메타데이터
| 항목 |
값 |
| Designation |
C/2008 J4 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-06-19T09:29:06.619200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:19Z |
| Obs used |
22 |
| NEO |
- |
| M1 |
16.500 |
| K1 |
12.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2008-05-17.0000000 |
| e |
1.00771428 |
| q (au) |
0.449265 |
| a (au) |
-58.238132 |
| i (deg) |
87.477450 |
| Ω (om, deg) |
289.372326 |
| ω (w, deg) |
93.055804 |
| M (ma, deg) |
-0.074059 |
밝기
산란 + 전체 선형
$$
M_a = (16.126 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
16.126 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.885 |
| 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) |
| 2026-09-25 00:00 |
06:53:33.59 |
-56:25:03.9 |
HIP 32980 |
12.40 |
| 2026-09-25 12:00 |
06:53:34.40 |
-56:25:46.6 |
HIP 32980 |
12.20 |
| 2026-09-26 00:00 |
06:53:35.17 |
-56:26:29.5 |
HIP 32980 |
12.04 |
| 2026-09-26 12:00 |
06:53:35.89 |
-56:27:12.4 |
HIP 32980 |
11.92 |
| 2026-09-27 00:00 |
06:53:36.57 |
-56:27:55.3 |
HIP 32980 |
11.83 |
| 2026-09-27 12:00 |
06:53:37.21 |
-56:28:38.3 |
HIP 32980 |
11.78 |
| 2026-09-28 00:00 |
06:53:37.81 |
-56:29:21.3 |
HIP 32980 |
11.76 |
| 2026-09-28 12:00 |
06:53:38.36 |
-56:30:04.4 |
HIP 32980 |
11.79 |
| 2026-09-29 00:00 |
06:53:38.87 |
-56:30:47.5 |
HIP 32980 |
11.85 |
| 2026-09-29 12:00 |
06:53:39.33 |
-56:31:30.6 |
HIP 32980 |
11.95 |
| 2026-09-30 00:00 |
06:53:39.75 |
-56:32:13.8 |
HIP 32980 |
12.09 |
| 2026-09-30 12:00 |
06:53:40.13 |
-56:32:57.0 |
HIP 32980 |
12.26 |
| 2026-10-01 00:00 |
06:53:40.46 |
-56:33:40.2 |
HIP 32980 |
12.47 |
| 2026-10-01 12:00 |
06:53:40.75 |
-56:34:23.5 |
HIP 32980 |
12.71 |
| 2026-10-02 00:00 |
06:53:41.00 |
-56:35:06.7 |
HIP 32980 |
12.97 |
| 2026-10-02 12:00 |
06:53:41.20 |
-56:35:50.0 |
HIP 32980 |
13.27 |
| 2026-10-03 00:00 |
06:53:41.35 |
-56:36:33.4 |
HIP 32980 |
13.59 |
| 2026-10-03 12:00 |
06:53:41.47 |
-56:37:16.7 |
HIP 32980 |
13.94 |
| 2026-10-04 00:00 |
06:53:41.53 |
-56:38:00.0 |
HIP 32980 |
14.31 |
| 2026-10-04 12:00 |
06:53:41.56 |
-56:38:43.4 |
HIP 32980 |
14.70 |
| 2026-10-05 00:00 |
06:53:41.53 |
-56:39:26.7 |
HIP 32978 |
15.10 |
| 2026-10-05 12:00 |
06:53:41.47 |
-56:40:10.1 |
HIP 32978 |
15.51 |
| 2026-10-06 00:00 |
06:53:41.36 |
-56:40:53.4 |
HIP 32978 |
15.93 |
| 2026-10-06 12:00 |
06:53:41.20 |
-56:41:36.7 |
HIP 32978 |
16.37 |
| 2026-10-07 00:00 |
06:53:41.00 |
-56:42:20.1 |
HIP 32978 |
16.83 |
| 2026-10-07 12:00 |
06:53:40.75 |
-56:43:03.4 |
HIP 32978 |
17.30 |
| 2026-10-08 00:00 |
06:53:40.46 |
-56:43:46.7 |
HIP 32978 |
17.79 |
| 2026-10-08 12:00 |
06:53:40.12 |
-56:44:30.0 |
HIP 32978 |
18.28 |
| 2026-10-09 00:00 |
06:53:39.74 |
-56:45:13.2 |
HIP 32978 |
18.78 |
| 2026-10-09 12:00 |
06:53:39.31 |
-56:45:56.5 |
HIP 32978 |
19.30 |
| 2026-10-10 00:00 |
06:53:38.84 |
-56:46:39.7 |
HIP 32978 |
19.82 |
| 2026-10-10 12:00 |
06:53:38.32 |
-56:47:22.9 |
HIP 32978 |
20.35 |
| 2026-10-11 00:00 |
06:53:37.75 |
-56:48:06.0 |
HIP 33324 |
20.38 |
| 2026-10-11 12:00 |
06:53:37.14 |
-56:48:49.1 |
HIP 33324 |
20.17 |
| 2026-10-12 00:00 |
06:53:36.49 |
-56:49:32.1 |
HIP 33324 |
19.98 |
| 2026-10-12 12:00 |
06:53:35.79 |
-56:50:15.1 |
HIP 33324 |
19.82 |
| 2026-10-13 00:00 |
06:53:35.04 |
-56:50:58.1 |
HIP 33324 |
19.70 |
| 2026-10-13 12:00 |
06:53:34.25 |
-56:51:41.0 |
HIP 33324 |
19.61 |
| 2026-10-14 00:00 |
06:53:33.41 |
-56:52:23.9 |
HIP 33324 |
19.55 |
| 2026-10-14 12:00 |
06:53:32.53 |
-56:53:06.6 |
HIP 33324 |
19.52 |
| 2026-10-15 00:00 |
06:53:31.60 |
-56:53:49.4 |
HIP 33324 |
19.53 |
| 2026-10-15 12:00 |
06:53:30.63 |
-56:54:32.0 |
HIP 33324 |
19.57 |
| 2026-10-16 00:00 |
06:53:29.61 |
-56:55:14.6 |
HIP 33324 |
19.64 |