메타데이터
| 항목 |
값 |
| Designation |
C/2018 F4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-12-04T01:26:15.930240Z |
| Orbit solution date (soln_date, UTC) |
2023-04-24T19:06:39Z |
| Obs used |
530 |
| NEO |
- |
| M1 |
5.300 |
| K1 |
13.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2018-03-17T12:40:26.976000Z |
| Discovery magnitude (MPC) |
20.40 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-09-20.0000000 |
| e |
1.00152144 |
| q (au) |
3.439968 |
| a (au) |
-2260.993631 |
| i (deg) |
78.098889 |
| Ω (om, deg) |
26.507082 |
| ω (w, deg) |
263.204195 |
| M (ma, deg) |
-0.000688 |
밝기
산란 + 전체 선형
$$
M_a = (5.479 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
5.479 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.616 |
| 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 |
| 2018-03-17 |
2019-12-03 |
-4.5179 |
+3.714 |
| 2019-12-04 |
2020-09-08 |
+3.2670 |
-2.149 |
| 2020-09-08 |
2021-01-03 |
+3.3546 |
-2.816 |
| 2021-01-03 |
2021-11-06 |
+2.1461 |
-1.581 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
01:22:59.36 |
+38:02:09.4 |
HIP 6514 |
20.90 |
| 2026-05-12 12:00 |
01:23:06.00 |
+38:03:17.2 |
HIP 6514 |
21.50 |
| 2026-05-13 00:00 |
01:23:12.60 |
+38:04:25.3 |
HIP 6514 |
22.22 |
| 2026-05-13 12:00 |
01:23:19.18 |
+38:05:33.6 |
HIP 6514 |
23.05 |
| 2026-05-14 00:00 |
01:23:25.73 |
+38:06:42.0 |
HIP 6514 |
23.98 |
| 2026-05-14 12:00 |
01:23:32.24 |
+38:07:50.7 |
HIP 6514 |
25.00 |
| 2026-05-15 00:00 |
01:23:38.73 |
+38:08:59.6 |
HIP 6514 |
26.10 |
| 2026-05-15 12:00 |
01:23:45.18 |
+38:10:08.6 |
HIP 6514 |
27.26 |
| 2026-05-16 00:00 |
01:23:51.60 |
+38:11:17.9 |
HIP 6514 |
28.48 |
| 2026-05-16 12:00 |
01:23:57.99 |
+38:12:27.3 |
HIP 6514 |
29.76 |
| 2026-05-17 00:00 |
01:24:04.35 |
+38:13:37.0 |
HIP 6514 |
31.07 |
| 2026-05-17 12:00 |
01:24:10.67 |
+38:14:46.8 |
HIP 6514 |
32.43 |
| 2026-05-18 00:00 |
01:24:16.96 |
+38:15:56.7 |
HIP 6658 |
33.50 |
| 2026-05-18 12:00 |
01:24:23.21 |
+38:17:06.9 |
HIP 6658 |
31.95 |
| 2026-05-19 00:00 |
01:24:29.43 |
+38:18:17.2 |
HIP 6658 |
30.41 |
| 2026-05-19 12:00 |
01:24:35.62 |
+38:19:27.7 |
HIP 6658 |
28.89 |
| 2026-05-20 00:00 |
01:24:41.77 |
+38:20:38.4 |
HIP 6658 |
27.38 |
| 2026-05-20 12:00 |
01:24:47.88 |
+38:21:49.2 |
HIP 6658 |
25.90 |
| 2026-05-21 00:00 |
01:24:53.95 |
+38:23:00.2 |
HIP 6658 |
24.45 |
| 2026-05-21 12:00 |
01:25:00.00 |
+38:24:11.3 |
HIP 6658 |
23.02 |
| 2026-05-22 00:00 |
01:25:06.00 |
+38:25:22.5 |
HIP 6658 |
21.63 |
| 2026-05-22 12:00 |
01:25:11.96 |
+38:26:34.0 |
HIP 6658 |
20.28 |
| 2026-05-23 00:00 |
01:25:17.89 |
+38:27:45.5 |
HIP 6658 |
18.98 |
| 2026-05-23 12:00 |
01:25:23.78 |
+38:28:57.2 |
HIP 6658 |
17.73 |
| 2026-05-24 00:00 |
01:25:29.63 |
+38:30:09.1 |
HIP 6658 |
16.56 |
| 2026-05-24 12:00 |
01:25:35.44 |
+38:31:21.1 |
HIP 6658 |
15.47 |
| 2026-05-25 00:00 |
01:25:41.21 |
+38:32:33.2 |
HIP 6658 |
14.48 |
| 2026-05-25 12:00 |
01:25:46.94 |
+38:33:45.4 |
HIP 6658 |
13.62 |
| 2026-05-26 00:00 |
01:25:52.63 |
+38:34:57.8 |
HIP 6658 |
12.90 |
| 2026-05-26 12:00 |
01:25:58.28 |
+38:36:10.3 |
HIP 6658 |
12.36 |
| 2026-05-27 00:00 |
01:26:03.89 |
+38:37:22.9 |
HIP 6658 |
12.00 |
| 2026-05-27 12:00 |
01:26:09.46 |
+38:38:35.6 |
HIP 6658 |
11.86 |
| 2026-05-28 00:00 |
01:26:14.98 |
+38:39:48.5 |
HIP 6658 |
11.93 |
| 2026-05-28 12:00 |
01:26:20.47 |
+38:41:01.5 |
HIP 6658 |
12.21 |
| 2026-05-29 00:00 |
01:26:25.91 |
+38:42:14.5 |
HIP 6658 |
12.68 |
| 2026-05-29 12:00 |
01:26:31.31 |
+38:43:27.7 |
HIP 6658 |
13.32 |
| 2026-05-30 00:00 |
01:26:36.66 |
+38:44:41.0 |
HIP 6658 |
14.11 |
| 2026-05-30 12:00 |
01:26:41.97 |
+38:45:54.4 |
HIP 6658 |
15.02 |
| 2026-05-31 00:00 |
01:26:47.24 |
+38:47:07.8 |
HIP 6658 |
16.03 |
| 2026-05-31 12:00 |
01:26:52.47 |
+38:48:21.4 |
HIP 6658 |
17.12 |
| 2026-06-01 00:00 |
01:26:57.65 |
+38:49:35.1 |
HIP 6658 |
18.28 |
| 2026-06-01 12:00 |
01:27:02.78 |
+38:50:48.8 |
HIP 6658 |
19.49 |
| 2026-06-02 00:00 |
01:27:07.87 |
+38:52:02.7 |
HIP 6658 |
20.74 |