440P/Kobayashi
メタデータ
| 項目 |
値 |
| Designation |
440P/Kobayashi |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-03-26T11:34:50.255040Z |
| Orbit solution date (soln_date, UTC) |
2024-07-07T00:42:22Z |
| Obs used |
829 |
| NEO |
- |
| M1 |
7.400 |
| K1 |
32.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-11-01.0000000 |
| e |
0.76109197 |
| q (au) |
2.046559 |
| a (au) |
8.566304 |
| i (deg) |
12.379964 |
| Ω (om, deg) |
329.032199 |
| ω (w, deg) |
183.293142 |
| M (ma, deg) |
253.762760 |
等級
散乱 + 全体線形
$$
M_a = (12.175 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.175 |
| n |
6.000 |
| gf |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2021-12-08 |
2022-03-26 |
+29.4009 |
-9.339 |
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 |
20:09:26.43 |
-26:11:00.7 |
HIP 99273 |
5.34 |
| 2026-02-03 12:00 |
20:09:40.82 |
-26:10:16.8 |
HIP 99273 |
8.59 |
| 2026-02-04 00:00 |
20:09:55.18 |
-26:09:33.1 |
HIP 99273 |
11.87 |
| 2026-02-04 12:00 |
20:10:09.51 |
-26:08:49.5 |
HIP 99273 |
15.15 |
| 2026-02-05 00:00 |
20:10:23.81 |
-26:08:06.1 |
HIP 99273 |
18.43 |
| 2026-02-05 12:00 |
20:10:38.07 |
-26:07:22.8 |
HIP 99273 |
21.70 |
| 2026-02-06 00:00 |
20:10:52.31 |
-26:06:39.6 |
HIP 99536 |
21.82 |
| 2026-02-06 12:00 |
20:11:06.52 |
-26:05:56.6 |
HIP 99536 |
20.20 |
| 2026-02-07 00:00 |
20:11:20.69 |
-26:05:13.8 |
HIP 99536 |
19.01 |
| 2026-02-07 12:00 |
20:11:34.83 |
-26:04:31.1 |
HIP 99536 |
18.33 |
| 2026-02-08 00:00 |
20:11:48.94 |
-26:03:48.5 |
HIP 99613 |
16.87 |
| 2026-02-08 12:00 |
20:12:03.01 |
-26:03:06.1 |
HIP 99613 |
14.52 |
| 2026-02-09 00:00 |
20:12:17.05 |
-26:02:23.9 |
HIP 99613 |
12.58 |
| 2026-02-09 12:00 |
20:12:31.06 |
-26:01:41.9 |
HIP 99613 |
11.24 |
| 2026-02-10 00:00 |
20:12:45.02 |
-26:01:00.0 |
HIP 99613 |
10.73 |
| 2026-02-10 12:00 |
20:12:58.95 |
-26:00:18.2 |
HIP 99613 |
11.16 |
| 2026-02-11 00:00 |
20:13:12.85 |
-25:59:36.6 |
HIP 99613 |
12.42 |
| 2026-02-11 12:00 |
20:13:26.70 |
-25:58:55.2 |
HIP 99613 |
14.30 |
| 2026-02-12 00:00 |
20:13:40.52 |
-25:58:14.0 |
HIP 99613 |
16.57 |
| 2026-02-12 12:00 |
20:13:54.30 |
-25:57:33.0 |
HIP 99613 |
19.09 |
| 2026-02-13 00:00 |
20:14:08.04 |
-25:56:52.1 |
HIP 99613 |
21.78 |
| 2026-02-13 12:00 |
20:14:21.74 |
-25:56:11.4 |
HIP 99613 |
24.57 |
| 2026-02-14 00:00 |
20:14:35.40 |
-25:55:30.9 |
HIP 99613 |
27.43 |
| 2026-02-14 12:00 |
20:14:49.01 |
-25:54:50.6 |
HIP 99937 |
26.67 |
| 2026-02-15 00:00 |
20:15:02.58 |
-25:54:10.4 |
HIP 99937 |
23.61 |
| 2026-02-15 12:00 |
20:15:16.11 |
-25:53:30.5 |
HIP 99937 |
20.57 |
| 2026-02-16 00:00 |
20:15:29.60 |
-25:52:50.7 |
HIP 99937 |
17.58 |
| 2026-02-16 12:00 |
20:15:43.04 |
-25:52:11.2 |
HIP 99937 |
14.64 |
| 2026-02-17 00:00 |
20:15:56.44 |
-25:51:31.8 |
HIP 99937 |
11.79 |
| 2026-02-17 12:00 |
20:16:09.79 |
-25:50:52.6 |
HIP 99937 |
9.11 |
| 2026-02-18 00:00 |
20:16:23.10 |
-25:50:13.6 |
HIP 99937 |
6.78 |
| 2026-02-18 12:00 |
20:16:36.36 |
-25:49:34.9 |
HIP 99937 |
5.26 |
| 2026-02-19 00:00 |
20:16:49.57 |
-25:48:56.3 |
HIP 99937 |
5.30 |
| 2026-02-19 12:00 |
20:17:02.73 |
-25:48:18.0 |
HIP 99937 |
6.85 |
| 2026-02-20 00:00 |
20:17:15.84 |
-25:47:39.8 |
HIP 99937 |
9.16 |
| 2026-02-20 12:00 |
20:17:28.91 |
-25:47:01.9 |
HIP 100038 |
11.67 |
| 2026-02-21 00:00 |
20:17:41.92 |
-25:46:24.2 |
HIP 100038 |
11.77 |
| 2026-02-21 12:00 |
20:17:54.88 |
-25:45:46.7 |
HIP 100038 |
12.60 |
| 2026-02-22 00:00 |
20:18:07.79 |
-25:45:09.5 |
HIP 100038 |
14.02 |
| 2026-02-22 12:00 |
20:18:20.65 |
-25:44:32.4 |
HIP 100038 |
15.87 |
| 2026-02-23 00:00 |
20:18:33.46 |
-25:43:55.6 |
HIP 100038 |
18.00 |
| 2026-02-23 12:00 |
20:18:46.22 |
-25:43:19.0 |
HIP 100038 |
20.33 |
| 2026-02-24 00:00 |
20:18:58.92 |
-25:42:42.6 |
HIP 100038 |
22.79 |