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) |
| 2026-09-20 00:00 |
18:58:58.66 |
-32:31:02.0 |
HIP 93289 |
20.95 |
| 2026-09-20 12:00 |
18:58:57.99 |
-32:30:48.4 |
HIP 93289 |
20.88 |
| 2026-09-21 00:00 |
18:58:57.47 |
-32:30:34.5 |
HIP 93289 |
20.78 |
| 2026-09-21 12:00 |
18:58:57.10 |
-32:30:20.4 |
HIP 93289 |
20.66 |
| 2026-09-22 00:00 |
18:58:56.89 |
-32:30:05.9 |
HIP 93289 |
20.52 |
| 2026-09-22 12:00 |
18:58:56.83 |
-32:29:51.3 |
HIP 93289 |
20.35 |
| 2026-09-23 00:00 |
18:58:56.93 |
-32:29:36.4 |
HIP 93289 |
20.16 |
| 2026-09-23 12:00 |
18:58:57.17 |
-32:29:21.2 |
HIP 93289 |
19.95 |
| 2026-09-24 00:00 |
18:58:57.57 |
-32:29:05.8 |
HIP 93289 |
19.71 |
| 2026-09-24 12:00 |
18:58:58.12 |
-32:28:50.1 |
HIP 93289 |
19.45 |
| 2026-09-25 00:00 |
18:58:58.83 |
-32:28:34.3 |
HIP 93289 |
19.16 |
| 2026-09-25 12:00 |
18:58:59.68 |
-32:28:18.1 |
HIP 93289 |
18.84 |
| 2026-09-26 00:00 |
18:59:00.69 |
-32:28:01.8 |
HIP 93289 |
18.50 |
| 2026-09-26 12:00 |
18:59:01.84 |
-32:27:45.2 |
HIP 93289 |
18.13 |
| 2026-09-27 00:00 |
18:59:03.15 |
-32:27:28.4 |
HIP 93289 |
17.74 |
| 2026-09-27 12:00 |
18:59:04.61 |
-32:27:11.4 |
HIP 93289 |
17.32 |
| 2026-09-28 00:00 |
18:59:06.22 |
-32:26:54.2 |
HIP 93289 |
16.88 |
| 2026-09-28 12:00 |
18:59:07.98 |
-32:26:36.7 |
HIP 93289 |
16.41 |
| 2026-09-29 00:00 |
18:59:09.90 |
-32:26:19.0 |
HIP 93289 |
15.91 |
| 2026-09-29 12:00 |
18:59:11.96 |
-32:26:01.1 |
HIP 93289 |
15.39 |
| 2026-09-30 00:00 |
18:59:14.17 |
-32:25:43.0 |
HIP 93289 |
14.84 |
| 2026-09-30 12:00 |
18:59:16.53 |
-32:25:24.7 |
HIP 93289 |
14.28 |
| 2026-10-01 00:00 |
18:59:19.04 |
-32:25:06.2 |
HIP 93289 |
13.68 |
| 2026-10-01 12:00 |
18:59:21.70 |
-32:24:47.5 |
HIP 93289 |
13.07 |
| 2026-10-02 00:00 |
18:59:24.51 |
-32:24:28.6 |
HIP 93289 |
12.43 |
| 2026-10-02 12:00 |
18:59:27.47 |
-32:24:09.5 |
HIP 93289 |
11.78 |
| 2026-10-03 00:00 |
18:59:30.58 |
-32:23:50.2 |
HIP 93289 |
11.10 |
| 2026-10-03 12:00 |
18:59:33.83 |
-32:23:30.7 |
HIP 93289 |
10.42 |
| 2026-10-04 00:00 |
18:59:37.24 |
-32:23:11.1 |
HIP 93289 |
9.72 |
| 2026-10-04 12:00 |
18:59:40.79 |
-32:22:51.2 |
HIP 93289 |
9.02 |
| 2026-10-05 00:00 |
18:59:44.49 |
-32:22:31.1 |
HIP 93289 |
8.32 |
| 2026-10-05 12:00 |
18:59:48.34 |
-32:22:10.9 |
HIP 93289 |
7.63 |
| 2026-10-06 00:00 |
18:59:52.33 |
-32:21:50.5 |
HIP 93289 |
6.98 |
| 2026-10-06 12:00 |
18:59:56.48 |
-32:21:29.9 |
HIP 93289 |
6.38 |
| 2026-10-07 00:00 |
19:00:00.77 |
-32:21:09.1 |
HIP 93289 |
5.85 |
| 2026-10-07 12:00 |
19:00:05.20 |
-32:20:48.1 |
HIP 93289 |
5.46 |
| 2026-10-08 00:00 |
19:00:09.79 |
-32:20:27.0 |
HIP 93289 |
5.22 |
| 2026-10-08 12:00 |
19:00:14.51 |
-32:20:05.7 |
HIP 93289 |
5.20 |
| 2026-10-09 00:00 |
19:00:19.39 |
-32:19:44.3 |
HIP 93289 |
5.40 |
| 2026-10-09 12:00 |
19:00:24.41 |
-32:19:22.6 |
HIP 93289 |
5.83 |
| 2026-10-10 00:00 |
19:00:29.57 |
-32:19:00.8 |
HIP 93289 |
6.45 |
| 2026-10-10 12:00 |
19:00:34.88 |
-32:18:38.9 |
HIP 93289 |
7.22 |
| 2026-10-11 00:00 |
19:00:40.33 |
-32:18:16.8 |
HIP 93289 |
8.13 |