메타데이터
| 항목 |
값 |
| Designation |
C/2018 A1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-10-20T10:16:17.644800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:39Z |
| Obs used |
118 |
| NEO |
- |
| M1 |
15.100 |
| K1 |
5.000 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-02-06.0000000 |
| e |
0.90438598 |
| q (au) |
2.419351 |
| a (au) |
25.303307 |
| i (deg) |
53.559981 |
| Ω (om, deg) |
336.621053 |
| ω (w, deg) |
96.385267 |
| M (ma, deg) |
0.840729 |
밝기
산란 + 전체 선형
$$
M_a = (16.981 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
16.981 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.738 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
11:41:43.81 |
-51:32:00.7 |
HIP 57157 |
22.62 |
| 2026-06-01 12:00 |
11:41:41.90 |
-51:30:52.0 |
HIP 56853 |
22.29 |
| 2026-06-02 00:00 |
11:41:40.08 |
-51:29:43.3 |
HIP 56853 |
21.77 |
| 2026-06-02 12:00 |
11:41:38.34 |
-51:28:34.7 |
HIP 56853 |
21.31 |
| 2026-06-03 00:00 |
11:41:36.67 |
-51:27:26.2 |
HIP 56853 |
20.92 |
| 2026-06-03 12:00 |
11:41:35.08 |
-51:26:17.8 |
HIP 56853 |
20.60 |
| 2026-06-04 00:00 |
11:41:33.58 |
-51:25:09.4 |
HIP 56853 |
20.36 |
| 2026-06-04 12:00 |
11:41:32.14 |
-51:24:01.2 |
HIP 56853 |
20.19 |
| 2026-06-05 00:00 |
11:41:30.79 |
-51:22:53.0 |
HIP 56853 |
20.10 |
| 2026-06-05 12:00 |
11:41:29.52 |
-51:21:45.0 |
HIP 56853 |
20.08 |
| 2026-06-06 00:00 |
11:41:28.32 |
-51:20:37.1 |
HIP 56853 |
20.15 |
| 2026-06-06 12:00 |
11:41:27.20 |
-51:19:29.3 |
HIP 56853 |
20.29 |
| 2026-06-07 00:00 |
11:41:26.17 |
-51:18:21.6 |
HIP 56853 |
20.50 |
| 2026-06-07 12:00 |
11:41:25.20 |
-51:17:14.0 |
HIP 56853 |
20.78 |
| 2026-06-08 00:00 |
11:41:24.32 |
-51:16:06.6 |
HIP 56853 |
21.13 |
| 2026-06-08 12:00 |
11:41:23.51 |
-51:14:59.3 |
HIP 56853 |
21.55 |
| 2026-06-09 00:00 |
11:41:22.79 |
-51:13:52.1 |
HIP 56853 |
22.02 |
| 2026-06-09 12:00 |
11:41:22.14 |
-51:12:45.2 |
HIP 56853 |
22.55 |
| 2026-06-10 00:00 |
11:41:21.57 |
-51:11:38.3 |
HIP 56853 |
23.13 |
| 2026-06-10 12:00 |
11:41:21.07 |
-51:10:31.7 |
HIP 56853 |
23.75 |
| 2026-06-11 00:00 |
11:41:20.66 |
-51:09:25.2 |
HIP 56853 |
24.42 |
| 2026-06-11 12:00 |
11:41:20.32 |
-51:08:18.8 |
HIP 56853 |
25.12 |
| 2026-06-12 00:00 |
11:41:20.06 |
-51:07:12.7 |
HIP 56853 |
25.86 |
| 2026-06-12 12:00 |
11:41:19.87 |
-51:06:06.7 |
HIP 56853 |
26.63 |
| 2026-06-13 00:00 |
11:41:19.77 |
-51:05:01.0 |
HIP 56853 |
27.43 |
| 2026-06-13 12:00 |
11:41:19.74 |
-51:03:55.4 |
HIP 57052 |
26.70 |
| 2026-06-14 00:00 |
11:41:19.79 |
-51:02:50.1 |
HIP 57052 |
25.62 |
| 2026-06-14 12:00 |
11:41:19.91 |
-51:01:44.9 |
HIP 57052 |
24.54 |
| 2026-06-15 00:00 |
11:41:20.11 |
-51:00:40.0 |
HIP 57052 |
23.47 |
| 2026-06-15 12:00 |
11:41:20.39 |
-50:59:35.3 |
HIP 57052 |
22.40 |
| 2026-06-16 00:00 |
11:41:20.75 |
-50:58:30.8 |
HIP 57052 |
21.33 |
| 2026-06-16 12:00 |
11:41:21.18 |
-50:57:26.5 |
HIP 57052 |
20.27 |
| 2026-06-17 00:00 |
11:41:21.69 |
-50:56:22.5 |
HIP 57052 |
19.21 |
| 2026-06-17 12:00 |
11:41:22.27 |
-50:55:18.7 |
HIP 57052 |
18.15 |
| 2026-06-18 00:00 |
11:41:22.93 |
-50:54:15.2 |
HIP 57052 |
17.09 |
| 2026-06-18 12:00 |
11:41:23.67 |
-50:53:12.0 |
HIP 57052 |
16.04 |
| 2026-06-19 00:00 |
11:41:24.48 |
-50:52:09.0 |
HIP 57052 |
14.98 |
| 2026-06-19 12:00 |
11:41:25.36 |
-50:51:06.2 |
HIP 57052 |
13.93 |
| 2026-06-20 00:00 |
11:41:26.32 |
-50:50:03.8 |
HIP 57052 |
12.88 |
| 2026-06-20 12:00 |
11:41:27.36 |
-50:49:01.6 |
HIP 57052 |
11.84 |
| 2026-06-21 00:00 |
11:41:28.47 |
-50:47:59.7 |
HIP 57052 |
10.80 |
| 2026-06-21 12:00 |
11:41:29.65 |
-50:46:58.1 |
HIP 57052 |
9.75 |
| 2026-06-22 00:00 |
11:41:30.91 |
-50:45:56.7 |
HIP 57052 |
8.72 |