C/2022 W2 (ATLAS)
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) |
| 2026-02-03 00:00 |
10:11:59.40 |
-42:36:02.4 |
HIP 49921 |
23.17 |
| 2026-02-03 12:00 |
10:11:43.55 |
-42:36:57.3 |
HIP 49921 |
23.65 |
| 2026-02-04 00:00 |
10:11:27.65 |
-42:37:50.6 |
HIP 49921 |
24.49 |
| 2026-02-04 12:00 |
10:11:11.69 |
-42:38:42.2 |
HIP 49921 |
25.64 |
| 2026-02-05 00:00 |
10:10:55.69 |
-42:39:32.2 |
HIP 49921 |
27.06 |
| 2026-02-05 12:00 |
10:10:39.64 |
-42:40:20.6 |
HIP 49921 |
28.72 |
| 2026-02-06 00:00 |
10:10:23.54 |
-42:41:07.4 |
HIP 49921 |
30.58 |
| 2026-02-06 12:00 |
10:10:07.40 |
-42:41:52.5 |
HIP 49618 |
31.72 |
| 2026-02-07 00:00 |
10:09:51.21 |
-42:42:36.0 |
HIP 49618 |
29.50 |
| 2026-02-07 12:00 |
10:09:34.99 |
-42:43:17.9 |
HIP 49598 |
27.27 |
| 2026-02-08 00:00 |
10:09:18.72 |
-42:43:58.1 |
HIP 49598 |
24.40 |
| 2026-02-08 12:00 |
10:09:02.43 |
-42:44:36.7 |
HIP 49598 |
21.59 |
| 2026-02-09 00:00 |
10:08:46.09 |
-42:45:13.7 |
HIP 49598 |
18.87 |
| 2026-02-09 12:00 |
10:08:29.72 |
-42:45:49.0 |
HIP 49598 |
16.29 |
| 2026-02-10 00:00 |
10:08:13.33 |
-42:46:22.7 |
HIP 49598 |
13.92 |
| 2026-02-10 12:00 |
10:07:56.90 |
-42:46:54.8 |
HIP 49598 |
11.90 |
| 2026-02-11 00:00 |
10:07:40.44 |
-42:47:25.2 |
HIP 49598 |
10.41 |
| 2026-02-11 12:00 |
10:07:23.96 |
-42:47:54.0 |
HIP 49598 |
9.72 |
| 2026-02-12 00:00 |
10:07:07.46 |
-42:48:21.1 |
HIP 49598 |
10.00 |
| 2026-02-12 12:00 |
10:06:50.93 |
-42:48:46.6 |
HIP 49598 |
11.16 |
| 2026-02-13 00:00 |
10:06:34.39 |
-42:49:10.5 |
HIP 49598 |
12.97 |
| 2026-02-13 12:00 |
10:06:17.83 |
-42:49:32.7 |
HIP 49598 |
15.21 |
| 2026-02-14 00:00 |
10:06:01.25 |
-42:49:53.3 |
HIP 49598 |
17.70 |
| 2026-02-14 12:00 |
10:05:44.66 |
-42:50:12.2 |
HIP 49475 |
19.05 |
| 2026-02-15 00:00 |
10:05:28.06 |
-42:50:29.6 |
HIP 49332 |
17.36 |
| 2026-02-15 12:00 |
10:05:11.45 |
-42:50:45.3 |
HIP 49332 |
15.13 |
| 2026-02-16 00:00 |
10:04:54.83 |
-42:50:59.3 |
HIP 49332 |
13.22 |
| 2026-02-16 12:00 |
10:04:38.21 |
-42:51:11.7 |
HIP 49332 |
11.78 |
| 2026-02-17 00:00 |
10:04:21.58 |
-42:51:22.5 |
HIP 49332 |
11.00 |
| 2026-02-17 12:00 |
10:04:04.95 |
-42:51:31.7 |
HIP 49332 |
11.00 |
| 2026-02-18 00:00 |
10:03:48.32 |
-42:51:39.3 |
HIP 49332 |
11.80 |
| 2026-02-18 12:00 |
10:03:31.70 |
-42:51:45.3 |
HIP 49332 |
13.25 |
| 2026-02-19 00:00 |
10:03:15.08 |
-42:51:49.6 |
HIP 49332 |
15.16 |
| 2026-02-19 12:00 |
10:02:58.46 |
-42:51:52.4 |
HIP 49332 |
17.39 |
| 2026-02-20 00:00 |
10:02:41.86 |
-42:51:53.5 |
HIP 49187 |
16.85 |
| 2026-02-20 12:00 |
10:02:25.27 |
-42:51:53.1 |
HIP 49187 |
16.44 |
| 2026-02-21 00:00 |
10:02:08.69 |
-42:51:51.1 |
HIP 49187 |
16.62 |
| 2026-02-21 12:00 |
10:01:52.12 |
-42:51:47.5 |
HIP 49047 |
15.66 |
| 2026-02-22 00:00 |
10:01:35.57 |
-42:51:42.3 |
HIP 49047 |
12.65 |
| 2026-02-22 12:00 |
10:01:19.04 |
-42:51:35.5 |
HIP 49047 |
9.67 |
| 2026-02-23 00:00 |
10:01:02.54 |
-42:51:27.2 |
HIP 49047 |
6.74 |
| 2026-02-23 12:00 |
10:00:46.05 |
-42:51:17.4 |
HIP 49047 |
3.97 |
| 2026-02-24 00:00 |
10:00:29.59 |
-42:51:05.9 |
HIP 49047 |
2.14 |