메타데이터
| 항목 |
값 |
| Designation |
C/1987 B1 (Nishikawa-Takamizawa-Tago) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1987-03-17T08:17:23.208000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:33Z |
| Obs used |
87 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
5.750 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1987-02-26.0000000 |
| e |
0.99579827 |
| q (au) |
0.869588 |
| a (au) |
206.959563 |
| i (deg) |
172.229985 |
| Ω (om, deg) |
176.010516 |
| ω (w, deg) |
200.401841 |
| M (ma, deg) |
359.993596 |
밝기
산란 + 전체 선형
$$
M_a = (6.240 + 4.361\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
6.240 |
| n |
4.361 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.996 |
| δ90 |
1.000 |
| 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 |
11:18:49.21 |
+05:34:14.8 |
HIP 55232 |
27.06 |
| 2026-09-20 12:00 |
11:18:50.87 |
+05:34:04.4 |
HIP 55232 |
26.93 |
| 2026-09-21 00:00 |
11:18:52.54 |
+05:33:54.0 |
HIP 55232 |
26.81 |
| 2026-09-21 12:00 |
11:18:54.20 |
+05:33:43.6 |
HIP 55232 |
26.70 |
| 2026-09-22 00:00 |
11:18:55.86 |
+05:33:33.2 |
HIP 55232 |
26.60 |
| 2026-09-22 12:00 |
11:18:57.52 |
+05:33:22.9 |
HIP 55232 |
26.50 |
| 2026-09-23 00:00 |
11:18:59.18 |
+05:33:12.6 |
HIP 55232 |
26.41 |
| 2026-09-23 12:00 |
11:19:00.83 |
+05:33:02.3 |
HIP 55232 |
26.32 |
| 2026-09-24 00:00 |
11:19:02.48 |
+05:32:52.0 |
HIP 55232 |
26.25 |
| 2026-09-24 12:00 |
11:19:04.13 |
+05:32:41.8 |
HIP 55232 |
26.18 |
| 2026-09-25 00:00 |
11:19:05.77 |
+05:32:31.6 |
HIP 55232 |
26.12 |
| 2026-09-25 12:00 |
11:19:07.41 |
+05:32:21.4 |
HIP 55232 |
26.07 |
| 2026-09-26 00:00 |
11:19:09.05 |
+05:32:11.2 |
HIP 55232 |
26.02 |
| 2026-09-26 12:00 |
11:19:10.68 |
+05:32:01.1 |
HIP 55232 |
25.98 |
| 2026-09-27 00:00 |
11:19:12.31 |
+05:31:51.0 |
HIP 55232 |
25.95 |
| 2026-09-27 12:00 |
11:19:13.94 |
+05:31:40.9 |
HIP 55321 |
25.85 |
| 2026-09-28 00:00 |
11:19:15.56 |
+05:31:30.8 |
HIP 55321 |
25.58 |
| 2026-09-28 12:00 |
11:19:17.18 |
+05:31:20.8 |
HIP 55321 |
25.32 |
| 2026-09-29 00:00 |
11:19:18.80 |
+05:31:10.8 |
HIP 55321 |
25.06 |
| 2026-09-29 12:00 |
11:19:20.41 |
+05:31:00.8 |
HIP 55321 |
24.80 |
| 2026-09-30 00:00 |
11:19:22.01 |
+05:30:50.9 |
HIP 55321 |
24.55 |
| 2026-09-30 12:00 |
11:19:23.62 |
+05:30:41.0 |
HIP 55321 |
24.31 |
| 2026-10-01 00:00 |
11:19:25.21 |
+05:30:31.1 |
HIP 55321 |
24.07 |
| 2026-10-01 12:00 |
11:19:26.81 |
+05:30:21.3 |
HIP 55321 |
23.84 |
| 2026-10-02 00:00 |
11:19:28.40 |
+05:30:11.5 |
HIP 55321 |
23.62 |
| 2026-10-02 12:00 |
11:19:29.98 |
+05:30:01.7 |
HIP 55321 |
23.40 |
| 2026-10-03 00:00 |
11:19:31.56 |
+05:29:51.9 |
HIP 55321 |
23.19 |
| 2026-10-03 12:00 |
11:19:33.13 |
+05:29:42.2 |
HIP 55321 |
22.98 |
| 2026-10-04 00:00 |
11:19:34.70 |
+05:29:32.6 |
HIP 55321 |
22.78 |
| 2026-10-04 12:00 |
11:19:36.26 |
+05:29:22.9 |
HIP 55321 |
22.59 |
| 2026-10-05 00:00 |
11:19:37.82 |
+05:29:13.4 |
HIP 55321 |
22.41 |
| 2026-10-05 12:00 |
11:19:39.37 |
+05:29:03.8 |
HIP 55321 |
22.23 |
| 2026-10-06 00:00 |
11:19:40.92 |
+05:28:54.3 |
HIP 55321 |
22.06 |
| 2026-10-06 12:00 |
11:19:42.46 |
+05:28:44.8 |
HIP 55321 |
21.90 |
| 2026-10-07 00:00 |
11:19:43.99 |
+05:28:35.4 |
HIP 55321 |
21.74 |
| 2026-10-07 12:00 |
11:19:45.52 |
+05:28:26.0 |
HIP 55321 |
21.59 |
| 2026-10-08 00:00 |
11:19:47.05 |
+05:28:16.7 |
HIP 55321 |
21.45 |
| 2026-10-08 12:00 |
11:19:48.56 |
+05:28:07.4 |
HIP 55321 |
21.32 |
| 2026-10-09 00:00 |
11:19:50.07 |
+05:27:58.1 |
HIP 55321 |
21.20 |
| 2026-10-09 12:00 |
11:19:51.58 |
+05:27:48.9 |
HIP 55321 |
21.08 |
| 2026-10-10 00:00 |
11:19:53.07 |
+05:27:39.8 |
HIP 55321 |
20.97 |
| 2026-10-10 12:00 |
11:19:54.56 |
+05:27:30.6 |
HIP 55321 |
20.87 |
| 2026-10-11 00:00 |
11:19:56.05 |
+05:27:21.6 |
HIP 55321 |
20.77 |