메타데이터
| 항목 |
값 |
| Designation |
P/2018 A5 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-09-23T19:44:28.916160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:40Z |
| Obs used |
36 |
| NEO |
- |
| M1 |
17.700 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-12-11.0000000 |
| e |
0.52304780 |
| q (au) |
2.693821 |
| a (au) |
5.647990 |
| i (deg) |
23.577029 |
| Ω (om, deg) |
87.829721 |
| ω (w, deg) |
359.679511 |
| M (ma, deg) |
5.740433 |
밝기
산란 + 전체 선형
$$
M_a = (17.815 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
17.815 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
0.999 |
| δ90 |
1.000 |
| 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) |
| 2026-06-01 00:00 |
19:38:24.20 |
-30:29:23.3 |
HIP 96562 |
13.61 |
| 2026-06-01 12:00 |
19:38:15.48 |
-30:30:31.0 |
HIP 96562 |
13.78 |
| 2026-06-02 00:00 |
19:38:06.63 |
-30:31:38.7 |
HIP 96562 |
14.29 |
| 2026-06-02 12:00 |
19:37:57.66 |
-30:32:46.4 |
HIP 96562 |
15.11 |
| 2026-06-03 00:00 |
19:37:48.57 |
-30:33:54.2 |
HIP 96562 |
16.20 |
| 2026-06-03 12:00 |
19:37:39.36 |
-30:35:02.1 |
HIP 96562 |
17.52 |
| 2026-06-04 00:00 |
19:37:30.03 |
-30:36:10.0 |
HIP 96562 |
19.03 |
| 2026-06-04 12:00 |
19:37:20.58 |
-30:37:17.9 |
HIP 96562 |
20.70 |
| 2026-06-05 00:00 |
19:37:11.01 |
-30:38:25.8 |
HIP 96562 |
22.49 |
| 2026-06-05 12:00 |
19:37:01.33 |
-30:39:33.8 |
HIP 96562 |
24.40 |
| 2026-06-06 00:00 |
19:36:51.53 |
-30:40:41.8 |
HIP 96562 |
26.39 |
| 2026-06-06 12:00 |
19:36:41.61 |
-30:41:49.7 |
HIP 96562 |
28.45 |
| 2026-06-07 00:00 |
19:36:31.58 |
-30:42:57.7 |
HIP 96562 |
30.58 |
| 2026-06-07 12:00 |
19:36:21.43 |
-30:44:05.7 |
HIP 96455 |
31.64 |
| 2026-06-08 00:00 |
19:36:11.17 |
-30:45:13.6 |
HIP 96455 |
30.83 |
| 2026-06-08 12:00 |
19:36:00.80 |
-30:46:21.6 |
HIP 96455 |
30.21 |
| 2026-06-09 00:00 |
19:35:50.32 |
-30:47:29.5 |
HIP 96455 |
29.79 |
| 2026-06-09 12:00 |
19:35:39.73 |
-30:48:37.3 |
HIP 96455 |
29.60 |
| 2026-06-10 00:00 |
19:35:29.03 |
-30:49:45.1 |
HIP 96455 |
29.63 |
| 2026-06-10 12:00 |
19:35:18.22 |
-30:50:52.9 |
HIP 96455 |
29.89 |
| 2026-06-11 00:00 |
19:35:07.30 |
-30:52:00.6 |
HIP 96455 |
30.39 |
| 2026-06-11 12:00 |
19:34:56.28 |
-30:53:08.2 |
HIP 96151 |
30.88 |
| 2026-06-12 00:00 |
19:34:45.15 |
-30:54:15.8 |
HIP 96111 |
29.39 |
| 2026-06-12 12:00 |
19:34:33.92 |
-30:55:23.3 |
HIP 96111 |
27.10 |
| 2026-06-13 00:00 |
19:34:22.59 |
-30:56:30.7 |
HIP 96111 |
24.86 |
| 2026-06-13 12:00 |
19:34:11.16 |
-30:57:38.0 |
HIP 96111 |
22.69 |
| 2026-06-14 00:00 |
19:33:59.63 |
-30:58:45.2 |
HIP 96111 |
20.62 |
| 2026-06-14 12:00 |
19:33:48.00 |
-30:59:52.3 |
HIP 96111 |
18.71 |
| 2026-06-15 00:00 |
19:33:36.27 |
-31:00:59.2 |
HIP 96111 |
17.00 |
| 2026-06-15 12:00 |
19:33:24.45 |
-31:02:06.1 |
HIP 96111 |
15.58 |
| 2026-06-16 00:00 |
19:33:12.53 |
-31:03:12.8 |
HIP 96111 |
14.53 |
| 2026-06-16 12:00 |
19:33:00.52 |
-31:04:19.3 |
HIP 96111 |
13.96 |
| 2026-06-17 00:00 |
19:32:48.42 |
-31:05:25.7 |
HIP 96111 |
13.94 |
| 2026-06-17 12:00 |
19:32:36.23 |
-31:06:32.0 |
HIP 96111 |
14.47 |
| 2026-06-18 00:00 |
19:32:23.95 |
-31:07:38.1 |
HIP 96111 |
15.50 |
| 2026-06-18 12:00 |
19:32:11.59 |
-31:08:44.0 |
HIP 96111 |
16.96 |
| 2026-06-19 00:00 |
19:31:59.14 |
-31:09:49.7 |
HIP 96111 |
18.75 |
| 2026-06-19 12:00 |
19:31:46.61 |
-31:10:55.3 |
HIP 96111 |
20.79 |
| 2026-06-20 00:00 |
19:31:33.99 |
-31:12:00.6 |
HIP 96111 |
23.03 |
| 2026-06-20 12:00 |
19:31:21.30 |
-31:13:05.8 |
HIP 95900 |
24.69 |
| 2026-06-21 00:00 |
19:31:08.52 |
-31:14:10.7 |
HIP 95900 |
24.09 |
| 2026-06-21 12:00 |
19:30:55.67 |
-31:15:15.4 |
HIP 95900 |
23.83 |
| 2026-06-22 00:00 |
19:30:42.74 |
-31:16:19.9 |
HIP 95900 |
23.93 |