메타데이터
| 항목 |
값 |
| Designation |
P/2013 J2 (McNaught) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-08-22T23:57:25.464960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:35Z |
| Obs used |
1606 |
| NEO |
- |
| M1 |
12.800 |
| K1 |
7.250 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2013-09-18.0000000 |
| e |
0.65614970 |
| q (au) |
2.147830 |
| a (au) |
6.246411 |
| i (deg) |
15.495560 |
| Ω (om, deg) |
289.393509 |
| ω (w, deg) |
37.889335 |
| M (ma, deg) |
1.641578 |
밝기
산란 + 전체 선형
$$
M_a = (12.546 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
12.546 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.765 |
| 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 |
11:50:42.04 |
-18:00:25.0 |
HIP 57744 |
16.29 |
| 2026-03-26 12:00 |
11:50:28.49 |
-17:59:05.9 |
HIP 57744 |
14.68 |
| 2026-03-27 00:00 |
11:50:14.97 |
-17:57:46.0 |
HIP 57744 |
13.77 |
| 2026-03-27 12:00 |
11:50:01.46 |
-17:56:25.4 |
HIP 57744 |
13.70 |
| 2026-03-28 00:00 |
11:49:47.97 |
-17:55:04.1 |
HIP 57744 |
14.47 |
| 2026-03-28 12:00 |
11:49:34.51 |
-17:53:42.0 |
HIP 57744 |
15.98 |
| 2026-03-29 00:00 |
11:49:21.07 |
-17:52:19.2 |
HIP 57665 |
15.91 |
| 2026-03-29 12:00 |
11:49:07.65 |
-17:50:55.8 |
HIP 57665 |
15.76 |
| 2026-03-30 00:00 |
11:48:54.27 |
-17:49:31.6 |
HIP 57665 |
16.36 |
| 2026-03-30 12:00 |
11:48:40.91 |
-17:48:06.8 |
HIP 57665 |
17.63 |
| 2026-03-31 00:00 |
11:48:27.59 |
-17:46:41.3 |
HIP 57665 |
19.43 |
| 2026-03-31 12:00 |
11:48:14.30 |
-17:45:15.2 |
HIP 57665 |
21.63 |
| 2026-04-01 00:00 |
11:48:01.05 |
-17:43:48.4 |
HIP 57665 |
24.13 |
| 2026-04-01 12:00 |
11:47:47.83 |
-17:42:21.0 |
HIP 57665 |
26.83 |
| 2026-04-02 00:00 |
11:47:34.65 |
-17:40:53.0 |
HIP 57665 |
29.68 |
| 2026-04-02 12:00 |
11:47:21.52 |
-17:39:24.4 |
HIP 57665 |
32.65 |
| 2026-04-03 00:00 |
11:47:08.42 |
-17:37:55.2 |
HIP 57665 |
35.69 |
| 2026-04-03 12:00 |
11:46:55.37 |
-17:36:25.5 |
HIP 57665 |
38.79 |
| 2026-04-04 00:00 |
11:46:42.36 |
-17:34:55.2 |
HIP 57665 |
41.94 |
| 2026-04-04 12:00 |
11:46:29.40 |
-17:33:24.3 |
HIP 57236 |
42.05 |
| 2026-04-05 00:00 |
11:46:16.49 |
-17:31:52.9 |
HIP 57236 |
38.68 |
| 2026-04-05 12:00 |
11:46:03.62 |
-17:30:20.9 |
HIP 57236 |
35.33 |
| 2026-04-06 00:00 |
11:45:50.81 |
-17:28:48.5 |
HIP 57236 |
32.00 |
| 2026-04-06 12:00 |
11:45:38.06 |
-17:27:15.5 |
HIP 57236 |
28.69 |
| 2026-04-07 00:00 |
11:45:25.36 |
-17:25:42.1 |
HIP 57236 |
25.41 |
| 2026-04-07 12:00 |
11:45:12.71 |
-17:24:08.1 |
HIP 57236 |
22.18 |
| 2026-04-08 00:00 |
11:45:00.13 |
-17:22:33.8 |
HIP 57236 |
19.00 |
| 2026-04-08 12:00 |
11:44:47.60 |
-17:20:58.9 |
HIP 57236 |
15.92 |
| 2026-04-09 00:00 |
11:44:35.14 |
-17:19:23.7 |
HIP 57236 |
12.99 |
| 2026-04-09 12:00 |
11:44:22.74 |
-17:17:48.0 |
HIP 57236 |
10.34 |
| 2026-04-10 00:00 |
11:44:10.40 |
-17:16:11.9 |
HIP 57236 |
8.21 |
| 2026-04-10 12:00 |
11:43:58.13 |
-17:14:35.4 |
HIP 57236 |
7.08 |
| 2026-04-11 00:00 |
11:43:45.93 |
-17:12:58.5 |
HIP 57236 |
7.42 |
| 2026-04-11 12:00 |
11:43:33.80 |
-17:11:21.3 |
HIP 57236 |
9.05 |
| 2026-04-12 00:00 |
11:43:21.74 |
-17:09:43.7 |
HIP 57236 |
11.42 |
| 2026-04-12 12:00 |
11:43:09.75 |
-17:08:05.8 |
HIP 57236 |
14.15 |
| 2026-04-13 00:00 |
11:42:57.84 |
-17:06:27.6 |
HIP 57078 |
14.29 |
| 2026-04-13 12:00 |
11:42:46.01 |
-17:04:49.0 |
HIP 57078 |
11.05 |
| 2026-04-14 00:00 |
11:42:34.25 |
-17:03:10.2 |
HIP 57078 |
7.87 |
| 2026-04-14 12:00 |
11:42:22.57 |
-17:01:31.0 |
HIP 57078 |
4.80 |
| 2026-04-15 00:00 |
11:42:10.97 |
-16:59:51.7 |
HIP 57078 |
2.30 |
| 2026-04-15 12:00 |
11:41:59.45 |
-16:58:12.0 |
HIP 57078 |
2.90 |
| 2026-04-16 00:00 |
11:41:48.02 |
-16:56:32.1 |
HIP 57078 |
5.66 |