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) |
| 2026-07-29 00:00 |
13:08:43.31 |
-01:22:40.3 |
HIP 64000 |
41.83 |
| 2026-07-29 12:00 |
13:08:55.99 |
-01:23:48.2 |
HIP 64351 |
38.59 |
| 2026-07-30 00:00 |
13:09:08.78 |
-01:24:56.6 |
HIP 64351 |
35.22 |
| 2026-07-30 12:00 |
13:09:21.67 |
-01:26:05.7 |
HIP 64351 |
31.83 |
| 2026-07-31 00:00 |
13:09:34.68 |
-01:27:15.4 |
HIP 64351 |
28.41 |
| 2026-07-31 12:00 |
13:09:47.79 |
-01:28:25.7 |
HIP 64351 |
24.98 |
| 2026-08-01 00:00 |
13:10:01.02 |
-01:29:36.6 |
HIP 64351 |
21.53 |
| 2026-08-01 12:00 |
13:10:14.35 |
-01:30:48.0 |
HIP 64351 |
18.08 |
| 2026-08-02 00:00 |
13:10:27.78 |
-01:32:00.1 |
HIP 64351 |
14.65 |
| 2026-08-02 12:00 |
13:10:41.32 |
-01:33:12.7 |
HIP 64351 |
11.27 |
| 2026-08-03 00:00 |
13:10:54.97 |
-01:34:25.9 |
HIP 64351 |
8.05 |
| 2026-08-03 12:00 |
13:11:08.72 |
-01:35:39.7 |
HIP 64351 |
5.36 |
| 2026-08-04 00:00 |
13:11:22.57 |
-01:36:54.0 |
HIP 64351 |
4.40 |
| 2026-08-04 12:00 |
13:11:36.53 |
-01:38:08.9 |
HIP 64351 |
6.10 |
| 2026-08-05 00:00 |
13:11:50.59 |
-01:39:24.4 |
HIP 64351 |
9.11 |
| 2026-08-05 12:00 |
13:12:04.76 |
-01:40:40.4 |
HIP 64460 |
11.34 |
| 2026-08-06 00:00 |
13:12:19.02 |
-01:41:56.9 |
HIP 64460 |
7.58 |
| 2026-08-06 12:00 |
13:12:33.39 |
-01:43:14.0 |
HIP 64460 |
3.84 |
| 2026-08-07 00:00 |
13:12:47.86 |
-01:44:31.6 |
HIP 64460 |
1.10 |
| 2026-08-07 12:00 |
13:13:02.42 |
-01:45:49.8 |
HIP 64460 |
4.16 |
| 2026-08-08 00:00 |
13:13:17.09 |
-01:47:08.4 |
HIP 64460 |
7.99 |
| 2026-08-08 12:00 |
13:13:31.86 |
-01:48:27.6 |
HIP 64460 |
11.88 |
| 2026-08-09 00:00 |
13:13:46.72 |
-01:49:47.2 |
HIP 64460 |
15.81 |
| 2026-08-09 12:00 |
13:14:01.68 |
-01:51:07.4 |
HIP 64460 |
19.78 |
| 2026-08-10 00:00 |
13:14:16.74 |
-01:52:28.1 |
HIP 64674 |
17.81 |
| 2026-08-10 12:00 |
13:14:31.90 |
-01:53:49.3 |
HIP 64674 |
15.25 |
| 2026-08-11 00:00 |
13:14:47.15 |
-01:55:10.9 |
HIP 64674 |
13.42 |
| 2026-08-11 12:00 |
13:15:02.50 |
-01:56:33.1 |
HIP 64674 |
12.66 |
| 2026-08-12 00:00 |
13:15:17.94 |
-01:57:55.7 |
HIP 64674 |
13.19 |
| 2026-08-12 12:00 |
13:15:33.48 |
-01:59:18.7 |
HIP 64674 |
14.88 |
| 2026-08-13 00:00 |
13:15:49.11 |
-02:00:42.2 |
HIP 64674 |
17.42 |
| 2026-08-13 12:00 |
13:16:04.83 |
-02:02:06.2 |
HIP 64674 |
20.51 |
| 2026-08-14 00:00 |
13:16:20.64 |
-02:03:30.6 |
HIP 64674 |
23.95 |
| 2026-08-14 12:00 |
13:16:36.55 |
-02:04:55.5 |
HIP 64674 |
27.62 |
| 2026-08-15 00:00 |
13:16:52.55 |
-02:06:20.8 |
HIP 64674 |
31.45 |
| 2026-08-15 12:00 |
13:17:08.63 |
-02:07:46.5 |
HIP 64674 |
35.40 |
| 2026-08-16 00:00 |
13:17:24.81 |
-02:09:12.7 |
HIP 64963 |
32.00 |
| 2026-08-16 12:00 |
13:17:41.07 |
-02:10:39.2 |
HIP 64963 |
28.18 |
| 2026-08-17 00:00 |
13:17:57.42 |
-02:12:06.2 |
HIP 64963 |
24.49 |
| 2026-08-17 12:00 |
13:18:13.86 |
-02:13:33.5 |
HIP 64963 |
21.04 |
| 2026-08-18 00:00 |
13:18:30.38 |
-02:15:01.3 |
HIP 64963 |
17.97 |
| 2026-08-18 12:00 |
13:18:46.99 |
-02:16:29.4 |
HIP 64963 |
15.53 |
| 2026-08-19 00:00 |
13:19:03.69 |
-02:17:57.9 |
HIP 64963 |
14.08 |