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
$$
M_a = (4.823 + 5.789\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
4.823 |
| n |
5.789 |
| gf |
1.000 |
| gb |
-0.950 |
| 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) |
| 2026-03-26 00:00 |
15:55:01.62 |
+10:55:43.5 |
HIP 78029 |
14.05 |
| 2026-03-26 12:00 |
15:55:00.54 |
+10:55:59.7 |
HIP 78029 |
14.24 |
| 2026-03-27 00:00 |
15:54:59.44 |
+10:56:15.8 |
HIP 78029 |
14.45 |
| 2026-03-27 12:00 |
15:54:58.33 |
+10:56:31.9 |
HIP 78029 |
14.66 |
| 2026-03-28 00:00 |
15:54:57.21 |
+10:56:47.9 |
HIP 78029 |
14.89 |
| 2026-03-28 12:00 |
15:54:56.07 |
+10:57:03.9 |
HIP 78029 |
15.12 |
| 2026-03-29 00:00 |
15:54:54.92 |
+10:57:19.9 |
HIP 78029 |
15.36 |
| 2026-03-29 12:00 |
15:54:53.75 |
+10:57:35.8 |
HIP 78029 |
15.62 |
| 2026-03-30 00:00 |
15:54:52.58 |
+10:57:51.7 |
HIP 78029 |
15.88 |
| 2026-03-30 12:00 |
15:54:51.39 |
+10:58:07.5 |
HIP 78029 |
16.15 |
| 2026-03-31 00:00 |
15:54:50.18 |
+10:58:23.3 |
HIP 78029 |
16.43 |
| 2026-03-31 12:00 |
15:54:48.97 |
+10:58:39.0 |
HIP 78029 |
16.72 |
| 2026-04-01 00:00 |
15:54:47.74 |
+10:58:54.7 |
HIP 78029 |
17.01 |
| 2026-04-01 12:00 |
15:54:46.50 |
+10:59:10.4 |
HIP 78029 |
17.31 |
| 2026-04-02 00:00 |
15:54:45.24 |
+10:59:26.0 |
HIP 78029 |
17.62 |
| 2026-04-02 12:00 |
15:54:43.98 |
+10:59:41.5 |
HIP 78029 |
17.94 |
| 2026-04-03 00:00 |
15:54:42.70 |
+10:59:57.0 |
HIP 78029 |
18.26 |
| 2026-04-03 12:00 |
15:54:41.40 |
+11:00:12.5 |
HIP 78029 |
18.59 |
| 2026-04-04 00:00 |
15:54:40.10 |
+11:00:27.9 |
HIP 78029 |
18.92 |
| 2026-04-04 12:00 |
15:54:38.78 |
+11:00:43.2 |
HIP 78029 |
19.26 |
| 2026-04-05 00:00 |
15:54:37.45 |
+11:00:58.5 |
HIP 78029 |
19.61 |
| 2026-04-05 12:00 |
15:54:36.11 |
+11:01:13.7 |
HIP 78029 |
19.96 |
| 2026-04-06 00:00 |
15:54:34.76 |
+11:01:28.9 |
HIP 78029 |
20.32 |
| 2026-04-06 12:00 |
15:54:33.40 |
+11:01:44.0 |
HIP 78029 |
20.68 |
| 2026-04-07 00:00 |
15:54:32.02 |
+11:01:59.0 |
HIP 78029 |
21.04 |
| 2026-04-07 12:00 |
15:54:30.63 |
+11:02:14.0 |
HIP 78029 |
21.42 |
| 2026-04-08 00:00 |
15:54:29.23 |
+11:02:28.9 |
HIP 78029 |
21.79 |
| 2026-04-08 12:00 |
15:54:27.82 |
+11:02:43.8 |
HIP 78029 |
22.17 |
| 2026-04-09 00:00 |
15:54:26.40 |
+11:02:58.6 |
HIP 78029 |
22.56 |
| 2026-04-09 12:00 |
15:54:24.97 |
+11:03:13.3 |
HIP 78029 |
22.94 |
| 2026-04-10 00:00 |
15:54:23.52 |
+11:03:28.0 |
HIP 78029 |
23.34 |
| 2026-04-10 12:00 |
15:54:22.07 |
+11:03:42.6 |
HIP 78029 |
23.73 |
| 2026-04-11 00:00 |
15:54:20.60 |
+11:03:57.2 |
HIP 77847 |
23.96 |
| 2026-04-11 12:00 |
15:54:19.12 |
+11:04:11.6 |
HIP 77847 |
23.59 |
| 2026-04-12 00:00 |
15:54:17.63 |
+11:04:26.0 |
HIP 77847 |
23.23 |
| 2026-04-12 12:00 |
15:54:16.14 |
+11:04:40.3 |
HIP 77847 |
22.87 |
| 2026-04-13 00:00 |
15:54:14.63 |
+11:04:54.6 |
HIP 77847 |
22.51 |
| 2026-04-13 12:00 |
15:54:13.11 |
+11:05:08.8 |
HIP 77847 |
22.15 |
| 2026-04-14 00:00 |
15:54:11.58 |
+11:05:22.9 |
HIP 77847 |
21.80 |
| 2026-04-14 12:00 |
15:54:10.04 |
+11:05:36.9 |
HIP 77847 |
21.45 |
| 2026-04-15 00:00 |
15:54:08.49 |
+11:05:50.8 |
HIP 77847 |
21.11 |
| 2026-04-15 12:00 |
15:54:06.93 |
+11:06:04.7 |
HIP 77847 |
20.77 |
| 2026-04-16 00:00 |
15:54:05.36 |
+11:06:18.5 |
HIP 77847 |
20.43 |