メタデータ
| 項目 |
値 |
| Designation |
C/1899 S1 (Giacobini) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1899-09-15T08:49:19.871040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:57Z |
| Obs used |
36 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1899-10-29.0000000 |
| e |
1.00000000 |
| q (au) |
1.785616 |
| a (au) |
- |
| i (deg) |
76.948955 |
| Ω (om, deg) |
273.627412 |
| ω (w, deg) |
10.751760 |
| M (ma, deg) |
- |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-07-29 00:00 |
06:15:12.67 |
+25:30:05.0 |
HIP 29680 |
2.34 |
| 2026-07-29 12:00 |
06:15:13.44 |
+25:30:04.8 |
HIP 29680 |
2.41 |
| 2026-07-30 00:00 |
06:15:14.21 |
+25:30:04.6 |
HIP 29680 |
2.49 |
| 2026-07-30 12:00 |
06:15:14.98 |
+25:30:04.4 |
HIP 29680 |
2.57 |
| 2026-07-31 00:00 |
06:15:15.74 |
+25:30:04.2 |
HIP 29680 |
2.67 |
| 2026-07-31 12:00 |
06:15:16.49 |
+25:30:04.0 |
HIP 29680 |
2.77 |
| 2026-08-01 00:00 |
06:15:17.25 |
+25:30:03.9 |
HIP 29680 |
2.87 |
| 2026-08-01 12:00 |
06:15:17.99 |
+25:30:03.7 |
HIP 29680 |
2.98 |
| 2026-08-02 00:00 |
06:15:18.74 |
+25:30:03.5 |
HIP 29680 |
3.10 |
| 2026-08-02 12:00 |
06:15:19.48 |
+25:30:03.4 |
HIP 29680 |
3.22 |
| 2026-08-03 00:00 |
06:15:20.21 |
+25:30:03.2 |
HIP 29680 |
3.34 |
| 2026-08-03 12:00 |
06:15:20.94 |
+25:30:03.1 |
HIP 29680 |
3.47 |
| 2026-08-04 00:00 |
06:15:21.67 |
+25:30:02.9 |
HIP 29680 |
3.60 |
| 2026-08-04 12:00 |
06:15:22.39 |
+25:30:02.8 |
HIP 29680 |
3.73 |
| 2026-08-05 00:00 |
06:15:23.10 |
+25:30:02.6 |
HIP 29680 |
3.86 |
| 2026-08-05 12:00 |
06:15:23.81 |
+25:30:02.5 |
HIP 29680 |
4.00 |
| 2026-08-06 00:00 |
06:15:24.52 |
+25:30:02.4 |
HIP 29680 |
4.13 |
| 2026-08-06 12:00 |
06:15:25.22 |
+25:30:02.3 |
HIP 29680 |
4.26 |
| 2026-08-07 00:00 |
06:15:25.92 |
+25:30:02.2 |
HIP 29680 |
4.40 |
| 2026-08-07 12:00 |
06:15:26.61 |
+25:30:02.0 |
HIP 29680 |
4.54 |
| 2026-08-08 00:00 |
06:15:27.30 |
+25:30:01.9 |
HIP 29680 |
4.67 |
| 2026-08-08 12:00 |
06:15:27.98 |
+25:30:01.8 |
HIP 29680 |
4.81 |
| 2026-08-09 00:00 |
06:15:28.65 |
+25:30:01.7 |
HIP 29680 |
4.95 |
| 2026-08-09 12:00 |
06:15:29.33 |
+25:30:01.6 |
HIP 29680 |
5.08 |
| 2026-08-10 00:00 |
06:15:29.99 |
+25:30:01.5 |
HIP 29680 |
5.22 |
| 2026-08-10 12:00 |
06:15:30.65 |
+25:30:01.5 |
HIP 29680 |
5.36 |
| 2026-08-11 00:00 |
06:15:31.31 |
+25:30:01.4 |
HIP 29680 |
5.49 |
| 2026-08-11 12:00 |
06:15:31.96 |
+25:30:01.3 |
HIP 29680 |
5.63 |
| 2026-08-12 00:00 |
06:15:32.60 |
+25:30:01.2 |
HIP 29680 |
5.76 |
| 2026-08-12 12:00 |
06:15:33.24 |
+25:30:01.2 |
HIP 29680 |
5.89 |
| 2026-08-13 00:00 |
06:15:33.87 |
+25:30:01.1 |
HIP 29680 |
6.03 |
| 2026-08-13 12:00 |
06:15:34.50 |
+25:30:01.0 |
HIP 29680 |
6.16 |
| 2026-08-14 00:00 |
06:15:35.12 |
+25:30:01.0 |
HIP 29680 |
6.29 |
| 2026-08-14 12:00 |
06:15:35.74 |
+25:30:00.9 |
HIP 29680 |
6.42 |
| 2026-08-15 00:00 |
06:15:36.35 |
+25:30:00.9 |
HIP 29680 |
6.55 |
| 2026-08-15 12:00 |
06:15:36.95 |
+25:30:00.8 |
HIP 29680 |
6.68 |
| 2026-08-16 00:00 |
06:15:37.55 |
+25:30:00.8 |
HIP 29680 |
6.81 |
| 2026-08-16 12:00 |
06:15:38.14 |
+25:30:00.8 |
HIP 29680 |
6.94 |
| 2026-08-17 00:00 |
06:15:38.73 |
+25:30:00.8 |
HIP 29680 |
7.06 |
| 2026-08-17 12:00 |
06:15:39.31 |
+25:30:00.7 |
HIP 29680 |
7.19 |
| 2026-08-18 00:00 |
06:15:39.88 |
+25:30:00.7 |
HIP 29680 |
7.31 |
| 2026-08-18 12:00 |
06:15:40.45 |
+25:30:00.7 |
HIP 29680 |
7.43 |
| 2026-08-19 00:00 |
06:15:41.01 |
+25:30:00.7 |
HIP 29680 |
7.56 |