메타데이터
| 항목 |
값 |
| Designation |
C/2016 R2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-05-09T13:59:38.526720Z |
| Orbit solution date (soln_date, UTC) |
2021-07-01T22:12:39Z |
| Obs used |
4319 |
| NEO |
- |
| M1 |
7.300 |
| K1 |
9.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-05-29.0000000 |
| e |
0.99630739 |
| q (au) |
2.602364 |
| a (au) |
704.748706 |
| i (deg) |
58.224063 |
| Ω (om, deg) |
80.569029 |
| ω (w, deg) |
33.191899 |
| M (ma, deg) |
0.001023 |
밝기
산란 + 전체 선형
$$
M_a = (11.078 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
11.078 |
| n |
2.000 |
| gf |
0.961 |
| gb |
-0.500 |
| k |
0.801 |
| δ90 |
1.413 |
| 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 |
| 2016-08-30 |
2017-12-27 |
-1.8441 |
+0.387 |
| 2017-12-27 |
2018-05-08 |
+20.4769 |
-9.982 |
| 2018-05-09 |
2021-06-27 |
+6.0712 |
-4.191 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
17:07:34.36 |
-15:11:53.1 |
HIP 83695 |
22.85 |
| 2026-05-12 12:00 |
17:07:29.07 |
-15:11:49.6 |
HIP 83695 |
21.92 |
| 2026-05-13 00:00 |
17:07:23.74 |
-15:11:46.2 |
HIP 83695 |
21.02 |
| 2026-05-13 12:00 |
17:07:18.40 |
-15:11:42.9 |
HIP 83695 |
20.16 |
| 2026-05-14 00:00 |
17:07:13.03 |
-15:11:39.6 |
HIP 83695 |
19.34 |
| 2026-05-14 12:00 |
17:07:07.64 |
-15:11:36.4 |
HIP 83695 |
18.57 |
| 2026-05-15 00:00 |
17:07:02.22 |
-15:11:33.2 |
HIP 83695 |
17.85 |
| 2026-05-15 12:00 |
17:06:56.78 |
-15:11:30.1 |
HIP 83695 |
17.21 |
| 2026-05-16 00:00 |
17:06:51.32 |
-15:11:27.0 |
HIP 83695 |
16.64 |
| 2026-05-16 12:00 |
17:06:45.84 |
-15:11:24.0 |
HIP 83695 |
16.15 |
| 2026-05-17 00:00 |
17:06:40.34 |
-15:11:21.1 |
HIP 83695 |
15.76 |
| 2026-05-17 12:00 |
17:06:34.81 |
-15:11:18.2 |
HIP 83695 |
15.47 |
| 2026-05-18 00:00 |
17:06:29.27 |
-15:11:15.4 |
HIP 83695 |
15.29 |
| 2026-05-18 12:00 |
17:06:23.71 |
-15:11:12.6 |
HIP 83695 |
15.22 |
| 2026-05-19 00:00 |
17:06:18.12 |
-15:11:09.9 |
HIP 83695 |
15.27 |
| 2026-05-19 12:00 |
17:06:12.52 |
-15:11:07.3 |
HIP 83695 |
15.44 |
| 2026-05-20 00:00 |
17:06:06.91 |
-15:11:04.8 |
HIP 83695 |
15.72 |
| 2026-05-20 12:00 |
17:06:01.27 |
-15:11:02.3 |
HIP 83588 |
14.88 |
| 2026-05-21 00:00 |
17:05:55.62 |
-15:10:59.9 |
HIP 83588 |
13.62 |
| 2026-05-21 12:00 |
17:05:49.95 |
-15:10:57.5 |
HIP 83588 |
12.37 |
| 2026-05-22 00:00 |
17:05:44.27 |
-15:10:55.2 |
HIP 83588 |
11.15 |
| 2026-05-22 12:00 |
17:05:38.57 |
-15:10:53.0 |
HIP 83588 |
9.97 |
| 2026-05-23 00:00 |
17:05:32.86 |
-15:10:50.9 |
HIP 83588 |
8.84 |
| 2026-05-23 12:00 |
17:05:27.13 |
-15:10:48.8 |
HIP 83588 |
7.78 |
| 2026-05-24 00:00 |
17:05:21.39 |
-15:10:46.8 |
HIP 83588 |
6.84 |
| 2026-05-24 12:00 |
17:05:15.63 |
-15:10:44.9 |
HIP 83588 |
6.07 |
| 2026-05-25 00:00 |
17:05:09.86 |
-15:10:43.1 |
HIP 83588 |
5.54 |
| 2026-05-25 12:00 |
17:05:04.08 |
-15:10:41.3 |
HIP 83588 |
5.34 |
| 2026-05-26 00:00 |
17:04:58.29 |
-15:10:39.6 |
HIP 83588 |
5.48 |
| 2026-05-26 12:00 |
17:04:52.49 |
-15:10:38.0 |
HIP 83588 |
5.97 |
| 2026-05-27 00:00 |
17:04:46.68 |
-15:10:36.4 |
HIP 83588 |
6.71 |
| 2026-05-27 12:00 |
17:04:40.85 |
-15:10:34.9 |
HIP 83588 |
7.65 |
| 2026-05-28 00:00 |
17:04:35.02 |
-15:10:33.5 |
HIP 83588 |
8.71 |
| 2026-05-28 12:00 |
17:04:29.18 |
-15:10:32.2 |
HIP 83588 |
9.86 |
| 2026-05-29 00:00 |
17:04:23.33 |
-15:10:31.0 |
HIP 83588 |
11.07 |
| 2026-05-29 12:00 |
17:04:17.47 |
-15:10:29.8 |
HIP 83588 |
12.32 |
| 2026-05-30 00:00 |
17:04:11.60 |
-15:10:28.7 |
HIP 83588 |
13.61 |
| 2026-05-30 12:00 |
17:04:05.72 |
-15:10:27.7 |
HIP 83588 |
14.92 |
| 2026-05-31 00:00 |
17:03:59.84 |
-15:10:26.8 |
HIP 83588 |
16.25 |
| 2026-05-31 12:00 |
17:03:53.95 |
-15:10:26.0 |
HIP 83588 |
17.60 |
| 2026-06-01 00:00 |
17:03:48.06 |
-15:10:25.2 |
HIP 83588 |
18.96 |
| 2026-06-01 12:00 |
17:03:42.16 |
-15:10:24.5 |
HIP 83588 |
20.32 |
| 2026-06-02 00:00 |
17:03:36.26 |
-15:10:23.9 |
HIP 83588 |
21.70 |