메타데이터
| 항목 |
값 |
| Designation |
C/2009 F5 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-11-04T19:50:20.624640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:30Z |
| Obs used |
444 |
| NEO |
- |
| M1 |
12.800 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2009-05-07.0000000 |
| e |
0.97199145 |
| q (au) |
2.245337 |
| a (au) |
80.166145 |
| i (deg) |
84.990355 |
| Ω (om, deg) |
219.064143 |
| ω (w, deg) |
297.366826 |
| M (ma, deg) |
0.251524 |
밝기
산란 + 전체 선형
$$
M_a = (14.104 + 2.537\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
14.104 |
| n |
2.537 |
| gf |
1.000 |
| gb |
-0.637 |
| k |
0.800 |
| 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) |
| 2026-07-29 00:00 |
18:27:04.87 |
+64:29:37.9 |
HIP 90274 |
24.03 |
| 2026-07-29 12:00 |
18:26:58.45 |
+64:29:13.7 |
HIP 90274 |
24.04 |
| 2026-07-30 00:00 |
18:26:52.07 |
+64:28:49.2 |
HIP 90274 |
24.09 |
| 2026-07-30 12:00 |
18:26:45.72 |
+64:28:24.2 |
HIP 90274 |
24.16 |
| 2026-07-31 00:00 |
18:26:39.42 |
+64:27:58.9 |
HIP 90274 |
24.27 |
| 2026-07-31 12:00 |
18:26:33.15 |
+64:27:33.2 |
HIP 90274 |
24.42 |
| 2026-08-01 00:00 |
18:26:26.92 |
+64:27:07.1 |
HIP 90274 |
24.59 |
| 2026-08-01 12:00 |
18:26:20.73 |
+64:26:40.6 |
HIP 90274 |
24.80 |
| 2026-08-02 00:00 |
18:26:14.58 |
+64:26:13.8 |
HIP 90274 |
25.04 |
| 2026-08-02 12:00 |
18:26:08.47 |
+64:25:46.6 |
HIP 90274 |
25.30 |
| 2026-08-03 00:00 |
18:26:02.40 |
+64:25:19.0 |
HIP 90274 |
25.60 |
| 2026-08-03 12:00 |
18:25:56.37 |
+64:24:51.0 |
HIP 90274 |
25.92 |
| 2026-08-04 00:00 |
18:25:50.39 |
+64:24:22.7 |
HIP 90274 |
26.27 |
| 2026-08-04 12:00 |
18:25:44.45 |
+64:23:54.0 |
HIP 90274 |
26.65 |
| 2026-08-05 00:00 |
18:25:38.55 |
+64:23:25.0 |
HIP 90274 |
27.05 |
| 2026-08-05 12:00 |
18:25:32.69 |
+64:22:55.5 |
HIP 90274 |
27.48 |
| 2026-08-06 00:00 |
18:25:26.88 |
+64:22:25.8 |
HIP 90274 |
27.92 |
| 2026-08-06 12:00 |
18:25:21.11 |
+64:21:55.6 |
HIP 90274 |
28.39 |
| 2026-08-07 00:00 |
18:25:15.38 |
+64:21:25.1 |
HIP 90274 |
28.88 |
| 2026-08-07 12:00 |
18:25:09.70 |
+64:20:54.3 |
HIP 90274 |
29.39 |
| 2026-08-08 00:00 |
18:25:04.07 |
+64:20:23.1 |
HIP 90274 |
29.92 |
| 2026-08-08 12:00 |
18:24:58.49 |
+64:19:51.6 |
HIP 90274 |
30.46 |
| 2026-08-09 00:00 |
18:24:52.95 |
+64:19:19.7 |
HIP 89867 |
30.52 |
| 2026-08-09 12:00 |
18:24:47.45 |
+64:18:47.4 |
HIP 89867 |
29.82 |
| 2026-08-10 00:00 |
18:24:42.01 |
+64:18:14.9 |
HIP 89867 |
29.13 |
| 2026-08-10 12:00 |
18:24:36.61 |
+64:17:42.0 |
HIP 89867 |
28.45 |
| 2026-08-11 00:00 |
18:24:31.27 |
+64:17:08.7 |
HIP 89867 |
27.78 |
| 2026-08-11 12:00 |
18:24:25.97 |
+64:16:35.2 |
HIP 89867 |
27.13 |
| 2026-08-12 00:00 |
18:24:20.72 |
+64:16:01.2 |
HIP 89867 |
26.48 |
| 2026-08-12 12:00 |
18:24:15.52 |
+64:15:27.0 |
HIP 89867 |
25.85 |
| 2026-08-13 00:00 |
18:24:10.37 |
+64:14:52.5 |
HIP 89867 |
25.23 |
| 2026-08-13 12:00 |
18:24:05.28 |
+64:14:17.6 |
HIP 89867 |
24.63 |
| 2026-08-14 00:00 |
18:24:00.23 |
+64:13:42.4 |
HIP 89867 |
24.04 |
| 2026-08-14 12:00 |
18:23:55.24 |
+64:13:06.9 |
HIP 89867 |
23.47 |
| 2026-08-15 00:00 |
18:23:50.30 |
+64:12:31.1 |
HIP 89867 |
22.92 |
| 2026-08-15 12:00 |
18:23:45.41 |
+64:11:55.0 |
HIP 89867 |
22.39 |
| 2026-08-16 00:00 |
18:23:40.57 |
+64:11:18.6 |
HIP 89867 |
21.89 |
| 2026-08-16 12:00 |
18:23:35.79 |
+64:10:41.9 |
HIP 89867 |
21.40 |
| 2026-08-17 00:00 |
18:23:31.06 |
+64:10:04.8 |
HIP 89867 |
20.95 |
| 2026-08-17 12:00 |
18:23:26.39 |
+64:09:27.5 |
HIP 89867 |
20.52 |
| 2026-08-18 00:00 |
18:23:21.77 |
+64:08:49.9 |
HIP 89867 |
20.12 |
| 2026-08-18 12:00 |
18:23:17.20 |
+64:08:12.0 |
HIP 89867 |
19.75 |
| 2026-08-19 00:00 |
18:23:12.69 |
+64:07:33.9 |
HIP 89867 |
19.41 |