メタデータ
| 項目 |
値 |
| Designation |
408P/Novichonok-Gerke |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-09-28T03:15:49.726080Z |
| Orbit solution date (soln_date, UTC) |
2025-08-07T09:12:25Z |
| Obs used |
1766 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
14.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-04-10.0000000 |
| e |
0.27128556 |
| q (au) |
3.485699 |
| a (au) |
4.783355 |
| i (deg) |
19.235651 |
| Ω (om, deg) |
189.795782 |
| ω (w, deg) |
224.806417 |
| M (ma, deg) |
275.102372 |
等級
散乱 + 全体線形
$$
M_a = (6.529 + 5.520\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.529 |
| n |
5.520 |
| gf |
0.897 |
| gb |
-0.751 |
| k |
0.999 |
| δ90 |
6.494 |
| 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 |
| 2020-06-20 |
2021-08-29 |
+11.0167 |
-5.838 |
| 2021-08-29 |
2022-09-27 |
+2.6763 |
-1.360 |
| 2022-09-28 |
2025-07-23 |
-1.7436 |
+0.790 |
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) |
| 2026-09-20 00:00 |
13:39:20.68 |
-04:01:25.2 |
HIP 66675 |
15.23 |
| 2026-09-20 12:00 |
13:39:41.60 |
-04:03:06.8 |
HIP 66675 |
10.35 |
| 2026-09-21 00:00 |
13:40:02.57 |
-04:04:48.5 |
HIP 66675 |
6.54 |
| 2026-09-21 12:00 |
13:40:23.58 |
-04:06:30.1 |
HIP 66675 |
6.23 |
| 2026-09-22 00:00 |
13:40:44.63 |
-04:08:11.8 |
HIP 66675 |
9.78 |
| 2026-09-22 12:00 |
13:41:05.73 |
-04:09:53.6 |
HIP 66815 |
12.32 |
| 2026-09-23 00:00 |
13:41:26.87 |
-04:11:35.3 |
HIP 66815 |
10.60 |
| 2026-09-23 12:00 |
13:41:48.05 |
-04:13:17.0 |
HIP 66815 |
11.60 |
| 2026-09-24 00:00 |
13:42:09.27 |
-04:14:58.7 |
HIP 66815 |
14.78 |
| 2026-09-24 12:00 |
13:42:30.54 |
-04:16:40.4 |
HIP 66966 |
14.92 |
| 2026-09-25 00:00 |
13:42:51.84 |
-04:18:22.1 |
HIP 66966 |
9.79 |
| 2026-09-25 12:00 |
13:43:13.19 |
-04:20:03.7 |
HIP 66966 |
5.59 |
| 2026-09-26 00:00 |
13:43:34.58 |
-04:21:45.4 |
HIP 66966 |
5.39 |
| 2026-09-26 12:00 |
13:43:56.00 |
-04:23:27.0 |
HIP 66966 |
9.47 |
| 2026-09-27 00:00 |
13:44:17.46 |
-04:25:08.6 |
HIP 66966 |
14.60 |
| 2026-09-27 12:00 |
13:44:38.96 |
-04:26:50.1 |
HIP 67092 |
12.29 |
| 2026-09-28 00:00 |
13:45:00.50 |
-04:28:31.6 |
HIP 67092 |
8.77 |
| 2026-09-28 12:00 |
13:45:22.08 |
-04:30:13.1 |
HIP 67092 |
8.13 |
| 2026-09-29 00:00 |
13:45:43.69 |
-04:31:54.5 |
HIP 67092 |
10.91 |
| 2026-09-29 12:00 |
13:46:05.34 |
-04:33:35.9 |
HIP 67092 |
15.36 |
| 2026-09-30 00:00 |
13:46:27.02 |
-04:35:17.2 |
HIP 67209 |
17.40 |
| 2026-09-30 12:00 |
13:46:48.74 |
-04:36:58.4 |
HIP 67209 |
17.26 |
| 2026-10-01 00:00 |
13:47:10.50 |
-04:38:39.6 |
HIP 67209 |
18.91 |
| 2026-10-01 12:00 |
13:47:32.29 |
-04:40:20.7 |
HIP 67366 |
13.59 |
| 2026-10-02 00:00 |
13:47:54.11 |
-04:42:01.8 |
HIP 67366 |
7.99 |
| 2026-10-02 12:00 |
13:48:15.96 |
-04:43:42.7 |
HIP 67366 |
2.77 |
| 2026-10-03 00:00 |
13:48:37.85 |
-04:45:23.6 |
HIP 67366 |
4.07 |
| 2026-10-03 12:00 |
13:48:59.77 |
-04:47:04.4 |
HIP 67366 |
9.53 |
| 2026-10-04 00:00 |
13:49:21.73 |
-04:48:45.1 |
HIP 67366 |
15.18 |
| 2026-10-04 12:00 |
13:49:43.71 |
-04:50:25.7 |
HIP 67366 |
20.87 |
| 2026-10-05 00:00 |
13:50:05.73 |
-04:52:06.2 |
HIP 67366 |
26.59 |
| 2026-10-05 12:00 |
13:50:27.77 |
-04:53:46.6 |
HIP 67366 |
32.32 |
| 2026-10-06 00:00 |
13:50:49.84 |
-04:55:26.8 |
HIP 67741 |
27.67 |
| 2026-10-06 12:00 |
13:51:11.95 |
-04:57:07.0 |
HIP 67741 |
21.92 |
| 2026-10-07 00:00 |
13:51:34.08 |
-04:58:47.0 |
HIP 67741 |
16.17 |
| 2026-10-07 12:00 |
13:51:56.24 |
-05:00:26.9 |
HIP 67741 |
10.41 |
| 2026-10-08 00:00 |
13:52:18.42 |
-05:02:06.7 |
HIP 67741 |
4.68 |
| 2026-10-08 12:00 |
13:52:40.64 |
-05:03:46.3 |
HIP 67741 |
1.43 |
| 2026-10-09 00:00 |
13:53:02.88 |
-05:05:25.8 |
HIP 67741 |
7.00 |
| 2026-10-09 12:00 |
13:53:25.14 |
-05:07:05.1 |
HIP 67741 |
12.76 |
| 2026-10-10 00:00 |
13:53:47.43 |
-05:08:44.3 |
HIP 67741 |
18.54 |
| 2026-10-10 12:00 |
13:54:09.74 |
-05:10:23.3 |
HIP 67741 |
24.33 |
| 2026-10-11 00:00 |
13:54:32.07 |
-05:12:02.1 |
HIP 67741 |
30.13 |