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) |
| 2026-09-20 00:00 |
06:16:02.74 |
+25:30:09.2 |
HIP 29833 |
11.84 |
| 2026-09-20 12:00 |
06:16:02.83 |
+25:30:09.4 |
HIP 29833 |
11.82 |
| 2026-09-21 00:00 |
06:16:02.92 |
+25:30:09.7 |
HIP 29833 |
11.80 |
| 2026-09-21 12:00 |
06:16:03.00 |
+25:30:10.0 |
HIP 29833 |
11.78 |
| 2026-09-22 00:00 |
06:16:03.08 |
+25:30:10.2 |
HIP 29833 |
11.76 |
| 2026-09-22 12:00 |
06:16:03.14 |
+25:30:10.5 |
HIP 29833 |
11.75 |
| 2026-09-23 00:00 |
06:16:03.20 |
+25:30:10.8 |
HIP 29833 |
11.74 |
| 2026-09-23 12:00 |
06:16:03.25 |
+25:30:11.1 |
HIP 29833 |
11.73 |
| 2026-09-24 00:00 |
06:16:03.29 |
+25:30:11.3 |
HIP 29833 |
11.72 |
| 2026-09-24 12:00 |
06:16:03.32 |
+25:30:11.6 |
HIP 29833 |
11.71 |
| 2026-09-25 00:00 |
06:16:03.34 |
+25:30:11.9 |
HIP 29833 |
11.71 |
| 2026-09-25 12:00 |
06:16:03.36 |
+25:30:12.2 |
HIP 29833 |
11.70 |
| 2026-09-26 00:00 |
06:16:03.37 |
+25:30:12.5 |
HIP 29833 |
11.70 |
| 2026-09-26 12:00 |
06:16:03.37 |
+25:30:12.8 |
HIP 29833 |
11.70 |
| 2026-09-27 00:00 |
06:16:03.36 |
+25:30:13.1 |
HIP 29833 |
11.70 |
| 2026-09-27 12:00 |
06:16:03.35 |
+25:30:13.4 |
HIP 29833 |
11.71 |
| 2026-09-28 00:00 |
06:16:03.33 |
+25:30:13.7 |
HIP 29833 |
11.71 |
| 2026-09-28 12:00 |
06:16:03.30 |
+25:30:14.0 |
HIP 29833 |
11.72 |
| 2026-09-29 00:00 |
06:16:03.26 |
+25:30:14.4 |
HIP 29833 |
11.73 |
| 2026-09-29 12:00 |
06:16:03.21 |
+25:30:14.7 |
HIP 29833 |
11.74 |
| 2026-09-30 00:00 |
06:16:03.15 |
+25:30:15.0 |
HIP 29833 |
11.75 |
| 2026-09-30 12:00 |
06:16:03.09 |
+25:30:15.3 |
HIP 29833 |
11.76 |
| 2026-10-01 00:00 |
06:16:03.02 |
+25:30:15.7 |
HIP 29833 |
11.78 |
| 2026-10-01 12:00 |
06:16:02.94 |
+25:30:16.0 |
HIP 29833 |
11.80 |
| 2026-10-02 00:00 |
06:16:02.86 |
+25:30:16.3 |
HIP 29833 |
11.82 |
| 2026-10-02 12:00 |
06:16:02.76 |
+25:30:16.6 |
HIP 29833 |
11.84 |
| 2026-10-03 00:00 |
06:16:02.66 |
+25:30:17.0 |
HIP 29833 |
11.86 |
| 2026-10-03 12:00 |
06:16:02.55 |
+25:30:17.3 |
HIP 29833 |
11.89 |
| 2026-10-04 00:00 |
06:16:02.43 |
+25:30:17.7 |
HIP 29833 |
11.92 |
| 2026-10-04 12:00 |
06:16:02.30 |
+25:30:18.0 |
HIP 29833 |
11.94 |
| 2026-10-05 00:00 |
06:16:02.17 |
+25:30:18.4 |
HIP 29833 |
11.98 |
| 2026-10-05 12:00 |
06:16:02.02 |
+25:30:18.7 |
HIP 29833 |
12.01 |
| 2026-10-06 00:00 |
06:16:01.87 |
+25:30:19.1 |
HIP 29833 |
12.04 |
| 2026-10-06 12:00 |
06:16:01.71 |
+25:30:19.4 |
HIP 29833 |
12.08 |
| 2026-10-07 00:00 |
06:16:01.55 |
+25:30:19.8 |
HIP 29833 |
12.12 |
| 2026-10-07 12:00 |
06:16:01.37 |
+25:30:20.1 |
HIP 29680 |
12.10 |
| 2026-10-08 00:00 |
06:16:01.19 |
+25:30:20.5 |
HIP 29680 |
12.06 |
| 2026-10-08 12:00 |
06:16:01.00 |
+25:30:20.9 |
HIP 29680 |
12.02 |
| 2026-10-09 00:00 |
06:16:00.80 |
+25:30:21.2 |
HIP 29680 |
11.97 |
| 2026-10-09 12:00 |
06:16:00.59 |
+25:30:21.6 |
HIP 29680 |
11.93 |
| 2026-10-10 00:00 |
06:16:00.38 |
+25:30:22.0 |
HIP 29680 |
11.88 |
| 2026-10-10 12:00 |
06:16:00.16 |
+25:30:22.3 |
HIP 29680 |
11.84 |
| 2026-10-11 00:00 |
06:15:59.93 |
+25:30:22.7 |
HIP 29680 |
11.79 |