메타데이터
| 항목 |
값 |
| Designation |
C/1947 F2 (Becvar) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1947-05-03T21:55:11.012160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:07Z |
| Obs used |
23 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1947-04-14.0000000 |
| e |
1.00000000 |
| q (au) |
0.961893 |
| a (au) |
- |
| i (deg) |
129.171903 |
| Ω (om, deg) |
323.060604 |
| ω (w, deg) |
182.120598 |
| M (ma, deg) |
- |
밝기
산란 + 전체 선형
$$
M_a = (10.618 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.618 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
22:14:22.85 |
-18:21:01.9 |
HIP 109918 |
22.98 |
| 2026-07-29 12:00 |
22:14:21.81 |
-18:21:08.2 |
HIP 109918 |
23.25 |
| 2026-07-30 00:00 |
22:14:20.76 |
-18:21:14.6 |
HIP 109918 |
23.51 |
| 2026-07-30 12:00 |
22:14:19.72 |
-18:21:21.0 |
HIP 109918 |
23.78 |
| 2026-07-31 00:00 |
22:14:18.66 |
-18:21:27.3 |
HIP 109918 |
24.05 |
| 2026-07-31 12:00 |
22:14:17.61 |
-18:21:33.7 |
HIP 109918 |
24.32 |
| 2026-08-01 00:00 |
22:14:16.54 |
-18:21:40.1 |
HIP 109918 |
24.59 |
| 2026-08-01 12:00 |
22:14:15.48 |
-18:21:46.5 |
HIP 109918 |
24.86 |
| 2026-08-02 00:00 |
22:14:14.41 |
-18:21:52.9 |
HIP 109918 |
25.13 |
| 2026-08-02 12:00 |
22:14:13.34 |
-18:21:59.3 |
HIP 109918 |
25.40 |
| 2026-08-03 00:00 |
22:14:12.26 |
-18:22:05.6 |
HIP 109918 |
25.68 |
| 2026-08-03 12:00 |
22:14:11.18 |
-18:22:12.0 |
HIP 109918 |
25.95 |
| 2026-08-04 00:00 |
22:14:10.10 |
-18:22:18.4 |
HIP 109918 |
26.22 |
| 2026-08-04 12:00 |
22:14:09.01 |
-18:22:24.8 |
HIP 109918 |
26.50 |
| 2026-08-05 00:00 |
22:14:07.93 |
-18:22:31.2 |
HIP 109918 |
26.78 |
| 2026-08-05 12:00 |
22:14:06.83 |
-18:22:37.6 |
HIP 109918 |
27.05 |
| 2026-08-06 00:00 |
22:14:05.74 |
-18:22:44.0 |
HIP 109918 |
27.33 |
| 2026-08-06 12:00 |
22:14:04.64 |
-18:22:50.4 |
HIP 109918 |
27.61 |
| 2026-08-07 00:00 |
22:14:03.53 |
-18:22:56.8 |
HIP 109918 |
27.89 |
| 2026-08-07 12:00 |
22:14:02.43 |
-18:23:03.2 |
HIP 109918 |
28.17 |
| 2026-08-08 00:00 |
22:14:01.32 |
-18:23:09.5 |
HIP 109918 |
28.45 |
| 2026-08-08 12:00 |
22:14:00.21 |
-18:23:15.9 |
HIP 109918 |
28.73 |
| 2026-08-09 00:00 |
22:13:59.10 |
-18:23:22.3 |
HIP 109918 |
29.01 |
| 2026-08-09 12:00 |
22:13:57.98 |
-18:23:28.7 |
HIP 109918 |
29.29 |
| 2026-08-10 00:00 |
22:13:56.86 |
-18:23:35.0 |
HIP 109918 |
29.58 |
| 2026-08-10 12:00 |
22:13:55.74 |
-18:23:41.4 |
HIP 109634 |
29.52 |
| 2026-08-11 00:00 |
22:13:54.62 |
-18:23:47.7 |
HIP 109634 |
29.43 |
| 2026-08-11 12:00 |
22:13:53.49 |
-18:23:54.1 |
HIP 109634 |
29.33 |
| 2026-08-12 00:00 |
22:13:52.36 |
-18:24:00.4 |
HIP 109634 |
29.24 |
| 2026-08-12 12:00 |
22:13:51.23 |
-18:24:06.8 |
HIP 109634 |
29.15 |
| 2026-08-13 00:00 |
22:13:50.10 |
-18:24:13.1 |
HIP 109634 |
29.06 |
| 2026-08-13 12:00 |
22:13:48.96 |
-18:24:19.4 |
HIP 109634 |
28.97 |
| 2026-08-14 00:00 |
22:13:47.83 |
-18:24:25.7 |
HIP 109634 |
28.89 |
| 2026-08-14 12:00 |
22:13:46.69 |
-18:24:32.0 |
HIP 109634 |
28.81 |
| 2026-08-15 00:00 |
22:13:45.55 |
-18:24:38.3 |
HIP 109634 |
28.73 |
| 2026-08-15 12:00 |
22:13:44.41 |
-18:24:44.6 |
HIP 109634 |
28.65 |
| 2026-08-16 00:00 |
22:13:43.27 |
-18:24:50.8 |
HIP 109634 |
28.57 |
| 2026-08-16 12:00 |
22:13:42.12 |
-18:24:57.1 |
HIP 109634 |
28.50 |
| 2026-08-17 00:00 |
22:13:40.98 |
-18:25:03.3 |
HIP 109634 |
28.43 |
| 2026-08-17 12:00 |
22:13:39.83 |
-18:25:09.5 |
HIP 109634 |
28.36 |
| 2026-08-18 00:00 |
22:13:38.68 |
-18:25:15.8 |
HIP 109634 |
28.30 |
| 2026-08-18 12:00 |
22:13:37.53 |
-18:25:21.9 |
HIP 109634 |
28.24 |
| 2026-08-19 00:00 |
22:13:36.38 |
-18:25:28.1 |
HIP 109634 |
28.18 |