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) |
| 2026-06-01 00:00 |
12:59:20.97 |
-00:48:26.7 |
HIP 63309 |
19.82 |
| 2026-06-01 12:00 |
12:59:17.16 |
-00:47:43.7 |
HIP 63309 |
19.75 |
| 2026-06-02 00:00 |
12:59:13.51 |
-00:47:01.8 |
HIP 63309 |
19.75 |
| 2026-06-02 12:00 |
12:59:10.01 |
-00:46:21.1 |
HIP 63309 |
19.83 |
| 2026-06-03 00:00 |
12:59:06.67 |
-00:45:41.5 |
HIP 63309 |
19.97 |
| 2026-06-03 12:00 |
12:59:03.49 |
-00:45:03.2 |
HIP 63373 |
19.38 |
| 2026-06-04 00:00 |
12:59:00.46 |
-00:44:26.0 |
HIP 63373 |
18.82 |
| 2026-06-04 12:00 |
12:58:57.59 |
-00:43:50.0 |
HIP 63373 |
18.30 |
| 2026-06-05 00:00 |
12:58:54.87 |
-00:43:15.2 |
HIP 63373 |
17.83 |
| 2026-06-05 12:00 |
12:58:52.32 |
-00:42:41.6 |
HIP 63373 |
17.41 |
| 2026-06-06 00:00 |
12:58:49.92 |
-00:42:09.1 |
HIP 63373 |
17.03 |
| 2026-06-06 12:00 |
12:58:47.68 |
-00:41:37.9 |
HIP 63373 |
16.68 |
| 2026-06-07 00:00 |
12:58:45.59 |
-00:41:07.7 |
HIP 63373 |
16.37 |
| 2026-06-07 12:00 |
12:58:43.66 |
-00:40:38.8 |
HIP 63373 |
16.09 |
| 2026-06-08 00:00 |
12:58:41.89 |
-00:40:11.0 |
HIP 63373 |
15.83 |
| 2026-06-08 12:00 |
12:58:40.28 |
-00:39:44.4 |
HIP 63373 |
15.60 |
| 2026-06-09 00:00 |
12:58:38.83 |
-00:39:19.0 |
HIP 63373 |
15.38 |
| 2026-06-09 12:00 |
12:58:37.53 |
-00:38:54.7 |
HIP 63373 |
15.18 |
| 2026-06-10 00:00 |
12:58:36.40 |
-00:38:31.6 |
HIP 63373 |
15.00 |
| 2026-06-10 12:00 |
12:58:35.42 |
-00:38:09.7 |
HIP 63373 |
14.82 |
| 2026-06-11 00:00 |
12:58:34.60 |
-00:37:48.9 |
HIP 63373 |
14.64 |
| 2026-06-11 12:00 |
12:58:33.94 |
-00:37:29.2 |
HIP 63373 |
14.46 |
| 2026-06-12 00:00 |
12:58:33.43 |
-00:37:10.8 |
HIP 63373 |
14.29 |
| 2026-06-12 12:00 |
12:58:33.09 |
-00:36:53.4 |
HIP 63373 |
14.11 |
| 2026-06-13 00:00 |
12:58:32.90 |
-00:36:37.3 |
HIP 63373 |
13.93 |
| 2026-06-13 12:00 |
12:58:32.87 |
-00:36:22.3 |
HIP 63373 |
13.74 |
| 2026-06-14 00:00 |
12:58:33.00 |
-00:36:08.4 |
HIP 63373 |
13.54 |
| 2026-06-14 12:00 |
12:58:33.29 |
-00:35:55.6 |
HIP 63373 |
13.33 |
| 2026-06-15 00:00 |
12:58:33.74 |
-00:35:44.0 |
HIP 63373 |
13.11 |
| 2026-06-15 12:00 |
12:58:34.34 |
-00:35:33.6 |
HIP 63373 |
12.88 |
| 2026-06-16 00:00 |
12:58:35.10 |
-00:35:24.2 |
HIP 63373 |
12.63 |
| 2026-06-16 12:00 |
12:58:36.03 |
-00:35:16.0 |
HIP 63373 |
12.38 |
| 2026-06-17 00:00 |
12:58:37.10 |
-00:35:08.9 |
HIP 63373 |
12.12 |
| 2026-06-17 12:00 |
12:58:38.34 |
-00:35:03.0 |
HIP 63373 |
11.85 |
| 2026-06-18 00:00 |
12:58:39.73 |
-00:34:58.1 |
HIP 63373 |
11.58 |
| 2026-06-18 12:00 |
12:58:41.28 |
-00:34:54.3 |
HIP 63373 |
11.30 |
| 2026-06-19 00:00 |
12:58:42.99 |
-00:34:51.7 |
HIP 63373 |
11.02 |
| 2026-06-19 12:00 |
12:58:44.85 |
-00:34:50.1 |
HIP 63373 |
10.74 |
| 2026-06-20 00:00 |
12:58:46.87 |
-00:34:49.7 |
HIP 63373 |
10.48 |
| 2026-06-20 12:00 |
12:58:49.04 |
-00:34:50.3 |
HIP 63373 |
10.23 |
| 2026-06-21 00:00 |
12:58:51.37 |
-00:34:52.0 |
HIP 63373 |
10.01 |
| 2026-06-21 12:00 |
12:58:53.85 |
-00:34:54.8 |
HIP 63373 |
9.82 |
| 2026-06-22 00:00 |
12:58:56.49 |
-00:34:58.7 |
HIP 63373 |
9.68 |