diff --git a/config.defaults.yaml b/config.defaults.yaml
index a4630d1f..9ade4f73 100644
--- a/config.defaults.yaml
+++ b/config.defaults.yaml
@@ -86,6 +86,18 @@ docs:
     flaring_mdwarf:
       coordinates: [103.289525, 10.194726]
       title: M dwarf (Flaring)
+    cv_U_Gem:
+      coordinates: [18.884181, 37.626534]
+      title: Cataclysmic variable (U Gem dwarf nova)
+    cv_Z_Cam:
+      coordinates: [269.093260, 2.967803]
+      title: Cataclysmic variable (Z Cam dwarf nova)
+    cv_SU_UMa:
+      coordinates: [170.883476, 43.288214]
+      title: Cataclysmic variable (SU UMa/WZ Sge dwarf nova)
+    cv_Novalike:
+      coordinates: [322.961689, 49.233813]
+      title: Cataclysmic variable (Novalike)
     mira:
       coordinates: [9.1523, 68.0221]
       period: 212.0066035
@@ -93,3 +105,27 @@ docs:
     srv:
       coordinates: [330.302266, 66.153712]
       title: Semi Regular Variable
+    yso_sinusoidal:
+      coordinates: [313.30835,44.21604]
+      title: YSO Sinusoidal
+    yso_quasi-periodic:
+      coordinates: [313.42558,44.44825]
+      title: YSO quasi-periodic
+    yso_stochastic:
+      coordinates: [313.364708,44.10261]
+      title: YSO stochastic
+    yso_burster:
+      coordinates: [313.31515,43.73967]
+      title: YSO burster
+    yso_outburster:
+      coordinates: [301.2751339,  36.4870689]
+      title: YSO outburster
+    yso_dipper:
+      coordinates: [313.417297,44.17929]
+      title: YSO dipper
+    yso_fader:
+      coordinates: [312.85172,44.217837]
+      title: YSO fader
+    yso_longterm-drifter:
+      coordinates: [314.57094,43.89535]
+      title: YSO longterm-drifter
diff --git a/data/golden/yso.csv b/data/golden/yso.csv
new file mode 100644
index 00000000..f1ca321f
--- /dev/null
+++ b/data/golden/yso.csv
@@ -0,0 +1,101 @@
+ra,dec
+312.7099655363757,44.836540725881186
+313.49350340688306,44.54305795713624
+313.3430529515253,44.647931427049905
+312.76289490947937,44.40076132666685
+313.76259600948583,44.18112215981157
+313.11680283929536,44.05861394172086
+313.56699484966947,44.40291592301878
+312.7287237613243,44.38283520549869
+313.5959319846104,44.3209265814808
+313.76662345958664,44.74070007403486
+312.83106326015115,44.325146090175686
+314.1945193774256,43.767239662532866
+314.5450978433306,43.885607658494436
+313.063094833578,43.502067898891696
+312.6557508284225,44.34805504775345
+312.916507636757,44.553945873148145
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+313.40262665227465,44.66467215720368
+312.63467375634264,44.43817851699804
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+313.68607457615644,44.52895151743057
+312.95230917862733,44.088782803535345
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+312.8072667450728,44.37366095322359
+313.09385664703177,44.23337851243401
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+312.9135525014715,44.40778696773347
+314.0487983814546,44.18196083626438
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+314.62700181220225,43.90262235999385
+313.0767383034075,44.27513466759154
+313.4077230134428,44.405784683179455
+312.80038267902404,44.313240837133534
+312.7737481103964,44.2756174992443
+313.00072099191436,44.333053725436564
+312.6678481482751,44.51358919827957
+313.0565416594131,43.677474814002274
+313.6900622847246,44.52697728864731
+312.70038599475987,44.56016414568739
+314.80322628703317,44.2741206966779
+313.5365549737283,44.503181058530046
+312.9884250111627,44.03779365337419
+312.60242541317564,44.92092749329559
+313.4822098612072,42.75857157120715
+312.7693628453087,44.3972432622505
+313.38076414721843,44.2262346869474
+314.53692232894724,43.783272613953606
+314.59855597445545,43.882055000647505
+312.8904299532222,44.17068994339685
+312.74588223129325,44.33173518582862
+312.7190342985914,44.27888878470984
+312.777638321121,44.361312210949386
+314.020203173375,44.58231171364184
+313.11151769035183,44.285138743533935
+312.81884032151413,44.3827735529161
+314.6652178869925,43.71918620169887
+312.8690904291109,44.2625428298529
+312.9531889678755,44.39470490406047
+313.30835291416764,44.216048994754495
+314.5254813603184,43.883630729713374
+312.8025823261458,44.31261411198452
+313.011144384048,44.45799695989046
+312.8624501704055,44.22094146912779
+312.922569534802,44.251955561685
+313.3967863782052,44.281289838825465
+312.7561119042319,44.259557343227584
+312.1369366609665,44.199896751032334
+312.7309994942258,44.2960874126181
+312.21539449689067,43.85037700947687
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diff --git a/doc/field_guide.md b/doc/field_guide.md
index 09a93f30..454b0c98 100644
--- a/doc/field_guide.md
+++ b/doc/field_guide.md
@@ -29,3 +29,6 @@ for more details on the taxonomy.
 
 ```{include} ./field_guide__lpv.md
 ```
+
+```{include} ./field_guide__yso.md
+```
diff --git a/doc/field_guide__yso.md b/doc/field_guide__yso.md
new file mode 100644
index 00000000..eed0941e
--- /dev/null
+++ b/doc/field_guide__yso.md
@@ -0,0 +1,76 @@
+## Young Stellar Objects (yso)
+
+Young stellar objects (YSOs) exhibit a wide range of variability types,
+with many subclasses depending on the dominant physics in the system.
+
+
+Some of the lightcurve possibilities for YSOs include:
+
+
+
+
+### Classification and numbers
+- Supertypes
+  - Variable
+- Subtypes
+  - simple sinusoidal
+  - quasi-periodic
+  - stochastic
+  - faders
+  - longterm drifters
+- Occurrence rate: common, about 10<sup>X</sup> expected in ZTF data
+
+
+### ZTF light curves
+![ZTF yso sinusoidal](data/yso_sinusoidal.png)
+![ZTF yso quasi-periodic](data/yso_quasi-periodic.png)
+![ZTF yso stochastic](data/yso_stochastic.png)
+![ZTF yso burster](data/yso_burster.png)
+![ZTF yso outburster](data/yso_outburster.png)
+![ZTF yso dipper](data/yso_dipper.png)
+![ZTF yso fader](data/yso_fader.png)
+![ZTF yso longterm-drifter](data/yso_longterm-drifter.png)
+
+#### Description
+YSOs are not smooth variables like pulsating (e.g. RR Lyr) or eclipsing (e.g. Algol or EA) classes.
+Instead, because the lightcurves are generally the result of several superposed physical effects,
+they can appear quite messy,  They thus may satisfy the criteria for two or even more of the lightcurve categories below.
+Yet one subclass often dominates.
+
+#### Light curve characteristics
+- simple sinusoidal periodicity
+ (caused by rotating star with cool or hot spots)
+
+- quasi-periodic behavior, which is a periodicity on which stochastic behavior is superposed
+(caused by accreting star with rotational modulation)
+
+- stochastics, appearing similar to a damped random walk, with time scales from hours to weeks and usually symmetric around a mean (caused by accreting star with accretion effects dominating rotation effects)
+
+- bursts, which are brightening episodes that can last from many hours to days or possibly weeks; they are longer than flares which decay within minutes to hours
+(caused by clumpy accretion, rather than smooth accretion, due to a build-up of material in the transition zone between the stellar magnetosphere and the disk);
+
+- outbursts, like the above, but much larger amplitudes of 2-5 mag and much longer durations of months to decades
+(caused by accretion events driven by instabilities in the magnetosphere/disk interaction region, or the inner disk);
+
+- dippers, which have timescales similar to bursts, but are fading events of a few percent to tens of percent, rather than brightening, and can last many hours to days
+(caused by dust in the magnetosphere/disk interaction region that can be co-rotating with the star, in which case the source could be called a quasi-periodic dipper);
+
+- faders, like the above, but much larger amplitudes of 2-5 mag and longer durations, of weeks to years
+(caused by dust that is somewhat further out in the disk and has rotated into the line of sight).
+
+- longterm drifting behavior over a significant fraction of the time series, with gradual dimming or brightening over months to years
+(caused by slowly evolving changes in extinction or accretion)
+
+#### Other characteristics and selection methods
+ - In addition to the variability characteristics described above, young stellar objects must reside
+above the main sequence, as they are still contracting and are not yet
+stable hydrogen burning objects on the main sequence.   The periodic objects
+typically lack disks, but the other variability classes typically have
+infrared excess (large WISE or 2MASS colors) that imply the presence of a disk.
+
+![HR diagram of YSO](data/hr__yso.png)
+
+![RA/Dec diagram of YSO](data/radec__yso.png)
+
+### References and further reading:
+-