C/2022 P1 (NEOWISE)
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) |
| 2026-02-03 00:00 |
12:30:39.92 |
+10:48:42.4 |
HIP 60943 |
26.35 |
| 2026-02-03 12:00 |
12:30:31.06 |
+10:50:29.8 |
HIP 60943 |
23.57 |
| 2026-02-04 00:00 |
12:30:22.10 |
+10:52:17.6 |
HIP 60943 |
20.78 |
| 2026-02-04 12:00 |
12:30:13.05 |
+10:54:05.6 |
HIP 60943 |
17.99 |
| 2026-02-05 00:00 |
12:30:03.91 |
+10:55:54.1 |
HIP 60943 |
15.20 |
| 2026-02-05 12:00 |
12:29:54.68 |
+10:57:42.8 |
HIP 60943 |
12.44 |
| 2026-02-06 00:00 |
12:29:45.35 |
+10:59:31.8 |
HIP 60943 |
9.75 |
| 2026-02-06 12:00 |
12:29:35.93 |
+11:01:21.2 |
HIP 60943 |
7.23 |
| 2026-02-07 00:00 |
12:29:26.43 |
+11:03:10.9 |
HIP 60943 |
5.17 |
| 2026-02-07 12:00 |
12:29:16.83 |
+11:05:00.8 |
HIP 60943 |
4.35 |
| 2026-02-08 00:00 |
12:29:07.14 |
+11:06:51.0 |
HIP 60943 |
5.39 |
| 2026-02-08 12:00 |
12:28:57.37 |
+11:08:41.5 |
HIP 60943 |
7.59 |
| 2026-02-09 00:00 |
12:28:47.51 |
+11:10:32.3 |
HIP 60943 |
10.24 |
| 2026-02-09 12:00 |
12:28:37.56 |
+11:12:23.3 |
HIP 60943 |
13.08 |
| 2026-02-10 00:00 |
12:28:27.52 |
+11:14:14.6 |
HIP 60784 |
15.28 |
| 2026-02-10 12:00 |
12:28:17.39 |
+11:16:06.1 |
HIP 60784 |
14.00 |
| 2026-02-11 00:00 |
12:28:07.19 |
+11:17:57.9 |
HIP 60784 |
13.32 |
| 2026-02-11 12:00 |
12:27:56.89 |
+11:19:49.8 |
HIP 60784 |
13.35 |
| 2026-02-12 00:00 |
12:27:46.51 |
+11:21:42.0 |
HIP 60784 |
14.09 |
| 2026-02-12 12:00 |
12:27:36.05 |
+11:23:34.4 |
HIP 60784 |
15.46 |
| 2026-02-13 00:00 |
12:27:25.51 |
+11:25:26.9 |
HIP 60784 |
17.31 |
| 2026-02-13 12:00 |
12:27:14.89 |
+11:27:19.7 |
HIP 60784 |
19.52 |
| 2026-02-14 00:00 |
12:27:04.18 |
+11:29:12.6 |
HIP 60784 |
21.98 |
| 2026-02-14 12:00 |
12:26:53.40 |
+11:31:05.7 |
HIP 60784 |
24.64 |
| 2026-02-15 00:00 |
12:26:42.53 |
+11:32:58.9 |
HIP 60784 |
27.43 |
| 2026-02-15 12:00 |
12:26:31.59 |
+11:34:52.3 |
HIP 60607 |
26.25 |
| 2026-02-16 00:00 |
12:26:20.57 |
+11:36:45.8 |
HIP 60607 |
23.07 |
| 2026-02-16 12:00 |
12:26:09.47 |
+11:38:39.4 |
HIP 60607 |
19.90 |
| 2026-02-17 00:00 |
12:25:58.30 |
+11:40:33.1 |
HIP 60607 |
16.78 |
| 2026-02-17 12:00 |
12:25:47.06 |
+11:42:27.0 |
HIP 60607 |
13.74 |
| 2026-02-18 00:00 |
12:25:35.74 |
+11:44:20.9 |
HIP 60607 |
10.88 |
| 2026-02-18 12:00 |
12:25:24.34 |
+11:46:14.9 |
HIP 60607 |
8.39 |
| 2026-02-19 00:00 |
12:25:12.88 |
+11:48:09.0 |
HIP 60607 |
6.73 |
| 2026-02-19 12:00 |
12:25:01.34 |
+11:50:03.1 |
HIP 60607 |
6.58 |
| 2026-02-20 00:00 |
12:24:49.74 |
+11:51:57.3 |
HIP 60607 |
8.04 |
| 2026-02-20 12:00 |
12:24:38.07 |
+11:53:51.5 |
HIP 60607 |
10.48 |
| 2026-02-21 00:00 |
12:24:26.33 |
+11:55:45.8 |
HIP 60460 |
10.72 |
| 2026-02-21 12:00 |
12:24:14.52 |
+11:57:40.0 |
HIP 60460 |
8.19 |
| 2026-02-22 00:00 |
12:24:02.65 |
+11:59:34.3 |
HIP 60460 |
6.56 |
| 2026-02-22 12:00 |
12:23:50.71 |
+12:01:28.6 |
HIP 60460 |
6.56 |
| 2026-02-23 00:00 |
12:23:38.71 |
+12:03:22.8 |
HIP 60460 |
8.20 |
| 2026-02-23 12:00 |
12:23:26.65 |
+12:05:17.0 |
HIP 60460 |
10.78 |
| 2026-02-24 00:00 |
12:23:14.52 |
+12:07:11.2 |
HIP 60460 |
13.78 |