メタデータ
| 項目 |
値 |
| Designation |
C/2017 D3 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-04-26T17:48:37.664640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:30Z |
| Obs used |
523 |
| NEO |
- |
| M1 |
11.100 |
| 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) |
2017-10-06.0000000 |
| e |
1.00243639 |
| q (au) |
4.971286 |
| a (au) |
-2040.429612 |
| i (deg) |
125.570039 |
| Ω (om, deg) |
186.618173 |
| ω (w, deg) |
340.767499 |
| M (ma, deg) |
0.001735 |
等級
散乱 + 全体線形
$$
M_a = (10.067 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.067 |
| n |
2.000 |
| gf |
0.997 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.997 |
| 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 |
04:19:57.75 |
+75:22:30.7 |
HIP 20584 |
18.10 |
| 2026-09-20 12:00 |
04:19:46.79 |
+75:23:24.3 |
HIP 20584 |
18.52 |
| 2026-09-21 00:00 |
04:19:35.63 |
+75:24:17.6 |
HIP 20584 |
19.00 |
| 2026-09-21 12:00 |
04:19:24.27 |
+75:25:10.6 |
HIP 20584 |
19.55 |
| 2026-09-22 00:00 |
04:19:12.72 |
+75:26:03.3 |
HIP 20584 |
20.16 |
| 2026-09-22 12:00 |
04:19:00.96 |
+75:26:55.7 |
HIP 20584 |
20.82 |
| 2026-09-23 00:00 |
04:18:49.01 |
+75:27:47.8 |
HIP 20584 |
21.54 |
| 2026-09-23 12:00 |
04:18:36.85 |
+75:28:39.6 |
HIP 20584 |
22.31 |
| 2026-09-24 00:00 |
04:18:24.50 |
+75:29:31.0 |
HIP 19844 |
22.94 |
| 2026-09-24 12:00 |
04:18:11.95 |
+75:30:22.1 |
HIP 19844 |
21.81 |
| 2026-09-25 00:00 |
04:17:59.20 |
+75:31:12.9 |
HIP 19844 |
20.68 |
| 2026-09-25 12:00 |
04:17:46.26 |
+75:32:03.3 |
HIP 19844 |
19.55 |
| 2026-09-26 00:00 |
04:17:33.12 |
+75:32:53.4 |
HIP 19844 |
18.43 |
| 2026-09-26 12:00 |
04:17:19.78 |
+75:33:43.1 |
HIP 19844 |
17.32 |
| 2026-09-27 00:00 |
04:17:06.24 |
+75:34:32.5 |
HIP 19844 |
16.21 |
| 2026-09-27 12:00 |
04:16:52.50 |
+75:35:21.4 |
HIP 19844 |
15.11 |
| 2026-09-28 00:00 |
04:16:38.57 |
+75:36:10.1 |
HIP 19844 |
14.03 |
| 2026-09-28 12:00 |
04:16:24.45 |
+75:36:58.3 |
HIP 19844 |
12.98 |
| 2026-09-29 00:00 |
04:16:10.13 |
+75:37:46.1 |
HIP 19844 |
11.94 |
| 2026-09-29 12:00 |
04:15:55.61 |
+75:38:33.6 |
HIP 19844 |
10.95 |
| 2026-09-30 00:00 |
04:15:40.90 |
+75:39:20.7 |
HIP 19844 |
10.00 |
| 2026-09-30 12:00 |
04:15:25.99 |
+75:40:07.3 |
HIP 19844 |
9.12 |
| 2026-10-01 00:00 |
04:15:10.89 |
+75:40:53.6 |
HIP 19844 |
8.32 |
| 2026-10-01 12:00 |
04:14:55.60 |
+75:41:39.4 |
HIP 19844 |
7.65 |
| 2026-10-02 00:00 |
04:14:40.11 |
+75:42:24.8 |
HIP 19844 |
7.12 |
| 2026-10-02 12:00 |
04:14:24.44 |
+75:43:09.7 |
HIP 19844 |
6.79 |
| 2026-10-03 00:00 |
04:14:08.56 |
+75:43:54.3 |
HIP 19844 |
6.68 |
| 2026-10-03 12:00 |
04:13:52.50 |
+75:44:38.4 |
HIP 19844 |
6.81 |
| 2026-10-04 00:00 |
04:13:36.25 |
+75:45:22.0 |
HIP 19844 |
7.16 |
| 2026-10-04 12:00 |
04:13:19.81 |
+75:46:05.2 |
HIP 19844 |
7.71 |
| 2026-10-05 00:00 |
04:13:03.18 |
+75:46:47.9 |
HIP 19844 |
8.42 |
| 2026-10-05 12:00 |
04:12:46.36 |
+75:47:30.1 |
HIP 19844 |
9.25 |
| 2026-10-06 00:00 |
04:12:29.35 |
+75:48:11.9 |
HIP 19844 |
10.18 |
| 2026-10-06 12:00 |
04:12:12.16 |
+75:48:53.2 |
HIP 19844 |
11.18 |
| 2026-10-07 00:00 |
04:11:54.78 |
+75:49:33.9 |
HIP 19844 |
12.24 |
| 2026-10-07 12:00 |
04:11:37.21 |
+75:50:14.2 |
HIP 19844 |
13.35 |
| 2026-10-08 00:00 |
04:11:19.46 |
+75:50:54.0 |
HIP 19844 |
14.49 |
| 2026-10-08 12:00 |
04:11:01.53 |
+75:51:33.3 |
HIP 19844 |
15.66 |
| 2026-10-09 00:00 |
04:10:43.42 |
+75:52:12.0 |
HIP 19844 |
16.85 |
| 2026-10-09 12:00 |
04:10:25.13 |
+75:52:50.3 |
HIP 19844 |
18.06 |
| 2026-10-10 00:00 |
04:10:06.66 |
+75:53:28.0 |
HIP 19844 |
19.29 |
| 2026-10-10 12:00 |
04:09:48.01 |
+75:54:05.1 |
HIP 19844 |
20.53 |
| 2026-10-11 00:00 |
04:09:29.19 |
+75:54:41.8 |
HIP 19844 |
21.79 |