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 |
1.000 |
| 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) |
| 2026-03-26 00:00 |
12:09:58.56 |
+13:54:16.0 |
HIP 59386 |
34.60 |
| 2026-03-26 12:00 |
12:09:44.93 |
+13:55:50.2 |
HIP 59386 |
34.81 |
| 2026-03-27 00:00 |
12:09:31.31 |
+13:57:23.8 |
HIP 59386 |
35.40 |
| 2026-03-27 12:00 |
12:09:17.71 |
+13:58:56.8 |
HIP 59327 |
35.46 |
| 2026-03-28 00:00 |
12:09:04.12 |
+14:00:29.2 |
HIP 59327 |
35.50 |
| 2026-03-28 12:00 |
12:08:50.55 |
+14:02:01.0 |
HIP 59138 |
35.91 |
| 2026-03-29 00:00 |
12:08:37.00 |
+14:03:32.1 |
HIP 59138 |
35.74 |
| 2026-03-29 12:00 |
12:08:23.48 |
+14:05:02.7 |
HIP 59138 |
35.93 |
| 2026-03-30 00:00 |
12:08:09.97 |
+14:06:32.6 |
HIP 59138 |
36.48 |
| 2026-03-30 12:00 |
12:07:56.49 |
+14:08:01.9 |
HIP 59138 |
37.35 |
| 2026-03-31 00:00 |
12:07:43.03 |
+14:09:30.6 |
HIP 59014 |
38.49 |
| 2026-03-31 12:00 |
12:07:29.60 |
+14:10:58.6 |
HIP 59014 |
35.31 |
| 2026-04-01 00:00 |
12:07:16.19 |
+14:12:25.9 |
HIP 59014 |
32.22 |
| 2026-04-01 12:00 |
12:07:02.81 |
+14:13:52.6 |
HIP 59014 |
29.26 |
| 2026-04-02 00:00 |
12:06:49.46 |
+14:15:18.7 |
HIP 59014 |
26.44 |
| 2026-04-02 12:00 |
12:06:36.14 |
+14:16:44.1 |
HIP 59014 |
23.84 |
| 2026-04-03 00:00 |
12:06:22.85 |
+14:18:08.8 |
HIP 59014 |
21.51 |
| 2026-04-03 12:00 |
12:06:09.59 |
+14:19:32.8 |
HIP 59014 |
19.56 |
| 2026-04-04 00:00 |
12:05:56.36 |
+14:20:56.2 |
HIP 59014 |
18.08 |
| 2026-04-04 12:00 |
12:05:43.17 |
+14:22:18.9 |
HIP 59014 |
17.21 |
| 2026-04-05 00:00 |
12:05:30.02 |
+14:23:40.9 |
HIP 59014 |
17.02 |
| 2026-04-05 12:00 |
12:05:16.90 |
+14:25:02.2 |
HIP 59014 |
17.54 |
| 2026-04-06 00:00 |
12:05:03.81 |
+14:26:22.8 |
HIP 59014 |
18.69 |
| 2026-04-06 12:00 |
12:04:50.77 |
+14:27:42.7 |
HIP 59014 |
20.36 |
| 2026-04-07 00:00 |
12:04:37.77 |
+14:29:01.8 |
HIP 59014 |
22.42 |
| 2026-04-07 12:00 |
12:04:24.80 |
+14:30:20.3 |
HIP 58951 |
23.85 |
| 2026-04-08 00:00 |
12:04:11.88 |
+14:31:38.1 |
HIP 58951 |
24.50 |
| 2026-04-08 12:00 |
12:03:59.00 |
+14:32:55.1 |
HIP 58735 |
21.92 |
| 2026-04-09 00:00 |
12:03:46.17 |
+14:34:11.5 |
HIP 58735 |
18.73 |
| 2026-04-09 12:00 |
12:03:33.38 |
+14:35:27.1 |
HIP 58735 |
15.63 |
| 2026-04-10 00:00 |
12:03:20.64 |
+14:36:41.9 |
HIP 58735 |
12.67 |
| 2026-04-10 12:00 |
12:03:07.94 |
+14:37:56.1 |
HIP 58735 |
9.95 |
| 2026-04-11 00:00 |
12:02:55.29 |
+14:39:09.5 |
HIP 58735 |
7.73 |
| 2026-04-11 12:00 |
12:02:42.70 |
+14:40:22.1 |
HIP 58735 |
6.51 |
| 2026-04-12 00:00 |
12:02:30.15 |
+14:41:34.0 |
HIP 58735 |
6.81 |
| 2026-04-12 12:00 |
12:02:17.65 |
+14:42:45.2 |
HIP 58735 |
8.46 |
| 2026-04-13 00:00 |
12:02:05.21 |
+14:43:55.6 |
HIP 58735 |
10.85 |
| 2026-04-13 12:00 |
12:01:52.82 |
+14:45:05.2 |
HIP 58735 |
13.58 |
| 2026-04-14 00:00 |
12:01:40.48 |
+14:46:14.1 |
HIP 58735 |
16.47 |
| 2026-04-14 12:00 |
12:01:28.20 |
+14:47:22.2 |
HIP 58735 |
19.44 |
| 2026-04-15 00:00 |
12:01:15.98 |
+14:48:29.6 |
HIP 58735 |
22.45 |
| 2026-04-15 12:00 |
12:01:03.81 |
+14:49:36.1 |
HIP 58735 |
25.49 |
| 2026-04-16 00:00 |
12:00:51.70 |
+14:50:41.9 |
HIP 58735 |
28.53 |