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) |
| 2026-07-29 00:00 |
09:57:14.16 |
-37:30:23.5 |
HIP 48623 |
29.42 |
| 2026-07-29 12:00 |
09:57:26.67 |
-37:30:55.7 |
HIP 48623 |
31.94 |
| 2026-07-30 00:00 |
09:57:39.22 |
-37:31:28.8 |
HIP 48623 |
34.48 |
| 2026-07-30 12:00 |
09:57:51.79 |
-37:32:02.9 |
HIP 48623 |
37.02 |
| 2026-07-31 00:00 |
09:58:04.38 |
-37:32:37.9 |
HIP 48623 |
39.58 |
| 2026-07-31 12:00 |
09:58:16.99 |
-37:33:13.9 |
HIP 48623 |
42.14 |
| 2026-08-01 00:00 |
09:58:29.63 |
-37:33:50.8 |
HIP 48623 |
44.72 |
| 2026-08-01 12:00 |
09:58:42.30 |
-37:34:28.7 |
HIP 49112 |
44.84 |
| 2026-08-02 00:00 |
09:58:54.98 |
-37:35:07.5 |
HIP 49112 |
42.62 |
| 2026-08-02 12:00 |
09:59:07.69 |
-37:35:47.2 |
HIP 49112 |
40.43 |
| 2026-08-03 00:00 |
09:59:20.41 |
-37:36:27.9 |
HIP 49112 |
38.27 |
| 2026-08-03 12:00 |
09:59:33.16 |
-37:37:09.5 |
HIP 49112 |
36.16 |
| 2026-08-04 00:00 |
09:59:45.93 |
-37:37:52.1 |
HIP 49112 |
34.10 |
| 2026-08-04 12:00 |
09:59:58.72 |
-37:38:35.6 |
HIP 49112 |
32.11 |
| 2026-08-05 00:00 |
10:00:11.52 |
-37:39:20.0 |
HIP 49112 |
30.20 |
| 2026-08-05 12:00 |
10:00:24.35 |
-37:40:05.4 |
HIP 49112 |
28.39 |
| 2026-08-06 00:00 |
10:00:37.19 |
-37:40:51.7 |
HIP 49112 |
26.70 |
| 2026-08-06 12:00 |
10:00:50.05 |
-37:41:38.9 |
HIP 49118 |
25.13 |
| 2026-08-07 00:00 |
10:01:02.93 |
-37:42:27.1 |
HIP 49118 |
23.65 |
| 2026-08-07 12:00 |
10:01:15.82 |
-37:43:16.2 |
HIP 49118 |
22.39 |
| 2026-08-08 00:00 |
10:01:28.73 |
-37:44:06.2 |
HIP 49118 |
21.36 |
| 2026-08-08 12:00 |
10:01:41.65 |
-37:44:57.1 |
HIP 49118 |
20.63 |
| 2026-08-09 00:00 |
10:01:54.59 |
-37:45:49.0 |
HIP 49118 |
20.21 |
| 2026-08-09 12:00 |
10:02:07.54 |
-37:46:41.8 |
HIP 49118 |
20.13 |
| 2026-08-10 00:00 |
10:02:20.50 |
-37:47:35.6 |
HIP 49118 |
20.39 |
| 2026-08-10 12:00 |
10:02:33.48 |
-37:48:30.2 |
HIP 49118 |
21.00 |
| 2026-08-11 00:00 |
10:02:46.46 |
-37:49:25.8 |
HIP 49118 |
21.92 |
| 2026-08-11 12:00 |
10:02:59.46 |
-37:50:22.3 |
HIP 49118 |
23.11 |
| 2026-08-12 00:00 |
10:03:12.47 |
-37:51:19.7 |
HIP 49118 |
24.54 |
| 2026-08-12 12:00 |
10:03:25.49 |
-37:52:18.1 |
HIP 49118 |
26.18 |
| 2026-08-13 00:00 |
10:03:38.52 |
-37:53:17.3 |
HIP 49118 |
27.98 |
| 2026-08-13 12:00 |
10:03:51.55 |
-37:54:17.5 |
HIP 49118 |
29.92 |
| 2026-08-14 00:00 |
10:04:04.59 |
-37:55:18.6 |
HIP 49118 |
31.98 |
| 2026-08-14 12:00 |
10:04:17.64 |
-37:56:20.5 |
HIP 49118 |
34.13 |
| 2026-08-15 00:00 |
10:04:30.70 |
-37:57:23.4 |
HIP 49118 |
36.36 |
| 2026-08-15 12:00 |
10:04:43.76 |
-37:58:27.2 |
HIP 49118 |
38.67 |
| 2026-08-16 00:00 |
10:04:56.83 |
-37:59:31.9 |
HIP 49118 |
41.02 |
| 2026-08-16 12:00 |
10:05:09.90 |
-38:00:37.5 |
HIP 49599 |
40.89 |
| 2026-08-17 00:00 |
10:05:22.97 |
-38:01:44.0 |
HIP 49599 |
40.07 |
| 2026-08-17 12:00 |
10:05:36.05 |
-38:02:51.3 |
HIP 49599 |
39.45 |
| 2026-08-18 00:00 |
10:05:49.13 |
-38:03:59.6 |
HIP 49599 |
39.03 |
| 2026-08-18 12:00 |
10:06:02.21 |
-38:05:08.7 |
HIP 49599 |
38.83 |
| 2026-08-19 00:00 |
10:06:15.29 |
-38:06:18.7 |
HIP 49599 |
38.85 |