메타데이터
| 항목 |
값 |
| Designation |
4P/Faye |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-09-05T16:51:28.051200Z |
| Orbit solution date (soln_date, UTC) |
2026-07-20T21:56:13Z |
| Obs used |
3565 |
| NEO |
- |
| M1 |
11.000 |
| K1 |
9.500 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-02-09.0000000 |
| e |
0.58445627 |
| q (au) |
1.578180 |
| a (au) |
3.797867 |
| i (deg) |
8.159059 |
| Ω (om, deg) |
194.793848 |
| ω (w, deg) |
205.996302 |
| M (ma, deg) |
234.863274 |
밝기
산란 + 전체 선형
$$
M_a = (9.888 + 3.879\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
9.888 |
| n |
3.879 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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 |
| 2021-03-26 |
2021-09-05 |
+0.9434 |
-0.816 |
| 2021-09-06 |
2023-03-25 |
+0.6989 |
-0.717 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
15:10:39.07 |
-11:27:24.9 |
HIP 74311 |
10.23 |
| 2026-07-29 12:00 |
15:10:39.72 |
-11:27:51.2 |
HIP 74311 |
10.04 |
| 2026-07-30 00:00 |
15:10:40.54 |
-11:28:18.3 |
HIP 74311 |
9.83 |
| 2026-07-30 12:00 |
15:10:41.54 |
-11:28:46.1 |
HIP 74311 |
9.60 |
| 2026-07-31 00:00 |
15:10:42.70 |
-11:29:14.5 |
HIP 74311 |
9.35 |
| 2026-07-31 12:00 |
15:10:44.04 |
-11:29:43.7 |
HIP 74311 |
9.09 |
| 2026-08-01 00:00 |
15:10:45.55 |
-11:30:13.6 |
HIP 74311 |
8.82 |
| 2026-08-01 12:00 |
15:10:47.23 |
-11:30:44.2 |
HIP 74311 |
8.55 |
| 2026-08-02 00:00 |
15:10:49.09 |
-11:31:15.4 |
HIP 74311 |
8.29 |
| 2026-08-02 12:00 |
15:10:51.11 |
-11:31:47.4 |
HIP 74311 |
8.04 |
| 2026-08-03 00:00 |
15:10:53.30 |
-11:32:20.0 |
HIP 74311 |
7.83 |
| 2026-08-03 12:00 |
15:10:55.67 |
-11:32:53.4 |
HIP 74311 |
7.66 |
| 2026-08-04 00:00 |
15:10:58.20 |
-11:33:27.4 |
HIP 74311 |
7.55 |
| 2026-08-04 12:00 |
15:11:00.91 |
-11:34:02.0 |
HIP 74311 |
7.51 |
| 2026-08-05 00:00 |
15:11:03.78 |
-11:34:37.4 |
HIP 74311 |
7.57 |
| 2026-08-05 12:00 |
15:11:06.82 |
-11:35:13.4 |
HIP 74311 |
7.72 |
| 2026-08-06 00:00 |
15:11:10.03 |
-11:35:50.1 |
HIP 74311 |
7.99 |
| 2026-08-06 12:00 |
15:11:13.41 |
-11:36:27.4 |
HIP 74311 |
8.36 |
| 2026-08-07 00:00 |
15:11:16.96 |
-11:37:05.4 |
HIP 74311 |
8.85 |
| 2026-08-07 12:00 |
15:11:20.68 |
-11:37:44.0 |
HIP 74311 |
9.45 |
| 2026-08-08 00:00 |
15:11:24.56 |
-11:38:23.3 |
HIP 74311 |
10.15 |
| 2026-08-08 12:00 |
15:11:28.61 |
-11:39:03.2 |
HIP 74311 |
10.94 |
| 2026-08-09 00:00 |
15:11:32.83 |
-11:39:43.7 |
HIP 74311 |
11.82 |
| 2026-08-09 12:00 |
15:11:37.21 |
-11:40:24.9 |
HIP 74311 |
12.79 |
| 2026-08-10 00:00 |
15:11:41.76 |
-11:41:06.7 |
HIP 74311 |
13.83 |
| 2026-08-10 12:00 |
15:11:46.48 |
-11:41:49.2 |
HIP 74311 |
14.94 |
| 2026-08-11 00:00 |
15:11:51.36 |
-11:42:32.2 |
HIP 74311 |
16.11 |
| 2026-08-11 12:00 |
15:11:56.40 |
-11:43:15.9 |
HIP 74311 |
17.35 |
| 2026-08-12 00:00 |
15:12:01.61 |
-11:44:00.2 |
HIP 74311 |
18.64 |
| 2026-08-12 12:00 |
15:12:06.99 |
-11:44:45.1 |
HIP 74311 |
19.99 |
| 2026-08-13 00:00 |
15:12:12.53 |
-11:45:30.5 |
HIP 74311 |
21.40 |
| 2026-08-13 12:00 |
15:12:18.23 |
-11:46:16.6 |
HIP 74311 |
22.85 |
| 2026-08-14 00:00 |
15:12:24.09 |
-11:47:03.2 |
HIP 74311 |
24.36 |
| 2026-08-14 12:00 |
15:12:30.12 |
-11:47:50.5 |
HIP 74311 |
25.92 |
| 2026-08-15 00:00 |
15:12:36.30 |
-11:48:38.3 |
HIP 74311 |
27.52 |
| 2026-08-15 12:00 |
15:12:42.65 |
-11:49:26.7 |
HIP 74311 |
29.17 |
| 2026-08-16 00:00 |
15:12:49.16 |
-11:50:15.6 |
HIP 74311 |
30.86 |
| 2026-08-16 12:00 |
15:12:55.82 |
-11:51:05.1 |
HIP 74430 |
32.35 |
| 2026-08-17 00:00 |
15:13:02.65 |
-11:51:55.1 |
HIP 74430 |
31.76 |
| 2026-08-17 12:00 |
15:13:09.63 |
-11:52:45.7 |
HIP 74430 |
31.27 |
| 2026-08-18 00:00 |
15:13:16.77 |
-11:53:36.9 |
HIP 74533 |
30.13 |
| 2026-08-18 12:00 |
15:13:24.07 |
-11:54:28.5 |
HIP 74533 |
28.90 |
| 2026-08-19 00:00 |
15:13:31.52 |
-11:55:20.7 |
HIP 74533 |
27.73 |