메타데이터
| 항목 |
값 |
| Designation |
C/2015 F4 (Jacques) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-08-10T20:42:31.959360Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:44:08Z |
| Obs used |
2837 |
| NEO |
- |
| M1 |
11.300 |
| K1 |
9.500 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2015-08-22.0000000 |
| e |
0.98587145 |
| q (au) |
1.643925 |
| a (au) |
116.354874 |
| i (deg) |
48.704931 |
| Ω (om, deg) |
285.958058 |
| ω (w, deg) |
36.346505 |
| M (ma, deg) |
0.008746 |
밝기
산란 + 전체 선형
$$
M_a = (13.073 + 3.298\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
13.073 |
| n |
3.298 |
| gf |
1.000 |
| gb |
-0.617 |
| 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 |
| 2015-03-27 |
2015-08-10 |
-1.7959 |
+0.136 |
| 2015-08-10 |
2015-10-17 |
+11.1365 |
-2.891 |
| 2015-10-17 |
2016-11-06 |
-3.6108 |
+1.480 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
07:19:16.39 |
+15:54:34.0 |
HIP 35551 |
18.85 |
| 2026-03-26 12:00 |
07:19:15.44 |
+15:54:39.5 |
HIP 35551 |
18.94 |
| 2026-03-27 00:00 |
07:19:14.54 |
+15:54:45.0 |
HIP 35551 |
19.02 |
| 2026-03-27 12:00 |
07:19:13.68 |
+15:54:50.4 |
HIP 35551 |
19.10 |
| 2026-03-28 00:00 |
07:19:12.87 |
+15:54:55.7 |
HIP 35551 |
19.18 |
| 2026-03-28 12:00 |
07:19:12.09 |
+15:55:01.0 |
HIP 35551 |
19.25 |
| 2026-03-29 00:00 |
07:19:11.36 |
+15:55:06.2 |
HIP 35551 |
19.31 |
| 2026-03-29 12:00 |
07:19:10.67 |
+15:55:11.3 |
HIP 35551 |
19.38 |
| 2026-03-30 00:00 |
07:19:10.02 |
+15:55:16.3 |
HIP 35551 |
19.43 |
| 2026-03-30 12:00 |
07:19:09.42 |
+15:55:21.3 |
HIP 35551 |
19.49 |
| 2026-03-31 00:00 |
07:19:08.86 |
+15:55:26.2 |
HIP 35551 |
19.53 |
| 2026-03-31 12:00 |
07:19:08.33 |
+15:55:31.0 |
HIP 35551 |
19.57 |
| 2026-04-01 00:00 |
07:19:07.86 |
+15:55:35.7 |
HIP 35551 |
19.61 |
| 2026-04-01 12:00 |
07:19:07.42 |
+15:55:40.4 |
HIP 35551 |
19.64 |
| 2026-04-02 00:00 |
07:19:07.02 |
+15:55:45.0 |
HIP 35551 |
19.66 |
| 2026-04-02 12:00 |
07:19:06.67 |
+15:55:49.5 |
HIP 35551 |
19.68 |
| 2026-04-03 00:00 |
07:19:06.36 |
+15:55:53.9 |
HIP 35551 |
19.69 |
| 2026-04-03 12:00 |
07:19:06.09 |
+15:55:58.2 |
HIP 35551 |
19.69 |
| 2026-04-04 00:00 |
07:19:05.86 |
+15:56:02.5 |
HIP 35551 |
19.69 |
| 2026-04-04 12:00 |
07:19:05.68 |
+15:56:06.7 |
HIP 35551 |
19.68 |
| 2026-04-05 00:00 |
07:19:05.54 |
+15:56:10.8 |
HIP 35551 |
19.66 |
| 2026-04-05 12:00 |
07:19:05.44 |
+15:56:14.8 |
HIP 35551 |
19.64 |
| 2026-04-06 00:00 |
07:19:05.38 |
+15:56:18.8 |
HIP 35551 |
19.61 |
| 2026-04-06 12:00 |
07:19:05.36 |
+15:56:22.6 |
HIP 35551 |
19.57 |
| 2026-04-07 00:00 |
07:19:05.38 |
+15:56:26.4 |
HIP 35551 |
19.53 |
| 2026-04-07 12:00 |
07:19:05.45 |
+15:56:30.1 |
HIP 35551 |
19.48 |
| 2026-04-08 00:00 |
07:19:05.56 |
+15:56:33.7 |
HIP 35551 |
19.42 |
| 2026-04-08 12:00 |
07:19:05.71 |
+15:56:37.3 |
HIP 35551 |
19.36 |
| 2026-04-09 00:00 |
07:19:05.90 |
+15:56:40.7 |
HIP 35551 |
19.29 |
| 2026-04-09 12:00 |
07:19:06.13 |
+15:56:44.1 |
HIP 35551 |
19.21 |
| 2026-04-10 00:00 |
07:19:06.40 |
+15:56:47.4 |
HIP 35551 |
19.12 |
| 2026-04-10 12:00 |
07:19:06.72 |
+15:56:50.6 |
HIP 35551 |
19.03 |
| 2026-04-11 00:00 |
07:19:07.07 |
+15:56:53.7 |
HIP 35551 |
18.93 |
| 2026-04-11 12:00 |
07:19:07.47 |
+15:56:56.7 |
HIP 35551 |
18.82 |
| 2026-04-12 00:00 |
07:19:07.91 |
+15:56:59.7 |
HIP 35551 |
18.71 |
| 2026-04-12 12:00 |
07:19:08.39 |
+15:57:02.5 |
HIP 35551 |
18.59 |
| 2026-04-13 00:00 |
07:19:08.91 |
+15:57:05.3 |
HIP 35551 |
18.46 |
| 2026-04-13 12:00 |
07:19:09.48 |
+15:57:08.0 |
HIP 35551 |
18.33 |
| 2026-04-14 00:00 |
07:19:10.08 |
+15:57:10.5 |
HIP 35551 |
18.19 |
| 2026-04-14 12:00 |
07:19:10.72 |
+15:57:13.0 |
HIP 35551 |
18.04 |
| 2026-04-15 00:00 |
07:19:11.41 |
+15:57:15.4 |
HIP 35551 |
17.89 |
| 2026-04-15 12:00 |
07:19:12.14 |
+15:57:17.8 |
HIP 35551 |
17.73 |
| 2026-04-16 00:00 |
07:19:12.90 |
+15:57:20.0 |
HIP 35551 |
17.56 |