メタデータ
| 項目 |
値 |
| Designation |
C/2022 P1 (NEOWISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-11-28T11:23:56.353920Z |
| Orbit solution date (soln_date, UTC) |
2023-06-30T22:17:01Z |
| Obs used |
696 |
| NEO |
- |
| M1 |
11.500 |
| K1 |
13.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2022-08-08T08:24:35.424000Z |
| Discovery magnitude (MPC) |
18.00 R |
| Discovery observatory (MPC) |
C51 · WISE |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-10-18.0000000 |
| e |
0.91345543 |
| q (au) |
1.595184 |
| a (au) |
18.431934 |
| i (deg) |
154.606664 |
| Ω (om, deg) |
205.081648 |
| ω (w, deg) |
249.934454 |
| M (ma, deg) |
359.483425 |
等級
散乱 + 全体線形
$$
M_a = (10.149 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.149 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
0.999 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2022-08-08 |
2022-11-26 |
+30.4030 |
-9.310 |
| 2022-12-07 |
2023-06-16 |
+15.1448 |
-6.764 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
12:03:15.26 |
+13:07:53.7 |
HIP 58743 |
20.17 |
| 2026-09-25 12:00 |
12:03:23.27 |
+13:07:16.0 |
HIP 58743 |
20.18 |
| 2026-09-26 00:00 |
12:03:31.28 |
+13:06:38.6 |
HIP 58743 |
20.41 |
| 2026-09-26 12:00 |
12:03:39.28 |
+13:06:01.6 |
HIP 58743 |
20.83 |
| 2026-09-27 00:00 |
12:03:47.27 |
+13:05:24.8 |
HIP 58743 |
21.45 |
| 2026-09-27 12:00 |
12:03:55.26 |
+13:04:48.3 |
HIP 58743 |
22.25 |
| 2026-09-28 00:00 |
12:04:03.25 |
+13:04:12.1 |
HIP 58743 |
23.19 |
| 2026-09-28 12:00 |
12:04:11.22 |
+13:03:36.2 |
HIP 58743 |
24.28 |
| 2026-09-29 00:00 |
12:04:19.19 |
+13:03:00.7 |
HIP 58743 |
25.48 |
| 2026-09-29 12:00 |
12:04:27.15 |
+13:02:25.4 |
HIP 58743 |
26.78 |
| 2026-09-30 00:00 |
12:04:35.11 |
+13:01:50.5 |
HIP 58943 |
27.84 |
| 2026-09-30 12:00 |
12:04:43.05 |
+13:01:15.8 |
HIP 58943 |
27.88 |
| 2026-10-01 00:00 |
12:04:50.99 |
+13:00:41.6 |
HIP 58943 |
28.06 |
| 2026-10-01 12:00 |
12:04:58.91 |
+13:00:07.6 |
HIP 58943 |
28.37 |
| 2026-10-02 00:00 |
12:05:06.83 |
+12:59:34.0 |
HIP 58943 |
28.82 |
| 2026-10-02 12:00 |
12:05:14.73 |
+12:59:00.7 |
HIP 59099 |
28.28 |
| 2026-10-03 00:00 |
12:05:22.63 |
+12:58:27.7 |
HIP 59099 |
26.36 |
| 2026-10-03 12:00 |
12:05:30.51 |
+12:57:55.1 |
HIP 59099 |
24.47 |
| 2026-10-04 00:00 |
12:05:38.38 |
+12:57:22.8 |
HIP 59099 |
22.59 |
| 2026-10-04 12:00 |
12:05:46.24 |
+12:56:50.9 |
HIP 59099 |
20.73 |
| 2026-10-05 00:00 |
12:05:54.08 |
+12:56:19.3 |
HIP 59099 |
18.90 |
| 2026-10-05 12:00 |
12:06:01.91 |
+12:55:48.0 |
HIP 59099 |
17.11 |
| 2026-10-06 00:00 |
12:06:09.72 |
+12:55:17.2 |
HIP 59099 |
15.37 |
| 2026-10-06 12:00 |
12:06:17.52 |
+12:54:46.7 |
HIP 59099 |
13.69 |
| 2026-10-07 00:00 |
12:06:25.31 |
+12:54:16.5 |
HIP 59099 |
12.10 |
| 2026-10-07 12:00 |
12:06:33.08 |
+12:53:46.8 |
HIP 59099 |
10.64 |
| 2026-10-08 00:00 |
12:06:40.83 |
+12:53:17.4 |
HIP 59099 |
9.36 |
| 2026-10-08 12:00 |
12:06:48.57 |
+12:52:48.4 |
HIP 59099 |
8.33 |
| 2026-10-09 00:00 |
12:06:56.28 |
+12:52:19.7 |
HIP 59099 |
7.67 |
| 2026-10-09 12:00 |
12:07:03.98 |
+12:51:51.5 |
HIP 59099 |
7.46 |
| 2026-10-10 00:00 |
12:07:11.66 |
+12:51:23.6 |
HIP 59099 |
7.74 |
| 2026-10-10 12:00 |
12:07:19.32 |
+12:50:56.1 |
HIP 59099 |
8.46 |
| 2026-10-11 00:00 |
12:07:26.96 |
+12:50:29.1 |
HIP 59099 |
9.50 |
| 2026-10-11 12:00 |
12:07:34.58 |
+12:50:02.4 |
HIP 59099 |
10.78 |
| 2026-10-12 00:00 |
12:07:42.18 |
+12:49:36.1 |
HIP 59137 |
10.76 |
| 2026-10-12 12:00 |
12:07:49.76 |
+12:49:10.3 |
HIP 59137 |
10.76 |
| 2026-10-13 00:00 |
12:07:57.31 |
+12:48:44.8 |
HIP 59137 |
11.09 |
| 2026-10-13 12:00 |
12:08:04.84 |
+12:48:19.8 |
HIP 59137 |
11.73 |
| 2026-10-14 00:00 |
12:08:12.35 |
+12:47:55.1 |
HIP 59137 |
12.61 |
| 2026-10-14 12:00 |
12:08:19.83 |
+12:47:30.9 |
HIP 59137 |
13.70 |
| 2026-10-15 00:00 |
12:08:27.29 |
+12:47:07.1 |
HIP 59137 |
14.94 |
| 2026-10-15 12:00 |
12:08:34.72 |
+12:46:43.8 |
HIP 59137 |
16.30 |
| 2026-10-16 00:00 |
12:08:42.13 |
+12:46:20.8 |
HIP 59137 |
17.75 |