C/2017 E1 (Borisov)
메타데이터
| 항목 |
값 |
| Designation |
C/2017 E1 (Borisov) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-04-10T03:19:38.262720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:31Z |
| Obs used |
183 |
| NEO |
- |
| M1 |
14.000 |
| K1 |
32.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-03-16.0000000 |
| e |
1.00257425 |
| q (au) |
0.900663 |
| a (au) |
-349.874391 |
| i (deg) |
14.554152 |
| Ω (om, deg) |
142.732826 |
| ω (w, deg) |
152.473457 |
| M (ma, deg) |
-0.003786 |
밝기
산란 + 전체 선형
$$
M_a = (15.076 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
15.076 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2017-03-01 |
2017-04-09 |
+33.3745 |
-1.729 |
| 2017-04-13 |
2017-06-25 |
+5.0977 |
-3.546 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
06:05:45.86 |
+11:53:18.5 |
HIP 28850 |
11.68 |
| 2026-02-03 12:00 |
06:05:42.19 |
+11:53:30.6 |
HIP 28850 |
11.48 |
| 2026-02-04 00:00 |
06:05:38.57 |
+11:53:42.8 |
HIP 28850 |
11.36 |
| 2026-02-04 12:00 |
06:05:34.98 |
+11:53:55.0 |
HIP 28850 |
11.31 |
| 2026-02-05 00:00 |
06:05:31.42 |
+11:54:07.3 |
HIP 28850 |
11.33 |
| 2026-02-05 12:00 |
06:05:27.90 |
+11:54:19.7 |
HIP 28850 |
11.43 |
| 2026-02-06 00:00 |
06:05:24.41 |
+11:54:32.2 |
HIP 28850 |
11.60 |
| 2026-02-06 12:00 |
06:05:20.96 |
+11:54:44.8 |
HIP 28850 |
11.83 |
| 2026-02-07 00:00 |
06:05:17.55 |
+11:54:57.4 |
HIP 28850 |
12.12 |
| 2026-02-07 12:00 |
06:05:14.17 |
+11:55:10.2 |
HIP 28850 |
12.46 |
| 2026-02-08 00:00 |
06:05:10.83 |
+11:55:23.0 |
HIP 28850 |
12.84 |
| 2026-02-08 12:00 |
06:05:07.53 |
+11:55:35.9 |
HIP 28850 |
13.27 |
| 2026-02-09 00:00 |
06:05:04.26 |
+11:55:48.8 |
HIP 28850 |
13.74 |
| 2026-02-09 12:00 |
06:05:01.03 |
+11:56:01.8 |
HIP 28850 |
14.23 |
| 2026-02-10 00:00 |
06:04:57.84 |
+11:56:15.0 |
HIP 28850 |
14.75 |
| 2026-02-10 12:00 |
06:04:54.69 |
+11:56:28.1 |
HIP 28850 |
15.29 |
| 2026-02-11 00:00 |
06:04:51.58 |
+11:56:41.4 |
HIP 28850 |
15.86 |
| 2026-02-11 12:00 |
06:04:48.50 |
+11:56:54.7 |
HIP 28850 |
16.43 |
| 2026-02-12 00:00 |
06:04:45.47 |
+11:57:08.1 |
HIP 28850 |
17.02 |
| 2026-02-12 12:00 |
06:04:42.47 |
+11:57:21.6 |
HIP 28850 |
17.62 |
| 2026-02-13 00:00 |
06:04:39.51 |
+11:57:35.1 |
HIP 28850 |
18.22 |
| 2026-02-13 12:00 |
06:04:36.59 |
+11:57:48.7 |
HIP 28850 |
18.84 |
| 2026-02-14 00:00 |
06:04:33.72 |
+11:58:02.3 |
HIP 28850 |
19.45 |
| 2026-02-14 12:00 |
06:04:30.88 |
+11:58:16.1 |
HIP 28850 |
20.07 |
| 2026-02-15 00:00 |
06:04:28.08 |
+11:58:29.8 |
HIP 28850 |
20.69 |
| 2026-02-15 12:00 |
06:04:25.32 |
+11:58:43.7 |
HIP 28850 |
21.31 |
| 2026-02-16 00:00 |
06:04:22.61 |
+11:58:57.6 |
HIP 28850 |
21.93 |
| 2026-02-16 12:00 |
06:04:19.93 |
+11:59:11.6 |
HIP 28850 |
22.55 |
| 2026-02-17 00:00 |
06:04:17.30 |
+11:59:25.6 |
HIP 28686 |
22.58 |
| 2026-02-17 12:00 |
06:04:14.71 |
+11:59:39.7 |
HIP 28686 |
22.42 |
| 2026-02-18 00:00 |
06:04:12.15 |
+11:59:53.8 |
HIP 28686 |
22.28 |
| 2026-02-18 12:00 |
06:04:09.64 |
+12:00:08.0 |
HIP 28686 |
22.18 |
| 2026-02-19 00:00 |
06:04:07.18 |
+12:00:22.2 |
HIP 28686 |
22.09 |
| 2026-02-19 12:00 |
06:04:04.75 |
+12:00:36.5 |
HIP 28686 |
22.03 |
| 2026-02-20 00:00 |
06:04:02.37 |
+12:00:50.9 |
HIP 28686 |
22.00 |
| 2026-02-20 12:00 |
06:04:00.03 |
+12:01:05.3 |
HIP 28686 |
21.99 |
| 2026-02-21 00:00 |
06:03:57.73 |
+12:01:19.7 |
HIP 28686 |
22.00 |
| 2026-02-21 12:00 |
06:03:55.48 |
+12:01:34.2 |
HIP 28686 |
22.03 |
| 2026-02-22 00:00 |
06:03:53.26 |
+12:01:48.8 |
HIP 28686 |
22.08 |
| 2026-02-22 12:00 |
06:03:51.09 |
+12:02:03.3 |
HIP 28686 |
22.15 |
| 2026-02-23 00:00 |
06:03:48.97 |
+12:02:18.0 |
HIP 28686 |
22.24 |
| 2026-02-23 12:00 |
06:03:46.89 |
+12:02:32.6 |
HIP 28686 |
22.34 |
| 2026-02-24 00:00 |
06:03:44.85 |
+12:02:47.4 |
HIP 28686 |
22.47 |