メタデータ
| 項目 |
値 |
| 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 |
オスキュレーティング軌道要素
| 項目 |
値 |
| 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 |
等級
散乱 + 全体線形
$$
M_a = (0.678 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
0.678 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
01:54:35.40 |
-18:23:00.9 |
HIP 8864 |
19.62 |
| 2026-07-29 12:00 |
01:54:37.50 |
-18:25:20.5 |
HIP 8864 |
21.96 |
| 2026-07-30 00:00 |
01:54:39.51 |
-18:27:40.6 |
HIP 8864 |
24.30 |
| 2026-07-30 12:00 |
01:54:41.43 |
-18:30:01.2 |
HIP 9025 |
23.19 |
| 2026-07-31 00:00 |
01:54:43.25 |
-18:32:22.3 |
HIP 9025 |
22.16 |
| 2026-07-31 12:00 |
01:54:44.97 |
-18:34:44.0 |
HIP 9025 |
21.38 |
| 2026-08-01 00:00 |
01:54:46.61 |
-18:37:06.1 |
HIP 9025 |
20.86 |
| 2026-08-01 12:00 |
01:54:48.15 |
-18:39:28.7 |
HIP 9025 |
20.64 |
| 2026-08-02 00:00 |
01:54:49.59 |
-18:41:51.7 |
HIP 9025 |
20.72 |
| 2026-08-02 12:00 |
01:54:50.94 |
-18:44:15.3 |
HIP 9025 |
21.10 |
| 2026-08-03 00:00 |
01:54:52.20 |
-18:46:39.3 |
HIP 9025 |
21.76 |
| 2026-08-03 12:00 |
01:54:53.35 |
-18:49:03.7 |
HIP 9025 |
22.69 |
| 2026-08-04 00:00 |
01:54:54.42 |
-18:51:28.7 |
HIP 9025 |
23.85 |
| 2026-08-04 12:00 |
01:54:55.39 |
-18:53:54.0 |
HIP 8956 |
23.33 |
| 2026-08-05 00:00 |
01:54:56.26 |
-18:56:19.8 |
HIP 8956 |
20.93 |
| 2026-08-05 12:00 |
01:54:57.04 |
-18:58:46.1 |
HIP 8956 |
18.54 |
| 2026-08-06 00:00 |
01:54:57.72 |
-19:01:12.7 |
HIP 8956 |
16.16 |
| 2026-08-06 12:00 |
01:54:58.31 |
-19:03:39.8 |
HIP 8956 |
13.81 |
| 2026-08-07 00:00 |
01:54:58.80 |
-19:06:07.3 |
HIP 8956 |
11.51 |
| 2026-08-07 12:00 |
01:54:59.19 |
-19:08:35.2 |
HIP 8956 |
9.29 |
| 2026-08-08 00:00 |
01:54:59.49 |
-19:11:03.5 |
HIP 8956 |
7.25 |
| 2026-08-08 12:00 |
01:54:59.69 |
-19:13:32.2 |
HIP 8956 |
5.58 |
| 2026-08-09 00:00 |
01:54:59.80 |
-19:16:01.2 |
HIP 8956 |
4.72 |
| 2026-08-09 12:00 |
01:54:59.80 |
-19:18:30.7 |
HIP 8956 |
5.10 |
| 2026-08-10 00:00 |
01:54:59.72 |
-19:21:00.5 |
HIP 8956 |
6.51 |
| 2026-08-10 12:00 |
01:54:59.53 |
-19:23:30.6 |
HIP 8956 |
8.46 |
| 2026-08-11 00:00 |
01:54:59.25 |
-19:26:01.1 |
HIP 8956 |
10.65 |
| 2026-08-11 12:00 |
01:54:58.87 |
-19:28:31.9 |
HIP 8956 |
12.98 |
| 2026-08-12 00:00 |
01:54:58.40 |
-19:31:03.1 |
HIP 8956 |
15.38 |
| 2026-08-12 12:00 |
01:54:57.83 |
-19:33:34.5 |
HIP 8956 |
17.82 |
| 2026-08-13 00:00 |
01:54:57.16 |
-19:36:06.3 |
HIP 8956 |
20.29 |
| 2026-08-13 12:00 |
01:54:56.40 |
-19:38:38.4 |
HIP 8956 |
22.79 |
| 2026-08-14 00:00 |
01:54:55.54 |
-19:41:10.7 |
HIP 8956 |
25.31 |
| 2026-08-14 12:00 |
01:54:54.59 |
-19:43:43.4 |
HIP 8956 |
27.84 |
| 2026-08-15 00:00 |
01:54:53.54 |
-19:46:16.3 |
HIP 8956 |
30.39 |
| 2026-08-15 12:00 |
01:54:52.39 |
-19:48:49.4 |
HIP 8956 |
32.94 |
| 2026-08-16 00:00 |
01:54:51.15 |
-19:51:22.9 |
HIP 8770 |
35.30 |
| 2026-08-16 12:00 |
01:54:49.81 |
-19:53:56.5 |
HIP 8770 |
36.64 |
| 2026-08-17 00:00 |
01:54:48.38 |
-19:56:30.4 |
HIP 8770 |
38.09 |
| 2026-08-17 12:00 |
01:54:46.85 |
-19:59:04.5 |
HIP 8988 |
37.64 |
| 2026-08-18 00:00 |
01:54:45.23 |
-20:01:38.8 |
HIP 8988 |
35.44 |
| 2026-08-18 12:00 |
01:54:43.51 |
-20:04:13.4 |
HIP 8988 |
33.31 |
| 2026-08-19 00:00 |
01:54:41.70 |
-20:06:48.1 |
HIP 8988 |
31.25 |