3 |
HIP 12695 |
2.83 |
| 2026-10-07 12:00 |
02:43:15.92 |
+61:33:20.1 |
HIP 12695 |
2.59 |
| 2026-10-08 00:00 |
02:43:12.88 |
+61:33:22.8 |
HIP 12695 |
2.39 |
| 2026-10-08 12:00 |
02:43:09.84 |
+61:33:25.4 |
HIP 12695 |
2.22 |
| 2026-10-09 00:00 |
02:43:06.77 |
+61:33:27.7 |
HIP 12695 |
2.11 |
| 2026-10-09 12:00 |
02:43:03.70 |
+61:33:29.9 |
HIP 12695 |
2.06 |
| 2026-10-10 00:00 |
02:43:00.61 |
+61:33:31.9 |
HIP 12695 |
2.08 |
| 2026-10-10 12:00 |
02:42:57.50 |
+61:33:33.8 |
HIP 12695 |
2.17 |
| 2026-10-11 00:00 |
02:42:54.39 |
+61:33:35.5 |
HIP 12695 |
2.32 |