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 · University of Arizona 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
$$
M_a = (0.678 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
0.678 |
| n |
6.000 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 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 |
| 2026-06-02 12:00 |
01:41:40.28 |
-15:12:37.4 |
HIP 7891 |
2.43 |
| 2026-06-03 00:00 |
01:41:51.02 |
-15:13:36.1 |
HIP 7891 |
4.70 |
| 2026-06-03 12:00 |
01:42:01.70 |
-15:14:35.7 |
HIP 7891 |
7.31 |
| 2026-06-04 00:00 |
01:42:12.33 |
-15:15:36.0 |
HIP 7891 |
9.99 |
| 2026-06-04 12:00 |
01:42:22.91 |
-15:16:37.0 |
HIP 7891 |
12.69 |
| 2026-06-05 00:00 |
01:42:33.43 |
-15:17:38.9 |
HIP 7891 |
15.40 |
| 2026-06-05 12:00 |
01:42:43.90 |
-15:18:41.5 |
HIP 7891 |
18.10 |
| 2026-06-06 00:00 |
01:42:54.32 |
-15:19:44.9 |
HIP 7891 |
20.81 |
| 2026-06-06 12:00 |
01:43:04.67 |
-15:20:49.0 |
HIP 7891 |
23.51 |
| 2026-06-07 00:00 |
01:43:14.98 |
-15:21:54.0 |
HIP 7891 |
26.20 |
| 2026-06-07 12:00 |
01:43:25.22 |
-15:22:59.7 |
HIP 7891 |
28.89 |
| 2026-06-08 00:00 |
01:43:35.41 |
-15:24:06.1 |
HIP 8208 |
31.50 |
| 2026-06-08 12:00 |
01:43:45.54 |
-15:25:13.4 |
HIP 8208 |
29.83 |
| 2026-06-09 00:00 |
01:43:55.62 |
-15:26:21.5 |
HIP 8208 |
28.34 |
| 2026-06-09 12:00 |
01:44:05.63 |
-15:27:30.3 |
HIP 8208 |
27.05 |
| 2026-06-10 00:00 |
01:44:15.59 |
-15:28:39.9 |
HIP 8208 |
25.99 |
| 2026-06-10 12:00 |
01:44:25.48 |
-15:29:50.3 |
HIP 8208 |
25.19 |
| 2026-06-11 00:00 |
01:44:35.32 |
-15:31:01.5 |
HIP 8208 |
24.67 |
| 2026-06-11 12:00 |
01:44:45.10 |
-15:32:13.4 |
HIP 8188 |
22.76 |
| 2026-06-12 00:00 |
01:44:54.81 |
-15:33:26.2 |
HIP 8188 |
20.92 |
| 2026-06-12 12:00 |
01:45:04.47 |
-15:34:39.7 |
HIP 8188 |
19.26 |
| 2026-06-13 00:00 |
01:45:14.06 |
-15:35:54.0 |
HIP 8188 |
17.82 |
| 2026-06-13 12:00 |
01:45:23.59 |
-15:37:09.1 |
HIP 8188 |
16.66 |
| 2026-06-14 00:00 |
01:45:33.05 |
-15:38:25.0 |
HIP 8188 |
15.83 |
| 2026-06-14 12:00 |
01:45:42.45 |
-15:39:41.7 |
HIP 8188 |
15.38 |
| 2026-06-15 00:00 |
01:45:51.79 |
-15:40:59.2 |
HIP 8188 |
15.34 |
| 2026-06-15 12:00 |
01:46:01.06 |
-15:42:17.4 |
HIP 8188 |
15.72 |
| 2026-06-16 00:00 |
01:46:10.27 |
-15:43:36.5 |
HIP 8188 |
16.47 |
| 2026-06-16 12:00 |
01:46:19.41 |
-15:44:56.3 |
HIP 8188 |
17.56 |
| 2026-06-17 00:00 |
01:46:28.49 |
-15:46:16.9 |
HIP 8188 |
18.91 |
| 2026-06-17 12:00 |
01:46:37.50 |
-15:47:38.3 |
HIP 8188 |
20.48 |
| 2026-06-18 00:00 |
01:46:46.44 |
-15:49:00.5 |
HIP 8188 |
22.21 |
| 2026-06-18 12:00 |
01:46:55.32 |
-15:50:23.5 |
HIP 8188 |
24.07 |
| 2026-06-19 00:00 |
01:47:04.13 |
-15:51:47.2 |
HIP 8188 |
26.02 |
| 2026-06-19 12:00 |
01:47:12.86 |
-15:53:11.8 |
HIP 8265 |
27.28 |
| 2026-06-20 00:00 |
01:47:21.53 |
-15:54:37.1 |
HIP 8265 |
26.91 |
| 2026-06-20 12:00 |
01:47:30.14 |
-15:56:03.2 |
HIP 8265 |
26.77 |
| 2026-06-21 00:00 |
01:47:38.67 |
-15:57:30.1 |
HIP 8265 |
26.83 |
| 2026-06-21 12:00 |
01:47:47.13 |
-15:58:57.7 |
HIP 8265 |
27.11 |
| 2026-06-22 00:00 |
01:47:55.52 |
-16:00:26.1 |
HIP 8265 |
27.59 |