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) |
| 2026-05-12 00:00 |
22:15:37.88 |
-18:09:59.3 |
HIP 109918 |
2.04 |
| 2026-05-12 12:00 |
22:15:38.09 |
-18:10:00.2 |
HIP 109918 |
2.02 |
| 2026-05-13 00:00 |
22:15:38.29 |
-18:10:01.1 |
HIP 109918 |
1.99 |
| 2026-05-13 12:00 |
22:15:38.48 |
-18:10:02.0 |
HIP 109918 |
1.97 |
| 2026-05-14 00:00 |
22:15:38.66 |
-18:10:03.0 |
HIP 109918 |
1.95 |
| 2026-05-14 12:00 |
22:15:38.83 |
-18:10:04.1 |
HIP 109918 |
1.94 |
| 2026-05-15 00:00 |
22:15:39.00 |
-18:10:05.2 |
HIP 109918 |
1.92 |
| 2026-05-15 12:00 |
22:15:39.15 |
-18:10:06.4 |
HIP 109918 |
1.91 |
| 2026-05-16 00:00 |
22:15:39.29 |
-18:10:07.6 |
HIP 109918 |
1.91 |
| 2026-05-16 12:00 |
22:15:39.42 |
-18:10:08.9 |
HIP 109918 |
1.90 |
| 2026-05-17 00:00 |
22:15:39.55 |
-18:10:10.2 |
HIP 109918 |
1.90 |
| 2026-05-17 12:00 |
22:15:39.66 |
-18:10:11.6 |
HIP 109918 |
1.91 |
| 2026-05-18 00:00 |
22:15:39.76 |
-18:10:13.1 |
HIP 109918 |
1.91 |
| 2026-05-18 12:00 |
22:15:39.86 |
-18:10:14.5 |
HIP 109918 |
1.92 |
| 2026-05-19 00:00 |
22:15:39.94 |
-18:10:16.1 |
HIP 109918 |
1.93 |
| 2026-05-19 12:00 |
22:15:40.02 |
-18:10:17.7 |
HIP 109918 |
1.94 |
| 2026-05-20 00:00 |
22:15:40.09 |
-18:10:19.4 |
HIP 109918 |
1.96 |
| 2026-05-20 12:00 |
22:15:40.14 |
-18:10:21.1 |
HIP 109918 |
1.97 |
| 2026-05-21 00:00 |
22:15:40.19 |
-18:10:22.8 |
HIP 109918 |
1.99 |
| 2026-05-21 12:00 |
22:15:40.23 |
-18:10:24.7 |
HIP 109918 |
2.02 |
| 2026-05-22 00:00 |
22:15:40.25 |
-18:10:26.5 |
HIP 109918 |
2.04 |
| 2026-05-22 12:00 |
22:15:40.27 |
-18:10:28.5 |
HIP 109918 |
2.07 |
| 2026-05-23 00:00 |
22:15:40.28 |
-18:10:30.4 |
HIP 109918 |
2.09 |
| 2026-05-23 12:00 |
22:15:40.28 |
-18:10:32.5 |
HIP 109918 |
2.12 |
| 2026-05-24 00:00 |
22:15:40.27 |
-18:10:34.5 |
HIP 109918 |
2.16 |
| 2026-05-24 12:00 |
22:15:40.25 |
-18:10:36.7 |
HIP 109918 |
2.19 |
| 2026-05-25 00:00 |
22:15:40.22 |
-18:10:38.8 |
HIP 109918 |
2.22 |
| 2026-05-25 12:00 |
22:15:40.18 |
-18:10:41.1 |
HIP 109918 |
2.26 |
| 2026-05-26 00:00 |
22:15:40.13 |
-18:10:43.4 |
HIP 109918 |
2.30 |
| 2026-05-26 12:00 |
22:15:40.07 |
-18:10:45.7 |
HIP 109918 |
2.34 |
| 2026-05-27 00:00 |
22:15:40.00 |
-18:10:48.1 |
HIP 109918 |
2.39 |
| 2026-05-27 12:00 |
22:15:39.92 |
-18:10:50.5 |
HIP 109918 |
2.43 |
| 2026-05-28 00:00 |
22:15:39.83 |
-18:10:53.0 |
HIP 109918 |
2.48 |
| 2026-05-28 12:00 |
22:15:39.74 |
-18:10:55.6 |
HIP 109918 |
2.52 |
| 2026-05-29 00:00 |
22:15:39.63 |
-18:10:58.1 |
HIP 109918 |
2.57 |
| 2026-05-29 12:00 |
22:15:39.51 |
-18:11:00.8 |
HIP 109918 |
2.63 |
| 2026-05-30 00:00 |
22:15:39.39 |
-18:11:03.5 |
HIP 109918 |
2.68 |
| 2026-05-30 12:00 |
22:15:39.25 |
-18:11:06.2 |
HIP 109918 |
2.74 |
| 2026-05-31 00:00 |
22:15:39.11 |
-18:11:09.0 |
HIP 109918 |
2.79 |
| 2026-05-31 12:00 |
22:15:38.95 |
-18:11:11.8 |
HIP 109918 |
2.85 |
| 2026-06-01 00:00 |
22:15:38.79 |
-18:11:14.7 |
HIP 109918 |
2.91 |
| 2026-06-01 12:00 |
22:15:38.62 |
-18:11:17.7 |
HIP 109918 |
2.97 |
| 2026-06-02 00:00 |
22:15:38.43 |
-18:11:20.6 |
HIP 109918 |
3.04 |