메타데이터
| 항목 |
값 |
| Designation |
C/1987 W2 (Furuyama) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1988-03-03T01:38:49.009920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:36Z |
| Obs used |
152 |
| NEO |
- |
| M1 |
9.400 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1988-01-12.0000000 |
| e |
1.00023007 |
| q (au) |
1.679522 |
| a (au) |
-7299.904944 |
| i (deg) |
117.781967 |
| Ω (om, deg) |
250.752559 |
| ω (w, deg) |
233.626815 |
| M (ma, deg) |
-0.000081 |
밝기
산란 + 전체 선형
$$
M_a = (4.822 + 5.790\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
4.822 |
| n |
5.790 |
| gf |
0.999 |
| gb |
-0.950 |
| k |
1.000 |
| δ90 |
9.999 |
| 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 |
15:48:30.79 |
+11:12:11.5 |
HIP 77314 |
28.82 |
| 2026-07-29 12:00 |
15:48:30.04 |
+11:12:00.9 |
HIP 77314 |
28.80 |
| 2026-07-30 00:00 |
15:48:29.31 |
+11:11:50.3 |
HIP 77314 |
28.80 |
| 2026-07-30 12:00 |
15:48:28.59 |
+11:11:39.5 |
HIP 77314 |
28.79 |
| 2026-07-31 00:00 |
15:48:27.89 |
+11:11:28.7 |
HIP 77314 |
28.80 |
| 2026-07-31 12:00 |
15:48:27.20 |
+11:11:17.7 |
HIP 77314 |
28.80 |
| 2026-08-01 00:00 |
15:48:26.53 |
+11:11:06.7 |
HIP 77314 |
28.82 |
| 2026-08-01 12:00 |
15:48:25.87 |
+11:10:55.6 |
HIP 77314 |
28.84 |
| 2026-08-02 00:00 |
15:48:25.22 |
+11:10:44.5 |
HIP 77314 |
28.86 |
| 2026-08-02 12:00 |
15:48:24.59 |
+11:10:33.2 |
HIP 77314 |
28.90 |
| 2026-08-03 00:00 |
15:48:23.98 |
+11:10:21.9 |
HIP 77314 |
28.93 |
| 2026-08-03 12:00 |
15:48:23.38 |
+11:10:10.5 |
HIP 77314 |
28.97 |
| 2026-08-04 00:00 |
15:48:22.80 |
+11:09:59.0 |
HIP 77314 |
29.02 |
| 2026-08-04 12:00 |
15:48:22.23 |
+11:09:47.4 |
HIP 77314 |
29.07 |
| 2026-08-05 00:00 |
15:48:21.68 |
+11:09:35.8 |
HIP 77314 |
29.13 |
| 2026-08-05 12:00 |
15:48:21.14 |
+11:09:24.0 |
HIP 77314 |
29.19 |
| 2026-08-06 00:00 |
15:48:20.61 |
+11:09:12.3 |
HIP 77314 |
29.26 |
| 2026-08-06 12:00 |
15:48:20.11 |
+11:09:00.4 |
HIP 77314 |
29.34 |
| 2026-08-07 00:00 |
15:48:19.61 |
+11:08:48.4 |
HIP 77314 |
29.41 |
| 2026-08-07 12:00 |
15:48:19.14 |
+11:08:36.4 |
HIP 77314 |
29.50 |
| 2026-08-08 00:00 |
15:48:18.68 |
+11:08:24.3 |
HIP 77314 |
29.58 |
| 2026-08-08 12:00 |
15:48:18.23 |
+11:08:12.2 |
HIP 77314 |
29.68 |
| 2026-08-09 00:00 |
15:48:17.80 |
+11:08:00.0 |
HIP 77314 |
29.77 |
| 2026-08-09 12:00 |
15:48:17.38 |
+11:07:47.7 |
HIP 77314 |
29.88 |
| 2026-08-10 00:00 |
15:48:16.98 |
+11:07:35.3 |
HIP 77314 |
29.98 |
| 2026-08-10 12:00 |
15:48:16.60 |
+11:07:22.9 |
HIP 77314 |
30.09 |
| 2026-08-11 00:00 |
15:48:16.23 |
+11:07:10.4 |
HIP 77314 |
30.21 |
| 2026-08-11 12:00 |
15:48:15.88 |
+11:06:57.8 |
HIP 77314 |
30.33 |
| 2026-08-12 00:00 |
15:48:15.54 |
+11:06:45.2 |
HIP 77314 |
30.45 |
| 2026-08-12 12:00 |
15:48:15.22 |
+11:06:32.5 |
HIP 77314 |
30.58 |
| 2026-08-13 00:00 |
15:48:14.92 |
+11:06:19.8 |
HIP 77314 |
30.72 |
| 2026-08-13 12:00 |
15:48:14.63 |
+11:06:07.0 |
HIP 77314 |
30.85 |
| 2026-08-14 00:00 |
15:48:14.35 |
+11:05:54.1 |
HIP 77314 |
30.99 |
| 2026-08-14 12:00 |
15:48:14.10 |
+11:05:41.2 |
HIP 77314 |
31.14 |
| 2026-08-15 00:00 |
15:48:13.86 |
+11:05:28.2 |
HIP 77314 |
31.29 |
| 2026-08-15 12:00 |
15:48:13.63 |
+11:05:15.2 |
HIP 77314 |
31.44 |
| 2026-08-16 00:00 |
15:48:13.42 |
+11:05:02.1 |
HIP 77314 |
31.59 |
| 2026-08-16 12:00 |
15:48:13.22 |
+11:04:49.0 |
HIP 77314 |
31.75 |
| 2026-08-17 00:00 |
15:48:13.05 |
+11:04:35.8 |
HIP 77314 |
31.92 |
| 2026-08-17 12:00 |
15:48:12.88 |
+11:04:22.5 |
HIP 77314 |
32.08 |
| 2026-08-18 00:00 |
15:48:12.74 |
+11:04:09.2 |
HIP 77314 |
32.25 |
| 2026-08-18 12:00 |
15:48:12.61 |
+11:03:55.9 |
HIP 77314 |
32.43 |
| 2026-08-19 00:00 |
15:48:12.49 |
+11:03:42.5 |
HIP 77314 |
32.60 |