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) |
| 2026-09-20 00:00 |
01:49:44.87 |
-22:50:40.8 |
HIP 8554 |
9.61 |
| 2026-09-20 12:00 |
01:49:37.76 |
-22:53:05.6 |
HIP 8554 |
12.28 |
| 2026-09-21 00:00 |
01:49:30.59 |
-22:55:29.8 |
HIP 8554 |
15.05 |
| 2026-09-21 12:00 |
01:49:23.36 |
-22:57:53.5 |
HIP 8554 |
17.86 |
| 2026-09-22 00:00 |
01:49:16.07 |
-23:00:16.6 |
HIP 8554 |
20.71 |
| 2026-09-22 12:00 |
01:49:08.73 |
-23:02:39.2 |
HIP 8554 |
23.58 |
| 2026-09-23 00:00 |
01:49:01.33 |
-23:05:01.2 |
HIP 8340 |
25.54 |
| 2026-09-23 12:00 |
01:48:53.87 |
-23:07:22.7 |
HIP 8340 |
25.79 |
| 2026-09-24 00:00 |
01:48:46.35 |
-23:09:43.6 |
HIP 8340 |
26.35 |
| 2026-09-24 12:00 |
01:48:38.79 |
-23:12:03.9 |
HIP 8340 |
27.19 |
| 2026-09-25 00:00 |
01:48:31.17 |
-23:14:23.5 |
HIP 8340 |
28.30 |
| 2026-09-25 12:00 |
01:48:23.49 |
-23:16:42.6 |
HIP 8340 |
29.64 |
| 2026-09-26 00:00 |
01:48:15.77 |
-23:19:01.1 |
HIP 8340 |
31.18 |
| 2026-09-26 12:00 |
01:48:07.99 |
-23:21:18.9 |
HIP 8434 |
31.90 |
| 2026-09-27 00:00 |
01:48:00.17 |
-23:23:36.1 |
HIP 8434 |
30.22 |
| 2026-09-27 12:00 |
01:47:52.29 |
-23:25:52.6 |
HIP 8434 |
28.76 |
| 2026-09-28 00:00 |
01:47:44.37 |
-23:28:08.5 |
HIP 8434 |
27.54 |
| 2026-09-28 12:00 |
01:47:36.40 |
-23:30:23.7 |
HIP 8434 |
26.59 |
| 2026-09-29 00:00 |
01:47:28.38 |
-23:32:38.3 |
HIP 8434 |
25.96 |
| 2026-09-29 12:00 |
01:47:20.32 |
-23:34:52.1 |
HIP 8434 |
25.65 |
| 2026-09-30 00:00 |
01:47:12.21 |
-23:37:05.3 |
HIP 8281 |
24.78 |
| 2026-09-30 12:00 |
01:47:04.07 |
-23:39:17.7 |
HIP 8281 |
22.16 |
| 2026-10-01 00:00 |
01:46:55.87 |
-23:41:29.5 |
HIP 8281 |
19.64 |
| 2026-10-01 12:00 |
01:46:47.64 |
-23:43:40.5 |
HIP 8281 |
17.23 |
| 2026-10-02 00:00 |
01:46:39.37 |
-23:45:50.7 |
HIP 8281 |
15.02 |
| 2026-10-02 12:00 |
01:46:31.05 |
-23:48:00.3 |
HIP 8281 |
13.07 |
| 2026-10-03 00:00 |
01:46:22.70 |
-23:50:09.0 |
HIP 8281 |
11.54 |
| 2026-10-03 12:00 |
01:46:14.31 |
-23:52:17.1 |
HIP 8281 |
10.59 |
| 2026-10-04 00:00 |
01:46:05.88 |
-23:54:24.3 |
HIP 8281 |
10.39 |
| 2026-10-04 12:00 |
01:45:57.42 |
-23:56:30.8 |
HIP 8281 |
10.97 |
| 2026-10-05 00:00 |
01:45:48.93 |
-23:58:36.4 |
HIP 8281 |
12.23 |
| 2026-10-05 12:00 |
01:45:40.40 |
-24:00:41.3 |
HIP 8281 |
13.97 |
| 2026-10-06 00:00 |
01:45:31.83 |
-24:02:45.4 |
HIP 8281 |
16.03 |
| 2026-10-06 12:00 |
01:45:23.24 |
-24:04:48.6 |
HIP 8281 |
18.31 |
| 2026-10-07 00:00 |
01:45:14.62 |
-24:06:51.0 |
HIP 8107 |
18.09 |
| 2026-10-07 12:00 |
01:45:05.96 |
-24:08:52.6 |
HIP 8107 |
15.29 |
| 2026-10-08 00:00 |
01:44:57.28 |
-24:10:53.3 |
HIP 8107 |
12.51 |
| 2026-10-08 12:00 |
01:44:48.57 |
-24:12:53.2 |
HIP 8107 |
9.76 |
| 2026-10-09 00:00 |
01:44:39.84 |
-24:14:52.2 |
HIP 8107 |
7.06 |
| 2026-10-09 12:00 |
01:44:31.08 |
-24:16:50.3 |
HIP 8107 |
4.49 |
| 2026-10-10 00:00 |
01:44:22.30 |
-24:18:47.6 |
HIP 8107 |
2.49 |
| 2026-10-10 12:00 |
01:44:13.50 |
-24:20:43.9 |
HIP 8107 |
2.79 |
| 2026-10-11 00:00 |
01:44:04.68 |
-24:22:39.4 |
HIP 8107 |
4.98 |