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) |
| 2026-09-20 00:00 |
10:19:48.45 |
-39:49:20.7 |
HIP 50590 |
7.88 |
| 2026-09-20 12:00 |
10:20:00.35 |
-39:51:21.6 |
HIP 50590 |
9.26 |
| 2026-09-21 00:00 |
10:20:12.21 |
-39:53:23.2 |
HIP 50590 |
11.32 |
| 2026-09-21 12:00 |
10:20:24.03 |
-39:55:25.5 |
HIP 50590 |
13.76 |
| 2026-09-22 00:00 |
10:20:35.81 |
-39:57:28.4 |
HIP 50590 |
16.41 |
| 2026-09-22 12:00 |
10:20:47.55 |
-39:59:32.0 |
HIP 50590 |
19.19 |
| 2026-09-23 00:00 |
10:20:59.25 |
-40:01:36.3 |
HIP 50590 |
22.04 |
| 2026-09-23 12:00 |
10:21:10.91 |
-40:03:41.1 |
HIP 50590 |
24.95 |
| 2026-09-24 00:00 |
10:21:22.53 |
-40:05:46.7 |
HIP 50590 |
27.89 |
| 2026-09-24 12:00 |
10:21:34.10 |
-40:07:52.8 |
HIP 50590 |
30.86 |
| 2026-09-25 00:00 |
10:21:45.63 |
-40:09:59.6 |
HIP 50590 |
33.85 |
| 2026-09-25 12:00 |
10:21:57.12 |
-40:12:07.0 |
HIP 50873 |
33.30 |
| 2026-09-26 00:00 |
10:22:08.56 |
-40:14:15.0 |
HIP 50873 |
30.42 |
| 2026-09-26 12:00 |
10:22:19.96 |
-40:16:23.7 |
HIP 50873 |
27.57 |
| 2026-09-27 00:00 |
10:22:31.32 |
-40:18:32.9 |
HIP 50873 |
24.76 |
| 2026-09-27 12:00 |
10:22:42.62 |
-40:20:42.8 |
HIP 50873 |
22.02 |
| 2026-09-28 00:00 |
10:22:53.89 |
-40:22:53.3 |
HIP 50873 |
19.35 |
| 2026-09-28 12:00 |
10:23:05.10 |
-40:25:04.4 |
HIP 50873 |
16.81 |
| 2026-09-29 00:00 |
10:23:16.27 |
-40:27:16.1 |
HIP 50873 |
14.46 |
| 2026-09-29 12:00 |
10:23:27.39 |
-40:29:28.4 |
HIP 50873 |
12.41 |
| 2026-09-30 00:00 |
10:23:38.46 |
-40:31:41.2 |
HIP 50873 |
10.83 |
| 2026-09-30 12:00 |
10:23:49.48 |
-40:33:54.7 |
HIP 50873 |
9.94 |
| 2026-10-01 00:00 |
10:24:00.45 |
-40:36:08.7 |
HIP 50873 |
9.93 |
| 2026-10-01 12:00 |
10:24:11.37 |
-40:38:23.4 |
HIP 50873 |
10.81 |
| 2026-10-02 00:00 |
10:24:22.23 |
-40:40:38.6 |
HIP 50873 |
12.39 |
| 2026-10-02 12:00 |
10:24:33.05 |
-40:42:54.4 |
HIP 50873 |
14.44 |
| 2026-10-03 00:00 |
10:24:43.82 |
-40:45:10.7 |
HIP 50873 |
16.78 |
| 2026-10-03 12:00 |
10:24:54.53 |
-40:47:27.6 |
HIP 50873 |
19.32 |
| 2026-10-04 00:00 |
10:25:05.18 |
-40:49:45.1 |
HIP 50962 |
19.60 |
| 2026-10-04 12:00 |
10:25:15.79 |
-40:52:03.2 |
HIP 50962 |
18.18 |
| 2026-10-05 00:00 |
10:25:26.34 |
-40:54:21.7 |
HIP 50962 |
17.18 |
| 2026-10-05 12:00 |
10:25:36.83 |
-40:56:40.9 |
HIP 50962 |
16.67 |
| 2026-10-06 00:00 |
10:25:47.26 |
-40:59:00.5 |
HIP 51126 |
15.38 |
| 2026-10-06 12:00 |
10:25:57.64 |
-41:01:20.8 |
HIP 51126 |
12.33 |
| 2026-10-07 00:00 |
10:26:07.96 |
-41:03:41.5 |
HIP 51126 |
9.29 |
| 2026-10-07 12:00 |
10:26:18.22 |
-41:06:02.8 |
HIP 51126 |
6.25 |
| 2026-10-08 00:00 |
10:26:28.42 |
-41:08:24.6 |
HIP 51126 |
3.22 |
| 2026-10-08 12:00 |
10:26:38.57 |
-41:10:46.9 |
HIP 51126 |
0.51 |
| 2026-10-09 00:00 |
10:26:48.65 |
-41:13:09.7 |
HIP 51126 |
2.95 |
| 2026-10-09 12:00 |
10:26:58.67 |
-41:15:33.0 |
HIP 51126 |
5.97 |
| 2026-10-10 00:00 |
10:27:08.62 |
-41:17:56.9 |
HIP 51164 |
8.76 |
| 2026-10-10 12:00 |
10:27:18.52 |
-41:20:21.2 |
HIP 51164 |
11.45 |
| 2026-10-11 00:00 |
10:27:28.35 |
-41:22:46.0 |
HIP 51164 |
14.28 |