C/2018 A1 (PANSTARRS)
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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2018-01-06 |
2018-03-28 |
-19.1803 |
+7.963 |
| 2018-03-28 |
2018-06-11 |
+62.5363 |
-30.876 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
12:10:39.96 |
-53:03:10.2 |
HIP 59395 |
3.90 |
| 2026-02-03 12:00 |
12:10:33.93 |
-53:04:02.0 |
HIP 59395 |
5.02 |
| 2026-02-04 00:00 |
12:10:27.83 |
-53:04:53.3 |
HIP 59395 |
6.20 |
| 2026-02-04 12:00 |
12:10:21.66 |
-53:05:43.9 |
HIP 59395 |
7.40 |
| 2026-02-05 00:00 |
12:10:15.42 |
-53:06:34.0 |
HIP 59395 |
8.62 |
| 2026-02-05 12:00 |
12:10:09.10 |
-53:07:23.4 |
HIP 59395 |
9.86 |
| 2026-02-06 00:00 |
12:10:02.72 |
-53:08:12.2 |
HIP 59395 |
11.10 |
| 2026-02-06 12:00 |
12:09:56.27 |
-53:09:00.4 |
HIP 59395 |
12.35 |
| 2026-02-07 00:00 |
12:09:49.75 |
-53:09:48.0 |
HIP 59395 |
13.60 |
| 2026-02-07 12:00 |
12:09:43.16 |
-53:10:34.9 |
HIP 59395 |
14.85 |
| 2026-02-08 00:00 |
12:09:36.51 |
-53:11:21.3 |
HIP 59395 |
16.11 |
| 2026-02-08 12:00 |
12:09:29.78 |
-53:12:06.9 |
HIP 59395 |
17.37 |
| 2026-02-09 00:00 |
12:09:22.99 |
-53:12:52.0 |
HIP 59395 |
18.64 |
| 2026-02-09 12:00 |
12:09:16.14 |
-53:13:36.4 |
HIP 59172 |
18.64 |
| 2026-02-10 00:00 |
12:09:09.22 |
-53:14:20.2 |
HIP 59172 |
18.67 |
| 2026-02-10 12:00 |
12:09:02.23 |
-53:15:03.3 |
HIP 59172 |
18.77 |
| 2026-02-11 00:00 |
12:08:55.18 |
-53:15:45.7 |
HIP 59172 |
18.95 |
| 2026-02-11 12:00 |
12:08:48.07 |
-53:16:27.6 |
HIP 59172 |
19.19 |
| 2026-02-12 00:00 |
12:08:40.89 |
-53:17:08.7 |
HIP 59172 |
19.51 |
| 2026-02-12 12:00 |
12:08:33.65 |
-53:17:49.2 |
HIP 59172 |
19.88 |
| 2026-02-13 00:00 |
12:08:26.35 |
-53:18:29.0 |
HIP 59172 |
20.32 |
| 2026-02-13 12:00 |
12:08:18.99 |
-53:19:08.1 |
HIP 59172 |
20.81 |
| 2026-02-14 00:00 |
12:08:11.57 |
-53:19:46.6 |
HIP 59172 |
21.36 |
| 2026-02-14 12:00 |
12:08:04.08 |
-53:20:24.4 |
HIP 59172 |
21.96 |
| 2026-02-15 00:00 |
12:07:56.54 |
-53:21:01.4 |
HIP 59172 |
22.61 |
| 2026-02-15 12:00 |
12:07:48.94 |
-53:21:37.9 |
HIP 59172 |
23.29 |
| 2026-02-16 00:00 |
12:07:41.28 |
-53:22:13.6 |
HIP 59172 |
24.02 |
| 2026-02-16 12:00 |
12:07:33.57 |
-53:22:48.6 |
HIP 59172 |
24.79 |
| 2026-02-17 00:00 |
12:07:25.80 |
-53:23:22.9 |
HIP 59172 |
25.58 |
| 2026-02-17 12:00 |
12:07:17.97 |
-53:23:56.5 |
HIP 59172 |
26.41 |
| 2026-02-18 00:00 |
12:07:10.09 |
-53:24:29.5 |
HIP 59172 |
27.27 |
| 2026-02-18 12:00 |
12:07:02.16 |
-53:25:01.7 |
HIP 59172 |
28.15 |
| 2026-02-19 00:00 |
12:06:54.17 |
-53:25:33.2 |
HIP 58820 |
27.43 |
| 2026-02-19 12:00 |
12:06:46.13 |
-53:26:04.0 |
HIP 58820 |
26.16 |
| 2026-02-20 00:00 |
12:06:38.03 |
-53:26:34.1 |
HIP 58820 |
24.90 |
| 2026-02-20 12:00 |
12:06:29.89 |
-53:27:03.4 |
HIP 58820 |
23.63 |
| 2026-02-21 00:00 |
12:06:21.70 |
-53:27:32.1 |
HIP 58820 |
22.36 |
| 2026-02-21 12:00 |
12:06:13.46 |
-53:28:00.0 |
HIP 58820 |
21.10 |
| 2026-02-22 00:00 |
12:06:05.17 |
-53:28:27.2 |
HIP 58820 |
19.83 |
| 2026-02-22 12:00 |
12:05:56.83 |
-53:28:53.7 |
HIP 58820 |
18.56 |
| 2026-02-23 00:00 |
12:05:48.44 |
-53:29:19.4 |
HIP 58820 |
17.30 |
| 2026-02-23 12:00 |
12:05:40.01 |
-53:29:44.5 |
HIP 58820 |
16.03 |
| 2026-02-24 00:00 |
12:05:31.54 |
-53:30:08.7 |
HIP 58820 |
14.77 |