메타데이터
| 항목 |
값 |
| Designation |
C/2009 F4 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-12-31T20:49:26.964480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:30Z |
| Obs used |
1187 |
| NEO |
- |
| M1 |
5.800 |
| K1 |
7.000 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2011-10-20.0000000 |
| e |
1.00181059 |
| q (au) |
5.454873 |
| a (au) |
-3012.758168 |
| i (deg) |
79.347294 |
| Ω (om, deg) |
53.583284 |
| ω (w, deg) |
260.381258 |
| M (ma, deg) |
-0.000434 |
밝기
산란 + 전체 선형
$$
M_a = (-0.682 + 5.729\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
-0.682 |
| n |
5.729 |
| gf |
0.914 |
| gb |
-0.944 |
| k |
1.000 |
| δ90 |
7.672 |
| 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) |
| 2026-06-01 00:00 |
03:17:30.73 |
+46:38:44.8 |
HIP 15364 |
7.51 |
| 2026-06-01 12:00 |
03:17:35.91 |
+46:39:13.3 |
HIP 15364 |
7.16 |
| 2026-06-02 00:00 |
03:17:41.07 |
+46:39:41.9 |
HIP 15364 |
6.95 |
| 2026-06-02 12:00 |
03:17:46.23 |
+46:40:10.7 |
HIP 15364 |
6.87 |
| 2026-06-03 00:00 |
03:17:51.37 |
+46:40:39.7 |
HIP 15364 |
6.95 |
| 2026-06-03 12:00 |
03:17:56.49 |
+46:41:08.8 |
HIP 15364 |
7.18 |
| 2026-06-04 00:00 |
03:18:01.60 |
+46:41:38.1 |
HIP 15364 |
7.53 |
| 2026-06-04 12:00 |
03:18:06.69 |
+46:42:07.6 |
HIP 15364 |
8.00 |
| 2026-06-05 00:00 |
03:18:11.77 |
+46:42:37.2 |
HIP 15364 |
8.57 |
| 2026-06-05 12:00 |
03:18:16.83 |
+46:43:07.0 |
HIP 15364 |
9.21 |
| 2026-06-06 00:00 |
03:18:21.88 |
+46:43:36.9 |
HIP 15364 |
9.91 |
| 2026-06-06 12:00 |
03:18:26.91 |
+46:44:07.1 |
HIP 15364 |
10.66 |
| 2026-06-07 00:00 |
03:18:31.92 |
+46:44:37.3 |
HIP 15364 |
11.45 |
| 2026-06-07 12:00 |
03:18:36.91 |
+46:45:07.8 |
HIP 15364 |
12.27 |
| 2026-06-08 00:00 |
03:18:41.89 |
+46:45:38.4 |
HIP 15364 |
13.12 |
| 2026-06-08 12:00 |
03:18:46.85 |
+46:46:09.1 |
HIP 15364 |
13.98 |
| 2026-06-09 00:00 |
03:18:51.79 |
+46:46:40.0 |
HIP 15541 |
14.07 |
| 2026-06-09 12:00 |
03:18:56.72 |
+46:47:11.1 |
HIP 15541 |
13.23 |
| 2026-06-10 00:00 |
03:19:01.62 |
+46:47:42.3 |
HIP 15541 |
12.41 |
| 2026-06-10 12:00 |
03:19:06.51 |
+46:48:13.7 |
HIP 15541 |
11.63 |
| 2026-06-11 00:00 |
03:19:11.37 |
+46:48:45.2 |
HIP 15541 |
10.88 |
| 2026-06-11 12:00 |
03:19:16.22 |
+46:49:16.8 |
HIP 15541 |
10.18 |
| 2026-06-12 00:00 |
03:19:21.05 |
+46:49:48.7 |
HIP 15541 |
9.53 |
| 2026-06-12 12:00 |
03:19:25.85 |
+46:50:20.6 |
HIP 15541 |
8.94 |
| 2026-06-13 00:00 |
03:19:30.64 |
+46:50:52.7 |
HIP 15541 |
8.43 |
| 2026-06-13 12:00 |
03:19:35.40 |
+46:51:25.0 |
HIP 15541 |
8.02 |
| 2026-06-14 00:00 |
03:19:40.14 |
+46:51:57.3 |
HIP 15541 |
7.71 |
| 2026-06-14 12:00 |
03:19:44.86 |
+46:52:29.9 |
HIP 15541 |
7.52 |
| 2026-06-15 00:00 |
03:19:49.56 |
+46:53:02.5 |
HIP 15541 |
7.46 |
| 2026-06-15 12:00 |
03:19:54.24 |
+46:53:35.3 |
HIP 15541 |
7.53 |
| 2026-06-16 00:00 |
03:19:58.89 |
+46:54:08.2 |
HIP 15541 |
7.72 |
| 2026-06-16 12:00 |
03:20:03.52 |
+46:54:41.3 |
HIP 15541 |
8.03 |
| 2026-06-17 00:00 |
03:20:08.12 |
+46:55:14.5 |
HIP 15541 |
8.44 |
| 2026-06-17 12:00 |
03:20:12.70 |
+46:55:47.8 |
HIP 15541 |
8.94 |
| 2026-06-18 00:00 |
03:20:17.26 |
+46:56:21.3 |
HIP 15541 |
9.51 |
| 2026-06-18 12:00 |
03:20:21.79 |
+46:56:54.8 |
HIP 15541 |
10.14 |
| 2026-06-19 00:00 |
03:20:26.30 |
+46:57:28.5 |
HIP 15541 |
10.82 |
| 2026-06-19 12:00 |
03:20:30.79 |
+46:58:02.4 |
HIP 15541 |
11.54 |
| 2026-06-20 00:00 |
03:20:35.24 |
+46:58:36.3 |
HIP 15541 |
12.29 |
| 2026-06-20 12:00 |
03:20:39.67 |
+46:59:10.4 |
HIP 15541 |
13.07 |
| 2026-06-21 00:00 |
03:20:44.08 |
+46:59:44.6 |
HIP 15541 |
13.87 |
| 2026-06-21 12:00 |
03:20:48.46 |
+47:00:18.9 |
HIP 15541 |
14.69 |
| 2026-06-22 00:00 |
03:20:52.81 |
+47:00:53.3 |
HIP 15541 |
15.52 |