メタデータ
| 項目 |
値 |
| Designation |
C/1961 R1 (Humason) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1962-12-10T05:16:13.828800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:14Z |
| Obs used |
80 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1963-05-12.0000000 |
| e |
0.98961410 |
| q (au) |
2.133470 |
| a (au) |
205.419821 |
| i (deg) |
153.277926 |
| Ω (om, deg) |
155.439541 |
| ω (w, deg) |
233.562038 |
| M (ma, deg) |
0.051146 |
等級
散乱 + 全体線形
$$
M_a = (0.444 + 5.517\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
0.444 |
| n |
5.517 |
| gf |
1.000 |
| gb |
-0.889 |
| k |
0.999 |
| δ90 |
9.971 |
| 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 |
| 1961-09-06 |
1962-12-03 |
+0.4530 |
-0.051 |
| 1963-01-24 |
1965-04-30 |
+1.2589 |
+0.904 |
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) |
| 2026-03-26 00:00 |
08:28:20.13 |
+35:25:17.9 |
HIP 41554 |
24.27 |
| 2026-03-26 12:00 |
08:28:19.23 |
+35:25:15.5 |
HIP 41554 |
24.23 |
| 2026-03-27 00:00 |
08:28:18.34 |
+35:25:13.0 |
HIP 41554 |
24.20 |
| 2026-03-27 12:00 |
08:28:17.47 |
+35:25:10.5 |
HIP 41554 |
24.16 |
| 2026-03-28 00:00 |
08:28:16.61 |
+35:25:07.9 |
HIP 41554 |
24.13 |
| 2026-03-28 12:00 |
08:28:15.76 |
+35:25:05.2 |
HIP 41554 |
24.09 |
| 2026-03-29 00:00 |
08:28:14.93 |
+35:25:02.5 |
HIP 41554 |
24.06 |
| 2026-03-29 12:00 |
08:28:14.11 |
+35:24:59.7 |
HIP 41554 |
24.03 |
| 2026-03-30 00:00 |
08:28:13.30 |
+35:24:56.8 |
HIP 41554 |
23.99 |
| 2026-03-30 12:00 |
08:28:12.50 |
+35:24:53.9 |
HIP 41554 |
23.96 |
| 2026-03-31 00:00 |
08:28:11.72 |
+35:24:50.9 |
HIP 41554 |
23.92 |
| 2026-03-31 12:00 |
08:28:10.96 |
+35:24:47.9 |
HIP 41554 |
23.89 |
| 2026-04-01 00:00 |
08:28:10.20 |
+35:24:44.8 |
HIP 41554 |
23.85 |
| 2026-04-01 12:00 |
08:28:09.46 |
+35:24:41.7 |
HIP 41554 |
23.82 |
| 2026-04-02 00:00 |
08:28:08.74 |
+35:24:38.5 |
HIP 41554 |
23.78 |
| 2026-04-02 12:00 |
08:28:08.02 |
+35:24:35.2 |
HIP 41554 |
23.75 |
| 2026-04-03 00:00 |
08:28:07.32 |
+35:24:31.9 |
HIP 41554 |
23.71 |
| 2026-04-03 12:00 |
08:28:06.64 |
+35:24:28.5 |
HIP 41554 |
23.67 |
| 2026-04-04 00:00 |
08:28:05.97 |
+35:24:25.0 |
HIP 41554 |
23.63 |
| 2026-04-04 12:00 |
08:28:05.31 |
+35:24:21.5 |
HIP 41554 |
23.60 |
| 2026-04-05 00:00 |
08:28:04.66 |
+35:24:18.0 |
HIP 41554 |
23.56 |
| 2026-04-05 12:00 |
08:28:04.03 |
+35:24:14.4 |
HIP 41554 |
23.52 |
| 2026-04-06 00:00 |
08:28:03.42 |
+35:24:10.7 |
HIP 41554 |
23.48 |
| 2026-04-06 12:00 |
08:28:02.82 |
+35:24:07.0 |
HIP 41554 |
23.44 |
| 2026-04-07 00:00 |
08:28:02.23 |
+35:24:03.2 |
HIP 41554 |
23.40 |
| 2026-04-07 12:00 |
08:28:01.65 |
+35:23:59.3 |
HIP 41554 |
23.36 |
| 2026-04-08 00:00 |
08:28:01.09 |
+35:23:55.4 |
HIP 41554 |
23.32 |
| 2026-04-08 12:00 |
08:28:00.55 |
+35:23:51.5 |
HIP 41554 |
23.27 |
| 2026-04-09 00:00 |
08:28:00.01 |
+35:23:47.5 |
HIP 41554 |
23.23 |
| 2026-04-09 12:00 |
08:27:59.50 |
+35:23:43.4 |
HIP 41554 |
23.18 |
| 2026-04-10 00:00 |
08:27:58.99 |
+35:23:39.3 |
HIP 41554 |
23.14 |
| 2026-04-10 12:00 |
08:27:58.50 |
+35:23:35.2 |
HIP 41554 |
23.09 |
| 2026-04-11 00:00 |
08:27:58.03 |
+35:23:30.9 |
HIP 41554 |
23.05 |
| 2026-04-11 12:00 |
08:27:57.57 |
+35:23:26.7 |
HIP 41554 |
23.00 |
| 2026-04-12 00:00 |
08:27:57.12 |
+35:23:22.3 |
HIP 41554 |
22.95 |
| 2026-04-12 12:00 |
08:27:56.69 |
+35:23:18.0 |
HIP 41554 |
22.90 |
| 2026-04-13 00:00 |
08:27:56.27 |
+35:23:13.6 |
HIP 41554 |
22.85 |
| 2026-04-13 12:00 |
08:27:55.87 |
+35:23:09.1 |
HIP 41554 |
22.79 |
| 2026-04-14 00:00 |
08:27:55.48 |
+35:23:04.5 |
HIP 41554 |
22.74 |
| 2026-04-14 12:00 |
08:27:55.10 |
+35:23:00.0 |
HIP 41554 |
22.68 |
| 2026-04-15 00:00 |
08:27:54.74 |
+35:22:55.3 |
HIP 41554 |
22.63 |
| 2026-04-15 12:00 |
08:27:54.40 |
+35:22:50.7 |
HIP 41554 |
22.57 |
| 2026-04-16 00:00 |
08:27:54.07 |
+35:22:45.9 |
HIP 41554 |
22.51 |