メタデータ
| 項目 |
値 |
| Designation |
C/1964 P1 (Everhart) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1964-08-23T04:28:19.128000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:16Z |
| Obs used |
40 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1964-10-14.0000000 |
| e |
0.99649619 |
| q (au) |
1.259279 |
| a (au) |
359.402401 |
| i (deg) |
67.969012 |
| Ω (om, deg) |
280.445182 |
| ω (w, deg) |
20.685810 |
| M (ma, deg) |
0.007495 |
等級
散乱 + 全体線形
$$
M_a = (5.997 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.997 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.998 |
| 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) |
| 2026-09-20 00:00 |
06:57:27.79 |
+15:35:25.7 |
HIP 33469 |
26.33 |
| 2026-09-20 12:00 |
06:57:28.18 |
+15:35:22.3 |
HIP 33469 |
26.39 |
| 2026-09-21 00:00 |
06:57:28.56 |
+15:35:18.8 |
HIP 33469 |
26.45 |
| 2026-09-21 12:00 |
06:57:28.92 |
+15:35:15.4 |
HIP 33469 |
26.51 |
| 2026-09-22 00:00 |
06:57:29.27 |
+15:35:12.0 |
HIP 33469 |
26.57 |
| 2026-09-22 12:00 |
06:57:29.61 |
+15:35:08.6 |
HIP 33469 |
26.63 |
| 2026-09-23 00:00 |
06:57:29.94 |
+15:35:05.2 |
HIP 33469 |
26.69 |
| 2026-09-23 12:00 |
06:57:30.26 |
+15:35:01.8 |
HIP 33469 |
26.75 |
| 2026-09-24 00:00 |
06:57:30.56 |
+15:34:58.4 |
HIP 33469 |
26.80 |
| 2026-09-24 12:00 |
06:57:30.86 |
+15:34:55.1 |
HIP 33469 |
26.86 |
| 2026-09-25 00:00 |
06:57:31.14 |
+15:34:51.7 |
HIP 33469 |
26.92 |
| 2026-09-25 12:00 |
06:57:31.40 |
+15:34:48.4 |
HIP 33469 |
26.98 |
| 2026-09-26 00:00 |
06:57:31.66 |
+15:34:45.1 |
HIP 33469 |
27.04 |
| 2026-09-26 12:00 |
06:57:31.91 |
+15:34:41.7 |
HIP 33469 |
27.09 |
| 2026-09-27 00:00 |
06:57:32.14 |
+15:34:38.4 |
HIP 33469 |
27.15 |
| 2026-09-27 12:00 |
06:57:32.36 |
+15:34:35.2 |
HIP 33469 |
27.21 |
| 2026-09-28 00:00 |
06:57:32.57 |
+15:34:31.9 |
HIP 33469 |
27.27 |
| 2026-09-28 12:00 |
06:57:32.76 |
+15:34:28.6 |
HIP 33469 |
27.32 |
| 2026-09-29 00:00 |
06:57:32.94 |
+15:34:25.4 |
HIP 33469 |
27.38 |
| 2026-09-29 12:00 |
06:57:33.12 |
+15:34:22.1 |
HIP 33469 |
27.44 |
| 2026-09-30 00:00 |
06:57:33.28 |
+15:34:18.9 |
HIP 33469 |
27.49 |
| 2026-09-30 12:00 |
06:57:33.42 |
+15:34:15.7 |
HIP 33469 |
27.55 |
| 2026-10-01 00:00 |
06:57:33.56 |
+15:34:12.5 |
HIP 33469 |
27.60 |
| 2026-10-01 12:00 |
06:57:33.68 |
+15:34:09.3 |
HIP 33469 |
27.66 |
| 2026-10-02 00:00 |
06:57:33.79 |
+15:34:06.2 |
HIP 33469 |
27.71 |
| 2026-10-02 12:00 |
06:57:33.89 |
+15:34:03.0 |
HIP 33469 |
27.76 |
| 2026-10-03 00:00 |
06:57:33.97 |
+15:34:00.0 |
HIP 33469 |
27.82 |
| 2026-10-03 12:00 |
06:57:34.04 |
+15:33:56.8 |
HIP 33469 |
27.87 |
| 2026-10-04 00:00 |
06:57:34.10 |
+15:33:53.7 |
HIP 33469 |
27.92 |
| 2026-10-04 12:00 |
06:57:34.15 |
+15:33:50.6 |
HIP 33469 |
27.98 |
| 2026-10-05 00:00 |
06:57:34.19 |
+15:33:47.5 |
HIP 33469 |
28.03 |
| 2026-10-05 12:00 |
06:57:34.21 |
+15:33:44.5 |
HIP 33469 |
28.08 |
| 2026-10-06 00:00 |
06:57:34.22 |
+15:33:41.5 |
HIP 33469 |
28.13 |
| 2026-10-06 12:00 |
06:57:34.22 |
+15:33:38.4 |
HIP 33469 |
28.18 |
| 2026-10-07 00:00 |
06:57:34.20 |
+15:33:35.4 |
HIP 33469 |
28.23 |
| 2026-10-07 12:00 |
06:57:34.18 |
+15:33:32.5 |
HIP 33469 |
28.28 |
| 2026-10-08 00:00 |
06:57:34.14 |
+15:33:29.5 |
HIP 33469 |
28.33 |
| 2026-10-08 12:00 |
06:57:34.08 |
+15:33:26.5 |
HIP 33469 |
28.37 |
| 2026-10-09 00:00 |
06:57:34.02 |
+15:33:23.6 |
HIP 33469 |
28.42 |
| 2026-10-09 12:00 |
06:57:33.94 |
+15:33:20.7 |
HIP 33469 |
28.47 |
| 2026-10-10 00:00 |
06:57:33.85 |
+15:33:17.8 |
HIP 33469 |
28.52 |
| 2026-10-10 12:00 |
06:57:33.75 |
+15:33:14.9 |
HIP 33469 |
28.56 |
| 2026-10-11 00:00 |
06:57:33.63 |
+15:33:12.1 |
HIP 33469 |
28.61 |