メタデータ
| 項目 |
値 |
| Designation |
C/2022 W2 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-03-08T16:29:49.200000Z |
| Orbit solution date (soln_date, UTC) |
2024-03-12T13:12:41Z |
| Obs used |
250 |
| NEO |
- |
| M1 |
7.700 |
| K1 |
17.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-11-24T05:40:11.481600Z |
| Discovery magnitude (MPC) |
19.14 o |
| Discovery observatory (MPC) |
T05 · ATLAS-HKO, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2023-01-17.0000000 |
| e |
0.99064934 |
| q (au) |
3.122791 |
| a (au) |
333.964717 |
| i (deg) |
63.532535 |
| Ω (om, deg) |
320.448256 |
| ω (w, deg) |
123.259626 |
| M (ma, deg) |
359.991814 |
等級
散乱 + 全体線形
$$
M_a = (7.924 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.924 |
| 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) |
| 2026-03-26 00:00 |
09:45:52.12 |
-41:58:22.7 |
HIP 47898 |
18.42 |
| 2026-03-26 12:00 |
09:45:40.28 |
-41:56:56.0 |
HIP 47898 |
16.93 |
| 2026-03-27 00:00 |
09:45:28.57 |
-41:55:28.5 |
HIP 47898 |
15.72 |
| 2026-03-27 12:00 |
09:45:16.97 |
-41:54:00.2 |
HIP 47898 |
14.86 |
| 2026-03-28 00:00 |
09:45:05.49 |
-41:52:31.1 |
HIP 47898 |
14.41 |
| 2026-03-28 12:00 |
09:44:54.13 |
-41:51:01.2 |
HIP 47898 |
14.39 |
| 2026-03-29 00:00 |
09:44:42.89 |
-41:49:30.6 |
HIP 47898 |
14.82 |
| 2026-03-29 12:00 |
09:44:31.77 |
-41:47:59.2 |
HIP 47898 |
15.64 |
| 2026-03-30 00:00 |
09:44:20.77 |
-41:46:27.1 |
HIP 47898 |
16.79 |
| 2026-03-30 12:00 |
09:44:09.89 |
-41:44:54.3 |
HIP 47898 |
18.21 |
| 2026-03-31 00:00 |
09:43:59.14 |
-41:43:20.8 |
HIP 47898 |
19.84 |
| 2026-03-31 12:00 |
09:43:48.51 |
-41:41:46.5 |
HIP 47898 |
21.62 |
| 2026-04-01 00:00 |
09:43:38.01 |
-41:40:11.7 |
HIP 47898 |
23.51 |
| 2026-04-01 12:00 |
09:43:27.63 |
-41:38:36.1 |
HIP 47724 |
24.38 |
| 2026-04-02 00:00 |
09:43:17.38 |
-41:37:00.0 |
HIP 47724 |
23.14 |
| 2026-04-02 12:00 |
09:43:07.25 |
-41:35:23.2 |
HIP 47724 |
22.09 |
| 2026-04-03 00:00 |
09:42:57.25 |
-41:33:45.8 |
HIP 47724 |
21.27 |
| 2026-04-03 12:00 |
09:42:47.38 |
-41:32:07.8 |
HIP 47724 |
20.70 |
| 2026-04-04 00:00 |
09:42:37.63 |
-41:30:29.2 |
HIP 47724 |
20.38 |
| 2026-04-04 12:00 |
09:42:28.02 |
-41:28:50.0 |
HIP 47724 |
20.34 |
| 2026-04-05 00:00 |
09:42:18.53 |
-41:27:10.3 |
HIP 47724 |
20.57 |
| 2026-04-05 12:00 |
09:42:09.17 |
-41:25:30.1 |
HIP 47724 |
21.05 |
| 2026-04-06 00:00 |
09:41:59.94 |
-41:23:49.3 |
HIP 47724 |
21.77 |
| 2026-04-06 12:00 |
09:41:50.85 |
-41:22:08.1 |
HIP 47445 |
21.66 |
| 2026-04-07 00:00 |
09:41:41.88 |
-41:20:26.3 |
HIP 47445 |
19.38 |
| 2026-04-07 12:00 |
09:41:33.05 |
-41:18:44.1 |
HIP 47445 |
17.14 |
| 2026-04-08 00:00 |
09:41:24.35 |
-41:17:01.4 |
HIP 47445 |
14.97 |
| 2026-04-08 12:00 |
09:41:15.78 |
-41:15:18.2 |
HIP 47445 |
12.89 |
| 2026-04-09 00:00 |
09:41:07.34 |
-41:13:34.6 |
HIP 47445 |
10.94 |
| 2026-04-09 12:00 |
09:40:59.04 |
-41:11:50.6 |
HIP 47445 |
9.21 |
| 2026-04-10 00:00 |
09:40:50.87 |
-41:10:06.2 |
HIP 47445 |
7.81 |
| 2026-04-10 12:00 |
09:40:42.83 |
-41:08:21.4 |
HIP 47445 |
6.96 |
| 2026-04-11 00:00 |
09:40:34.93 |
-41:06:36.2 |
HIP 47445 |
6.84 |
| 2026-04-11 12:00 |
09:40:27.17 |
-41:04:50.7 |
HIP 47445 |
7.48 |
| 2026-04-12 00:00 |
09:40:19.54 |
-41:03:04.8 |
HIP 47425 |
6.26 |
| 2026-04-12 12:00 |
09:40:12.04 |
-41:01:18.6 |
HIP 47425 |
5.52 |
| 2026-04-13 00:00 |
09:40:04.68 |
-40:59:32.1 |
HIP 47425 |
5.68 |
| 2026-04-13 12:00 |
09:39:57.46 |
-40:57:45.3 |
HIP 47425 |
6.66 |
| 2026-04-14 00:00 |
09:39:50.38 |
-40:55:58.2 |
HIP 47428 |
6.63 |
| 2026-04-14 12:00 |
09:39:43.43 |
-40:54:10.8 |
HIP 47428 |
4.89 |
| 2026-04-15 00:00 |
09:39:36.61 |
-40:52:23.2 |
HIP 47428 |
3.67 |
| 2026-04-15 12:00 |
09:39:29.94 |
-40:50:35.3 |
HIP 47428 |
3.56 |
| 2026-04-16 00:00 |
09:39:23.40 |
-40:48:47.3 |
HIP 47428 |
4.61 |