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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
01:27:12.92 |
+38:53:16.6 |
HIP 6658 |
22.02 |
| 2026-06-03 00:00 |
01:27:17.92 |
+38:54:30.6 |
HIP 6658 |
23.33 |
| 2026-06-03 12:00 |
01:27:22.87 |
+38:55:44.7 |
HIP 6658 |
24.67 |
| 2026-06-04 00:00 |
01:27:27.77 |
+38:56:58.9 |
HIP 6658 |
26.02 |
| 2026-06-04 12:00 |
01:27:32.63 |
+38:58:13.1 |
HIP 6658 |
27.38 |
| 2026-06-05 00:00 |
01:27:37.44 |
+38:59:27.4 |
HIP 6658 |
28.76 |
| 2026-06-05 12:00 |
01:27:42.21 |
+39:00:41.8 |
HIP 6658 |
30.15 |
| 2026-06-06 00:00 |
01:27:46.92 |
+39:01:56.3 |
HIP 6658 |
31.54 |
| 2026-06-06 12:00 |
01:27:51.59 |
+39:03:10.7 |
HIP 6658 |
32.94 |
| 2026-06-07 00:00 |
01:27:56.21 |
+39:04:25.3 |
HIP 6658 |
34.34 |
| 2026-06-07 12:00 |
01:28:00.78 |
+39:05:39.9 |
HIP 6782 |
34.78 |
| 2026-06-08 00:00 |
01:28:05.29 |
+39:06:54.6 |
HIP 6782 |
33.82 |
| 2026-06-08 12:00 |
01:28:09.76 |
+39:08:09.3 |
HIP 6782 |
32.90 |
| 2026-06-09 00:00 |
01:28:14.18 |
+39:09:24.0 |
HIP 6782 |
32.03 |
| 2026-06-09 12:00 |
01:28:18.55 |
+39:10:38.8 |
HIP 6782 |
31.19 |
| 2026-06-10 00:00 |
01:28:22.86 |
+39:11:53.7 |
HIP 6782 |
30.40 |
| 2026-06-10 12:00 |
01:28:27.13 |
+39:13:08.6 |
HIP 6782 |
29.66 |
| 2026-06-11 00:00 |
01:28:31.34 |
+39:14:23.5 |
HIP 6782 |
28.98 |
| 2026-06-11 12:00 |
01:28:35.50 |
+39:15:38.4 |
HIP 6782 |
28.35 |
| 2026-06-12 00:00 |
01:28:39.61 |
+39:16:53.4 |
HIP 6782 |
27.78 |
| 2026-06-12 12:00 |
01:28:43.66 |
+39:18:08.3 |
HIP 6782 |
27.27 |
| 2026-06-13 00:00 |
01:28:47.67 |
+39:19:23.3 |
HIP 6782 |
26.82 |
| 2026-06-13 12:00 |
01:28:51.61 |
+39:20:38.3 |
HIP 6782 |
26.44 |
| 2026-06-14 00:00 |
01:28:55.50 |
+39:21:53.4 |
HIP 7064 |
25.72 |
| 2026-06-14 12:00 |
01:28:59.34 |
+39:23:08.4 |
HIP 7064 |
24.65 |
| 2026-06-15 00:00 |
01:29:03.13 |
+39:24:23.4 |
HIP 7064 |
23.64 |
| 2026-06-15 12:00 |
01:29:06.85 |
+39:25:38.5 |
HIP 7064 |
22.68 |
| 2026-06-16 00:00 |
01:29:10.52 |
+39:26:53.5 |
HIP 7064 |
21.78 |
| 2026-06-16 12:00 |
01:29:14.14 |
+39:28:08.5 |
HIP 7064 |
20.96 |
| 2026-06-17 00:00 |
01:29:17.70 |
+39:29:23.5 |
HIP 7064 |
20.22 |
| 2026-06-17 12:00 |
01:29:21.20 |
+39:30:38.5 |
HIP 7064 |
19.56 |
| 2026-06-18 00:00 |
01:29:24.64 |
+39:31:53.5 |
HIP 7064 |
19.00 |
| 2026-06-18 12:00 |
01:29:28.03 |
+39:33:08.4 |
HIP 7064 |
18.54 |
| 2026-06-19 00:00 |
01:29:31.36 |
+39:34:23.4 |
HIP 7064 |
18.19 |
| 2026-06-19 12:00 |
01:29:34.63 |
+39:35:38.3 |
HIP 7064 |
17.95 |
| 2026-06-20 00:00 |
01:29:37.84 |
+39:36:53.1 |
HIP 7064 |
17.83 |
| 2026-06-20 12:00 |
01:29:41.00 |
+39:38:08.0 |
HIP 7064 |
17.83 |
| 2026-06-21 00:00 |
01:29:44.09 |
+39:39:22.8 |
HIP 7064 |
17.95 |
| 2026-06-21 12:00 |
01:29:47.13 |
+39:40:37.5 |
HIP 7064 |
18.18 |
| 2026-06-22 00:00 |
01:29:50.10 |
+39:41:52.2 |
HIP 7064 |
18.52 |