메타데이터
| 항목 |
값 |
| Designation |
P/2012 O2 (McNaught) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-06-25T02:23:11.711040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:20Z |
| Obs used |
81 |
| NEO |
- |
| M1 |
17.300 |
| K1 |
10.000 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2012-07-31.0000000 |
| e |
0.53827101 |
| q (au) |
1.660834 |
| a (au) |
3.596989 |
| i (deg) |
24.527455 |
| Ω (om, deg) |
120.813582 |
| ω (w, deg) |
183.047391 |
| M (ma, deg) |
5.186765 |
밝기
산란 + 전체 선형
$$
M_a = (17.976 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
17.976 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.851 |
| 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
찾아보기
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
00:39:58.12 |
-09:31:31.5 |
HIP 3216 |
29.47 |
| 2026-06-01 12:00 |
00:41:09.48 |
-09:30:39.9 |
HIP 3216 |
27.21 |
| 2026-06-02 00:00 |
00:42:20.69 |
-09:29:50.0 |
HIP 3406 |
18.80 |
| 2026-06-02 12:00 |
00:43:31.73 |
-09:29:01.9 |
HIP 3406 |
10.31 |
| 2026-06-03 00:00 |
00:44:42.60 |
-09:28:15.6 |
HIP 3554 |
11.83 |
| 2026-06-03 12:00 |
00:45:53.31 |
-09:27:31.0 |
HIP 3554 |
8.26 |
| 2026-06-04 00:00 |
00:47:03.86 |
-09:26:48.3 |
HIP 3630 |
11.12 |
| 2026-06-04 12:00 |
00:48:14.23 |
-09:26:07.4 |
HIP 3734 |
6.76 |
| 2026-06-05 00:00 |
00:49:24.44 |
-09:25:28.4 |
HIP 3734 |
22.00 |
| 2026-06-05 12:00 |
00:50:34.48 |
-09:24:51.2 |
HIP 3995 |
11.21 |
| 2026-06-06 00:00 |
00:51:44.35 |
-09:24:15.9 |
HIP 3995 |
6.03 |
| 2026-06-06 12:00 |
00:52:54.04 |
-09:23:42.5 |
HIP 4146 |
6.87 |
| 2026-06-07 00:00 |
00:54:03.56 |
-09:23:11.1 |
HIP 4146 |
16.87 |
| 2026-06-07 12:00 |
00:55:12.90 |
-09:22:41.5 |
HIP 4375 |
19.57 |
| 2026-06-08 00:00 |
00:56:22.06 |
-09:22:14.0 |
HIP 4375 |
16.40 |
| 2026-06-08 12:00 |
00:57:31.05 |
-09:21:48.4 |
HIP 4375 |
27.09 |
| 2026-06-09 00:00 |
00:58:39.86 |
-09:21:24.8 |
HIP 4736 |
32.14 |
| 2026-06-09 12:00 |
00:59:48.48 |
-09:21:03.2 |
HIP 4736 |
15.26 |
| 2026-06-10 00:00 |
01:00:56.92 |
-09:20:43.7 |
HIP 4736 |
2.38 |
| 2026-06-10 12:00 |
01:02:05.18 |
-09:20:26.2 |
HIP 4788 |
10.52 |
| 2026-06-11 00:00 |
01:03:13.24 |
-09:20:10.7 |
HIP 4982 |
15.54 |
| 2026-06-11 12:00 |
01:04:21.12 |
-09:19:57.4 |
HIP 4982 |
14.28 |
| 2026-06-12 00:00 |
01:05:28.81 |
-09:19:46.1 |
HIP 4982 |
26.95 |
| 2026-06-12 12:00 |
01:06:36.31 |
-09:19:37.0 |
HIP 5197 |
26.49 |
| 2026-06-13 00:00 |
01:07:43.62 |
-09:19:30.0 |
HIP 5296 |
27.64 |
| 2026-06-13 12:00 |
01:08:50.72 |
-09:19:25.1 |
HIP 5296 |
31.97 |
| 2026-06-14 00:00 |
01:09:57.64 |
-09:19:22.4 |
HIP 5485 |
25.26 |
| 2026-06-14 12:00 |
01:11:04.35 |
-09:19:21.9 |
HIP 5644 |
21.91 |
| 2026-06-15 00:00 |
01:12:10.86 |
-09:19:23.6 |
HIP 5644 |
7.59 |
| 2026-06-15 12:00 |
01:13:17.17 |
-09:19:27.5 |
HIP 5644 |
13.15 |
| 2026-06-16 00:00 |
01:14:23.28 |
-09:19:33.6 |
HIP 5644 |
28.66 |
| 2026-06-16 12:00 |
01:15:29.18 |
-09:19:42.0 |
HIP 5899 |
27.88 |
| 2026-06-17 00:00 |
01:16:34.87 |
-09:19:52.5 |
HIP 5899 |
29.80 |
| 2026-06-17 12:00 |
01:17:40.36 |
-09:20:05.4 |
HIP 6172 |
22.09 |
| 2026-06-18 00:00 |
01:18:45.64 |
-09:20:20.5 |
HIP 6172 |
6.30 |
| 2026-06-18 12:00 |
01:19:50.70 |
-09:20:37.9 |
HIP 6172 |
10.44 |
| 2026-06-19 00:00 |
01:20:55.55 |
-09:20:57.5 |
HIP 6172 |
26.28 |
| 2026-06-19 12:00 |
01:22:00.19 |
-09:21:19.5 |
HIP 6541 |
40.90 |
| 2026-06-20 00:00 |
01:23:04.61 |
-09:21:43.7 |
HIP 6541 |
30.63 |
| 2026-06-20 12:00 |
01:24:08.82 |
-09:22:10.3 |
HIP 6541 |
26.59 |
| 2026-06-21 00:00 |
01:25:12.81 |
-09:22:39.2 |
HIP 6541 |
31.19 |
| 2026-06-21 12:00 |
01:26:16.57 |
-09:23:10.4 |
HIP 6797 |
18.48 |
| 2026-06-22 00:00 |
01:27:20.12 |
-09:23:43.9 |
HIP 6797 |
6.24 |