메타데이터
| 항목 |
값 |
| Designation |
P/2016 A7 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-02-25T20:41:32.879040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:21Z |
| Obs used |
46 |
| NEO |
- |
| M1 |
7.800 |
| K1 |
33.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2016-03-18.0000000 |
| e |
0.56662578 |
| q (au) |
2.176649 |
| a (au) |
5.022563 |
| i (deg) |
16.637470 |
| Ω (om, deg) |
221.466093 |
| ω (w, deg) |
352.469583 |
| M (ma, deg) |
1.850871 |
밝기
산란 + 전체 선형
$$
M_a = (13.342 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
13.342 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-07-29 00:00 |
08:25:31.11 |
+06:33:23.4 |
HIP 41129 |
33.75 |
| 2026-07-29 12:00 |
08:26:13.04 |
+06:30:54.9 |
HIP 41550 |
33.73 |
| 2026-07-30 00:00 |
08:26:55.00 |
+06:28:25.3 |
HIP 41550 |
25.38 |
| 2026-07-30 12:00 |
08:27:37.00 |
+06:25:54.7 |
HIP 41550 |
19.52 |
| 2026-07-31 00:00 |
08:28:19.04 |
+06:23:22.9 |
HIP 41584 |
16.92 |
| 2026-07-31 12:00 |
08:29:01.11 |
+06:20:50.0 |
HIP 41584 |
14.10 |
| 2026-08-01 00:00 |
08:29:43.21 |
+06:18:16.1 |
HIP 41584 |
18.53 |
| 2026-08-01 12:00 |
08:30:25.35 |
+06:15:41.0 |
HIP 41584 |
26.83 |
| 2026-08-02 00:00 |
08:31:07.52 |
+06:13:04.8 |
HIP 41584 |
36.46 |
| 2026-08-02 12:00 |
08:31:49.73 |
+06:10:27.6 |
HIP 41898 |
29.84 |
| 2026-08-03 00:00 |
08:32:31.97 |
+06:07:49.2 |
HIP 41898 |
24.80 |
| 2026-08-03 12:00 |
08:33:14.24 |
+06:05:09.8 |
HIP 41898 |
23.96 |
| 2026-08-04 00:00 |
08:33:56.55 |
+06:02:29.2 |
HIP 41898 |
27.71 |
| 2026-08-04 12:00 |
08:34:38.88 |
+05:59:47.5 |
HIP 42076 |
29.59 |
| 2026-08-05 00:00 |
08:35:21.26 |
+05:57:04.8 |
HIP 42283 |
28.81 |
| 2026-08-05 12:00 |
08:36:03.66 |
+05:54:20.9 |
HIP 42283 |
18.87 |
| 2026-08-06 00:00 |
08:36:46.09 |
+05:51:36.0 |
HIP 42283 |
10.95 |
| 2026-08-06 12:00 |
08:37:28.56 |
+05:48:49.9 |
HIP 42313 |
7.13 |
| 2026-08-07 00:00 |
08:38:11.05 |
+05:46:02.8 |
HIP 42313 |
8.75 |
| 2026-08-07 12:00 |
08:38:53.58 |
+05:43:14.5 |
HIP 42488 |
12.75 |
| 2026-08-08 00:00 |
08:39:36.13 |
+05:40:25.2 |
HIP 42488 |
5.79 |
| 2026-08-08 12:00 |
08:40:18.72 |
+05:37:34.8 |
HIP 42488 |
12.05 |
| 2026-08-09 00:00 |
08:41:01.33 |
+05:34:43.2 |
HIP 42635 |
12.48 |
| 2026-08-09 12:00 |
08:41:43.98 |
+05:31:50.6 |
HIP 42635 |
10.78 |
| 2026-08-10 00:00 |
08:42:26.65 |
+05:28:56.9 |
HIP 42635 |
17.84 |
| 2026-08-10 12:00 |
08:43:09.34 |
+05:26:02.2 |
HIP 42804 |
10.21 |
| 2026-08-11 00:00 |
08:43:52.07 |
+05:23:06.3 |
HIP 42899 |
11.42 |
| 2026-08-11 12:00 |
08:44:34.82 |
+05:20:09.4 |
HIP 42899 |
3.14 |
| 2026-08-12 00:00 |
08:45:17.59 |
+05:17:11.3 |
HIP 42899 |
11.55 |
| 2026-08-12 12:00 |
08:46:00.40 |
+05:14:12.2 |
HIP 43047 |
4.25 |
| 2026-08-13 00:00 |
08:46:43.22 |
+05:11:12.1 |
HIP 43047 |
9.73 |
| 2026-08-13 12:00 |
08:47:26.07 |
+05:08:10.8 |
HIP 43047 |
20.43 |
| 2026-08-14 00:00 |
08:48:08.94 |
+05:05:08.5 |
HIP 43047 |
31.41 |
| 2026-08-14 12:00 |
08:48:51.84 |
+05:02:05.1 |
HIP 43306 |
41.63 |
| 2026-08-15 00:00 |
08:49:34.76 |
+04:59:00.7 |
HIP 43516 |
33.03 |
| 2026-08-15 12:00 |
08:50:17.70 |
+04:55:55.2 |
HIP 43516 |
22.24 |
| 2026-08-16 00:00 |
08:51:00.66 |
+04:52:48.6 |
HIP 43516 |
12.10 |
| 2026-08-16 12:00 |
08:51:43.65 |
+04:49:41.0 |
HIP 43516 |
6.81 |
| 2026-08-17 00:00 |
08:52:26.65 |
+04:46:32.3 |
HIP 43516 |
14.00 |
| 2026-08-17 12:00 |
08:53:09.68 |
+04:43:22.6 |
HIP 43539 |
22.59 |
| 2026-08-18 00:00 |
08:53:52.72 |
+04:40:11.9 |
HIP 43819 |
25.59 |
| 2026-08-18 12:00 |
08:54:35.79 |
+04:37:00.1 |
HIP 43819 |
18.36 |
| 2026-08-19 00:00 |
08:55:18.87 |
+04:33:47.2 |
HIP 43819 |
16.44 |