메타데이터
| 항목 |
값 |
| Designation |
C/2021 Q4 (Fuls) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-06-10T10:47:21.906240Z |
| Orbit solution date (soln_date, UTC) |
2025-10-03T14:42:16Z |
| Obs used |
558 |
| NEO |
- |
| M1 |
6.800 |
| K1 |
9.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-08-26T07:09:57.139200Z |
| Discovery magnitude (MPC) |
20.07 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2023-04-14.0000000 |
| e |
1.00316029 |
| q (au) |
7.564703 |
| a (au) |
-2393.669779 |
| i (deg) |
71.474447 |
| Ω (om, deg) |
183.332460 |
| ω (w, deg) |
146.998903 |
| M (ma, deg) |
-0.000483 |
밝기
산란 + 전체 선형
$$
M_a = (0.695 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
0.695 |
| n |
6.000 |
| gf |
0.998 |
| gb |
-1.000 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
01:33:14.99 |
-14:42:17.9 |
HIP 7152 |
19.74 |
| 2026-05-12 12:00 |
01:33:27.57 |
-14:42:44.9 |
HIP 7152 |
22.41 |
| 2026-05-13 00:00 |
01:33:40.11 |
-14:43:12.7 |
HIP 7152 |
25.18 |
| 2026-05-13 12:00 |
01:33:52.62 |
-14:43:41.2 |
HIP 7379 |
26.26 |
| 2026-05-14 00:00 |
01:34:05.10 |
-14:44:10.3 |
HIP 7379 |
24.72 |
| 2026-05-14 12:00 |
01:34:17.54 |
-14:44:40.2 |
HIP 7379 |
23.49 |
| 2026-05-15 00:00 |
01:34:29.95 |
-14:45:10.8 |
HIP 7379 |
22.62 |
| 2026-05-15 12:00 |
01:34:42.33 |
-14:45:42.1 |
HIP 7379 |
22.15 |
| 2026-05-16 00:00 |
01:34:54.67 |
-14:46:14.1 |
HIP 7379 |
22.11 |
| 2026-05-16 12:00 |
01:35:06.97 |
-14:46:46.8 |
HIP 7379 |
22.49 |
| 2026-05-17 00:00 |
01:35:19.24 |
-14:47:20.3 |
HIP 7379 |
23.27 |
| 2026-05-17 12:00 |
01:35:31.47 |
-14:47:54.4 |
HIP 7379 |
24.42 |
| 2026-05-18 00:00 |
01:35:43.66 |
-14:48:29.3 |
HIP 7379 |
25.87 |
| 2026-05-18 12:00 |
01:35:55.81 |
-14:49:04.9 |
HIP 7379 |
27.59 |
| 2026-05-19 00:00 |
01:36:07.93 |
-14:49:41.2 |
HIP 7595 |
25.68 |
| 2026-05-19 12:00 |
01:36:20.01 |
-14:50:18.3 |
HIP 7595 |
22.70 |
| 2026-05-20 00:00 |
01:36:32.04 |
-14:50:56.1 |
HIP 7595 |
19.73 |
| 2026-05-20 12:00 |
01:36:44.04 |
-14:51:34.6 |
HIP 7595 |
16.77 |
| 2026-05-21 00:00 |
01:36:55.99 |
-14:52:13.9 |
HIP 7595 |
13.82 |
| 2026-05-21 12:00 |
01:37:07.90 |
-14:52:53.9 |
HIP 7595 |
10.87 |
| 2026-05-22 00:00 |
01:37:19.78 |
-14:53:34.6 |
HIP 7595 |
7.94 |
| 2026-05-22 12:00 |
01:37:31.61 |
-14:54:16.1 |
HIP 7595 |
5.04 |
| 2026-05-23 00:00 |
01:37:43.39 |
-14:54:58.3 |
HIP 7595 |
2.22 |
| 2026-05-23 12:00 |
01:37:55.14 |
-14:55:41.2 |
HIP 7595 |
1.28 |
| 2026-05-24 00:00 |
01:38:06.84 |
-14:56:24.9 |
HIP 7595 |
3.93 |
| 2026-05-24 12:00 |
01:38:18.49 |
-14:57:09.4 |
HIP 7595 |
6.79 |
| 2026-05-25 00:00 |
01:38:30.10 |
-14:57:54.5 |
HIP 7595 |
9.67 |
| 2026-05-25 12:00 |
01:38:41.67 |
-14:58:40.4 |
HIP 7595 |
12.56 |
| 2026-05-26 00:00 |
01:38:53.19 |
-14:59:27.1 |
HIP 7595 |
15.44 |
| 2026-05-26 12:00 |
01:39:04.67 |
-15:00:14.5 |
HIP 7595 |
18.31 |
| 2026-05-27 00:00 |
01:39:16.10 |
-15:01:02.7 |
HIP 7595 |
21.18 |
| 2026-05-27 12:00 |
01:39:27.48 |
-15:01:51.6 |
HIP 7835 |
21.30 |
| 2026-05-28 00:00 |
01:39:38.82 |
-15:02:41.2 |
HIP 7835 |
19.20 |
| 2026-05-28 12:00 |
01:39:50.10 |
-15:03:31.7 |
HIP 7835 |
17.32 |
| 2026-05-29 00:00 |
01:40:01.34 |
-15:04:22.8 |
HIP 7835 |
15.76 |
| 2026-05-29 12:00 |
01:40:12.54 |
-15:05:14.7 |
HIP 7835 |
14.61 |
| 2026-05-30 00:00 |
01:40:23.68 |
-15:06:07.4 |
HIP 7835 |
13.97 |
| 2026-05-30 12:00 |
01:40:34.77 |
-15:07:00.8 |
HIP 7835 |
13.90 |
| 2026-05-31 00:00 |
01:40:45.82 |
-15:07:55.0 |
HIP 7891 |
12.53 |
| 2026-05-31 12:00 |
01:40:56.81 |
-15:08:50.0 |
HIP 7891 |
9.77 |
| 2026-06-01 00:00 |
01:41:07.75 |
-15:09:45.7 |
HIP 7891 |
7.05 |
| 2026-06-01 12:00 |
01:41:18.65 |
-15:10:42.2 |
HIP 7891 |
4.43 |
| 2026-06-02 00:00 |
01:41:29.49 |
-15:11:39.4 |
HIP 7891 |
2.25 |