メタデータ
| 項目 |
値 |
| Designation |
C/2001 Q1 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-09-20T20:53:33.852480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:10Z |
| Obs used |
77 |
| NEO |
- |
| M1 |
11.900 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2001-09-28.0000000 |
| e |
0.96593590 |
| q (au) |
5.833970 |
| a (au) |
171.264460 |
| i (deg) |
66.950479 |
| Ω (om, deg) |
139.261335 |
| ω (w, deg) |
175.461635 |
| M (ma, deg) |
0.003135 |
等級
散乱 + 全体線形
$$
M_a = (8.306 + 3.356\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.306 |
| n |
3.356 |
| gf |
0.883 |
| gb |
-0.935 |
| k |
1.000 |
| δ90 |
4.130 |
| 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) |
| 2026-06-01 00:00 |
07:21:01.18 |
-19:18:17.5 |
HIP 35593 |
6.31 |
| 2026-06-01 12:00 |
07:21:03.65 |
-19:18:01.0 |
HIP 35593 |
6.53 |
| 2026-06-02 00:00 |
07:21:06.13 |
-19:17:44.8 |
HIP 35593 |
6.82 |
| 2026-06-02 12:00 |
07:21:08.62 |
-19:17:28.7 |
HIP 35593 |
7.15 |
| 2026-06-03 00:00 |
07:21:11.13 |
-19:17:12.9 |
HIP 35593 |
7.53 |
| 2026-06-03 12:00 |
07:21:13.65 |
-19:16:57.3 |
HIP 35593 |
7.95 |
| 2026-06-04 00:00 |
07:21:16.18 |
-19:16:41.8 |
HIP 35593 |
8.40 |
| 2026-06-04 12:00 |
07:21:18.73 |
-19:16:26.6 |
HIP 35593 |
8.89 |
| 2026-06-05 00:00 |
07:21:21.30 |
-19:16:11.7 |
HIP 35593 |
9.39 |
| 2026-06-05 12:00 |
07:21:23.87 |
-19:15:56.9 |
HIP 35593 |
9.92 |
| 2026-06-06 00:00 |
07:21:26.46 |
-19:15:42.3 |
HIP 35593 |
10.47 |
| 2026-06-06 12:00 |
07:21:29.06 |
-19:15:28.0 |
HIP 35593 |
11.03 |
| 2026-06-07 00:00 |
07:21:31.68 |
-19:15:13.9 |
HIP 35593 |
11.60 |
| 2026-06-07 12:00 |
07:21:34.31 |
-19:15:00.0 |
HIP 35593 |
12.19 |
| 2026-06-08 00:00 |
07:21:36.95 |
-19:14:46.3 |
HIP 35593 |
12.79 |
| 2026-06-08 12:00 |
07:21:39.60 |
-19:14:32.8 |
HIP 35593 |
13.40 |
| 2026-06-09 00:00 |
07:21:42.26 |
-19:14:19.6 |
HIP 35593 |
14.01 |
| 2026-06-09 12:00 |
07:21:44.94 |
-19:14:06.5 |
HIP 35593 |
14.64 |
| 2026-06-10 00:00 |
07:21:47.63 |
-19:13:53.7 |
HIP 35727 |
14.28 |
| 2026-06-10 12:00 |
07:21:50.33 |
-19:13:41.1 |
HIP 35727 |
13.82 |
| 2026-06-11 00:00 |
07:21:53.04 |
-19:13:28.8 |
HIP 35727 |
13.39 |
| 2026-06-11 12:00 |
07:21:55.77 |
-19:13:16.6 |
HIP 35727 |
12.98 |
| 2026-06-12 00:00 |
07:21:58.50 |
-19:13:04.7 |
HIP 35727 |
12.59 |
| 2026-06-12 12:00 |
07:22:01.25 |
-19:12:53.0 |
HIP 35727 |
12.24 |
| 2026-06-13 00:00 |
07:22:04.00 |
-19:12:41.6 |
HIP 35727 |
11.91 |
| 2026-06-13 12:00 |
07:22:06.77 |
-19:12:30.3 |
HIP 35727 |
11.62 |
| 2026-06-14 00:00 |
07:22:09.55 |
-19:12:19.3 |
HIP 35727 |
11.37 |
| 2026-06-14 12:00 |
07:22:12.34 |
-19:12:08.5 |
HIP 35727 |
11.15 |
| 2026-06-15 00:00 |
07:22:15.13 |
-19:11:58.0 |
HIP 35727 |
10.98 |
| 2026-06-15 12:00 |
07:22:17.94 |
-19:11:47.6 |
HIP 35727 |
10.85 |
| 2026-06-16 00:00 |
07:22:20.76 |
-19:11:37.5 |
HIP 35727 |
10.77 |
| 2026-06-16 12:00 |
07:22:23.59 |
-19:11:27.6 |
HIP 35727 |
10.73 |
| 2026-06-17 00:00 |
07:22:26.42 |
-19:11:18.0 |
HIP 35727 |
10.75 |
| 2026-06-17 12:00 |
07:22:29.27 |
-19:11:08.6 |
HIP 35727 |
10.81 |
| 2026-06-18 00:00 |
07:22:32.12 |
-19:10:59.4 |
HIP 35727 |
10.92 |
| 2026-06-18 12:00 |
07:22:34.99 |
-19:10:50.4 |
HIP 35727 |
11.07 |
| 2026-06-19 00:00 |
07:22:37.86 |
-19:10:41.7 |
HIP 35727 |
11.28 |
| 2026-06-19 12:00 |
07:22:40.74 |
-19:10:33.2 |
HIP 35727 |
11.52 |
| 2026-06-20 00:00 |
07:22:43.63 |
-19:10:25.0 |
HIP 35727 |
11.80 |
| 2026-06-20 12:00 |
07:22:46.52 |
-19:10:16.9 |
HIP 35727 |
12.12 |
| 2026-06-21 00:00 |
07:22:49.43 |
-19:10:09.1 |
HIP 35727 |
12.48 |
| 2026-06-21 12:00 |
07:22:52.34 |
-19:10:01.5 |
HIP 35727 |
12.87 |
| 2026-06-22 00:00 |
07:22:55.26 |
-19:09:54.2 |
HIP 35727 |
13.29 |